JPH11332122A - Power storage type air conditioner and control method of power storage type air conditioner - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To ensure a large battery capacity of a storage battery by suppressing a temperature drop of the storage battery at the start of a discharge operation, and to increase the charging efficiency. A constant current control unit (27) for performing two-stage constant current control is provided. The constant current control unit (27) performs first-stage charging at a current rate of 3 to 5 hours until the voltage of the storage battery (11) becomes 2.35 to 2.45 V, and performs charging at a current of 10 to 20 hours. Stage charge is performed for 2 hours. The charge / discharge control unit (121) includes a storage unit (12
Referring to the start time of the discharge operation stored in 6), the constant current control unit (27) is controlled so that the second-stage charging ends at the start time. The heat generated during charging raises the temperature of the storage battery (11), and discharge is performed in a state where a large storage capacity is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power storage type air conditioner provided with a storage battery, and more particularly to a technique for efficiently using a storage battery.

[0002]

2. Description of the Related Art Conventionally, air conditioners have been disclosed in
As disclosed in Japanese Patent Application Publication No. 137,651, there is a device provided with a storage battery. This type of power storage type air conditioner
While a converter, a smoothing capacitor, an inverter, and a compressor motor are sequentially connected to a commercial power supply via a transformer, a storage battery is connected to the transformer via a rectifier circuit and a thyristor, and the storage battery is connected to a stage preceding the inverter. It is configured.

[0003] Normally, the commercial power is supplied from the commercial power source to the compressor motor. On the other hand, during a power peak when the power demand becomes maximum, for example, during the daytime in the middle of summer, secondary power is supplied from the storage battery to the compressor motor. Supply to suppress the use of commercial power.

[0004]

Generally, as the temperature of a storage battery decreases, the battery capacity decreases. For example, as disclosed in the “Latest Practical Secondary Battery” issued by Nikkan Kogyo Shimbun, a cathode-absorbing sealed stationary lead-acid battery has characteristics as shown in FIG. From FIG. 10, it is understood that the battery capacity decreases as the temperature decreases, and the capacity decrease at a low temperature increases as the rate of discharge increases.

[0005] By the way, the peak of the power consumption of the air conditioner in winter occurs at the start of the heating operation. Therefore, in winter, the secondary power of the storage battery is most needed when starting the heating operation, that is, in the morning when the ambient temperature is low.

Therefore, in order to level the peak of power consumption by the secondary power of the storage battery, the discharge operation must be started when the temperature of the storage battery is low, and the storage battery must be used in a state where the battery capacity is reduced. become. Therefore,
There was a problem that sufficient power could not be taken out of the storage battery. On the other hand, if the depth of discharge is forcibly increased in order to extract sufficient power, there is a problem that the life of the storage battery is shortened.

Further, depending on the driving conditions, a sufficient amount of discharge may not be performed in the daytime. In such a case, if the charging operation is performed as usual, the charging efficiency is significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress the temperature drop of a storage battery at the start of discharging operation, thereby ensuring a large capacity of the storage battery and charging the storage battery. The goal is to increase efficiency.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for starting a discharging operation in a state in which the temperature of a storage battery is increased by the residual heat of the charging operation. At the start or at the same time.

[0010] Specifically, the means taken by the first invention are:
A storage type air conditioner comprising a storage battery (11) and discharging secondary power charged in the storage battery (11) to an electric device (M1),
Storage means (126) storing the start time of the discharging operation; and the charging operation is terminated such that the charging operation is terminated a predetermined time before the start time or the start time stored in the storage means (126). And a control means (125) for execution.

According to the above-mentioned invention specific matter, at the end of the charging operation, the storage battery (11) generates heat and its temperature rises. As a result, a large battery capacity of the storage battery (11) is ensured. Since the charging operation ends at the start time of the discharge operation stored in the storage means (126) or a predetermined time before the start time, the discharge operation starts with the temperature of the storage battery (11) rising.
Therefore, a decrease in the capacity of the storage battery (11) during discharging is suppressed.

A second aspect of the present invention is the control device according to the first aspect, wherein the control means (125) includes a constant current control section (27) for executing multi-stage constant current charge control, and a start time of the discharge operation. Alternatively, the charge control unit (1) that controls the constant current control unit (27) so that the charge of the final stage ends a predetermined time before the start time.
21).

According to the above-mentioned invention specific matter, multi-stage constant-current charging control is executed, and the charging of the final stage ends at the start time of the discharge operation or a predetermined time before the start time. For this reason, since the discharging operation is started immediately after the end of the last-stage charging in which heat is easily generated and the temperature rises most, a decrease in the capacity of the storage battery (11) during discharging is effectively suppressed.

According to a third aspect of the present invention, in the second aspect of the present invention, the constant current control section (27) controls the current of the predetermined first current value until the voltage of the storage battery (11) becomes a predetermined voltage. A first-stage charge for charging, and a second charge smaller than the first current value.
A two-stage constant-current charging control including a second-stage charging in which charging is performed for a predetermined time with a current having a current value is executed, and a charging control unit (1
21) is to cause the constant current control unit (27) to execute the second-stage charging so that the second-stage charging ends at a start time of the discharge operation or a predetermined time before the start time. is there.

According to the above-mentioned invention specific matter, in the first-stage charging, charging is performed by a current having a relatively large first current value,
The voltage of the storage battery (11) rises to a predetermined voltage. Thereafter, in order to improve the charging efficiency, the second-stage charging is performed with a current having a relatively small second current value. The second-stage charging is performed for a predetermined time, and when the second-stage charging is completed, the discharging operation is started. Therefore, a decrease in the capacity of the storage battery (11) is suppressed.

According to a fourth aspect of the present invention, in the first aspect, the control means (125) includes a discharge amount detector (122) for detecting a discharge amount, and the discharge amount detector (122) , The time required for the charging operation is calculated based on the detected discharge amount, and the charging operation is controlled based on the calculated time.

According to the above-mentioned invention specifying matter, the discharge amount detection unit (1
By 22), the amount of electric power discharged from the storage battery (11) is detected. The control means (125) calculates the time required for the charging operation based on the detected amount of discharge. Then, the charging operation is controlled based on the calculated time, and the charging operation ends at a start time of the discharge operation or a predetermined time before the start time. Therefore,
Immediately after the end of the charging operation, the discharging operation starts, and the storage battery (1
The capacity reduction of 1) is suppressed.

According to a fifth aspect of the present invention, in the second aspect, the control means (125) includes a timer (120) for measuring a charging time of the first-stage charging. When the time is within a predetermined time, the charging of the second and subsequent stages is omitted.

According to the above-mentioned invention specific matter, the charging time of the first-stage charging is measured by the timer (120), and the control means (12
It is determined according to 5) whether or not the charging time is within a predetermined time. If the charging time is within a predetermined time, the storage battery (11)
Is determined to be sufficient, and the charging of the second and subsequent stages is omitted. As a result, useless charging of the second and lower stages with low efficiency is avoided, and charging efficiency is improved.

According to a sixth aspect of the present invention, in the second aspect, the control means (125) includes a discharge amount detection section (122) for detecting a discharge amount, and the charge control section (121) When the discharge amount detected by the discharge amount detection unit (122) is equal to or smaller than a predetermined value, the constant current control unit (27) is stopped to omit the charging operation.

According to the above-mentioned invention specifying matter, the discharge amount detection unit (1
When the detected discharge amount detected by (22) is equal to or less than a predetermined value,
It is determined that the discharging has not been performed, and the control operation of the constant current control unit (27) is stopped, and the charging operation is omitted. Therefore,
Useless charging operation is avoided, and charging efficiency is improved.

According to a seventh aspect of the present invention, in the second aspect, the control means (125) includes a discharge amount detection section (122) for detecting a discharge amount, and the charge control section (121) When the amount of discharge detected by the discharge amount detection unit (122) is equal to or less than a predetermined value, the constant current control unit (27) is controlled so as to execute only the last stage charging.

According to the above-mentioned invention specifying matter, the discharge amount detection unit (1
When the discharge amount detected by 22) is equal to or less than the predetermined value, the storage battery
It is determined that a considerable amount of power remains in (11), and only the last stage charging is performed. As a result, unnecessary multi-stage constant current control is avoided, and the charging efficiency is improved.

According to an eighth aspect of the present invention, a storage battery (11) is provided, and the secondary power charged in the storage battery (11) is supplied to an electric device (M1).
In the method for controlling a power storage type air conditioner, the charging operation is performed, and then the charging operation is ended at a start time of the discharge operation or a predetermined time before the start time.

According to the above-mentioned invention specific matter, at the end of the charging operation, the storage battery (11) generates heat and its temperature rises. As a result, a large battery capacity of the storage battery (11) is ensured. Since the charging operation ends at the start time of the discharging operation or a predetermined time before the starting time, the discharging operation starts with the temperature of the storage battery (11) rising. Therefore, a decrease in the capacity of the storage battery (11) during discharging is suppressed.

According to a ninth aspect of the present invention, in the above-mentioned eighth aspect, the multi-stage constant-current charging control is performed such that the final-stage charging is completed at a start time of the discharge operation or a predetermined time before the start time. It is to be executed.

According to the above-mentioned invention specific matter, multi-stage constant-current charging control is executed, and the final-stage charging ends at the start time of the discharge operation or a predetermined time before the start time. For this reason, since the discharging operation is started immediately after the end of the last-stage charging in which heat is easily generated and the temperature rises most, a decrease in the capacity of the storage battery (11) during discharging is effectively suppressed.

According to a tenth aspect, in the ninth aspect, the storage battery is operated by a current having a predetermined first current value.
The first-stage charging is performed until the voltage of (11) becomes a predetermined voltage,
After the first-stage charging, a second-stage charging is performed in which charging is performed for a predetermined time using a current having a second current value smaller than the first current value, and the second-stage charging is started at the discharge operation start time or the start time The processing ends before a predetermined time before the time.

According to the above-mentioned invention specific matter, in the first stage charging, charging is performed by a current having a relatively large first current value,
The voltage of the storage battery (11) rises to a predetermined voltage. Thereafter, in order to improve the charging efficiency, the second-stage charging is performed with a current having a relatively small second current value. The second-stage charging is performed for a predetermined time, and when the second-stage charging is completed, the discharging operation is started. Therefore, a decrease in the capacity of the storage battery (11) is suppressed.

According to an eleventh aspect of the present invention, in the eighth aspect, the discharge amount is detected, a time required for the charging operation is calculated based on the detected discharge amount, and the charging operation is performed based on the calculated time. Is to be terminated.

The amount of discharge of the storage battery (11) is detected based on the above-described specific matter of the invention, and the time required for the charging operation is calculated based on the detected amount of discharge. Then, the charging operation is controlled based on the calculated time, and the charging operation ends at a start time of the discharge operation or a predetermined time before the start time. Therefore, the discharge operation is started immediately after the end of the charge operation, and a decrease in the capacity of the storage battery (11) is suppressed.

According to a twelfth aspect, in the ninth aspect, when the charging time of the first-stage charging is within a predetermined time, the charging of the second and subsequent stages is omitted.

If the charging time of the first-stage charging is within a predetermined time, it is determined that the amount of charge of the storage battery (11) is sufficient, and the charging of the second and subsequent stages is omitted.
As a result, useless charging of the second and lower stages with low efficiency is avoided, and charging efficiency is improved.

According to a thirteenth aspect, in the ninth aspect, the discharge amount is detected, and the charging operation is omitted when the detected discharge amount is equal to or less than a predetermined value.

If the detected amount of discharge is equal to or less than the predetermined value, it is determined that the discharge has not been performed, and the charging operation is omitted. Therefore, useless charging operation is avoided, and charging efficiency is improved.

According to a fourteenth aspect of the present invention, in the ninth aspect of the present invention, the charging operation for detecting the amount of discharge and performing only the last-stage charging when the detected amount of discharge is equal to or less than a predetermined value. It was done.

When the detected amount of discharge is equal to or less than the predetermined value, it is determined that a considerable amount of power remains in the storage battery (11), and only the last stage charging is performed. As a result, unnecessary multi-stage constant current control is avoided, and the charging efficiency is improved.

[0038]

Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 2 and 3, the storage type air conditioner (10) according to the present embodiment has one outdoor unit (1A) and one indoor unit. This is a heat pump type air conditioner to which (1B) is connected. The power storage type air conditioner (10) includes a power storage unit (BM) containing a storage battery (11) for supplying secondary power to the compressor motor (M1) of the outdoor unit (1A).

The outdoor unit (1A) is of a package type, and although not shown, is a room formed by connecting a compressor, a four-way switching valve, an expansion valve, and an outdoor heat exchanger as a heat source side heat exchanger. An outer refrigerant circuit is accommodated. On the other hand, the indoor unit (1B) houses a refrigerant circuit on the indoor side including an indoor heat exchanger as a use-side heat exchanger. The outdoor unit (1A) and the indoor unit (1B) are connected by a communication pipe (1C) to form a refrigerant circuit. And
In the refrigerant circuit, the refrigerant circulation direction is reversible by the switching operation of the four-way switching valve, and the mode is switched between the cooling operation and the heating operation.

-Configuration of Electric Circuit- The power storage unit (BM) includes a power storage circuit (40), and this power storage circuit (40) is connected to a power supply line (20) as shown in FIG. In the power supply line (20), a commercial power supply (21) as a power supply and a breaker (22) are sequentially connected. The commercial power supply (21) supplies 200 V three-phase AC commercial power as primary power.

The power storage circuit (40) includes a power storage power line (41) connected to a power line (20) by a first terminal block (40A) disposed in a part of a casing of the power storage unit (BM). ing. The current transformer (CT),
Charging electromagnetic relay (42), power conversion circuit (43), storage battery (1
A DC current transformer (CT2) for detecting the current of 1) and a storage battery (11) are connected in order.

The current transformer (CT) is connected to a commercial power supply (2
Detects the input current from 1) and outputs the detected current value. The DC current transformer (CT2) detects a charging current of the storage battery (11) during charging, and detects a discharging current of the storage battery (11) during discharging, and outputs a current detection signal.

The charging electromagnetic relay (42) includes a storage battery (11)
Turned on when charging.

The power conversion circuit section (43) includes a charging AC / DC
The converter unit (44) and the DC / DC converter unit (45) are sequentially connected and configured. The AC / DC converter section (4
4) is a conversion circuit for converting AC commercial power to DC power and outputting the DC power, and includes a rectifier circuit (46), a choke coil (47), and a smoothing circuit (48). The rectifier circuit (46) is configured by a diode module having a diode. The choke coil (47) and the smoothing circuit (48) are for smoothing a DC voltage, and the smoothing circuit (48) includes a capacitor.

The DC / DC converter section (45) includes an IGBT (Insulate Gate Bipolar Transistor) and a diode for charging, and an IGBT and a diode for discharging. The DC / DC converter unit (45) reduces the DC power from the AC / DC converter unit (44) to DC power corresponding to the charging of the storage battery (11) while charging the storage battery (11). ), The power stored in the storage battery (11) is increased to DC power corresponding to the driving of the compressor motor (M1).

The storage battery (11) is composed of a sealed type granular lead battery, and both ends are connected to a DC / DC converter (45). The storage battery (11) is, for example, about 130 V when fully charged,
Approximately 98V at the end of discharge, secondary power is supplied to compressor motor
(M1) constitutes a secondary power supply. Then, the storage battery (11) is charged by receiving power from the commercial power supply (21) from the AC / DC converter (44) and the DC / DC converter (45).

A second terminal block (40B) is provided in a part of the casing of the power storage unit (BM). A branch power supply line (49) branched from the power storage power supply line (41) is connected to the second terminal block (40B). The branch position of the branch power supply line (49) is on the downstream side of the current transformer (CT) and on the upstream side of the charging electromagnetic relay (42).

The power storage unit (BM) houses a charge / discharge controller (70). This charge / discharge controller
(70) is a controller for controlling charging or discharging of the storage battery (11). The charge / discharge controller (70) includes a current detection circuit (26) connected to the DC current transformer (CT2), a voltage detection circuit (28) for detecting the voltage of the storage battery (11), and a timer (12).
0), a CPU (71) and a converter drive circuit (72). The CPU (71) includes a charge / discharge control unit (121) constituting a charge control unit, and a constant current control unit (2
7) and a storage unit (126) for storing the start time of the discharge operation.

As shown in FIG. 4, the current detection circuit (26)
A reference voltage generation circuit (203) including a plurality of reference voltage changeover switches (Q1 to Q5) and reference voltage setting resistors (R1 to R7), and an operational amplifier (202) are provided. That is, in the present embodiment, since multiple stages of constant current control are executed, a plurality of reference voltages are set to be switchable. Constant current control unit (27)
Includes an A / D conversion unit (207), a control output unit (208), a reference voltage storage unit (205), and a reference voltage switching unit (206). The reference voltage storage unit (205) selects a predetermined reference voltage from the reference voltage table stored in advance according to the operation state, and outputs the reference voltage value to the reference voltage switching unit (206). The reference voltage switching unit (206) outputs a select signal to a circuit of the reference voltage generation circuit (203) corresponding to the reference voltage value, and supplies a reference voltage to the operational amplifier (202). The operational amplifier (202) compares the current detection signal of the DC current transformer (CT2) with the reference voltage, amplifies the difference, and outputs an A / A signal as an error signal.
Output to the D conversion unit (207). The A / D converter (207) converts the erroneous signal into a digital signal and outputs the digital signal to the control output unit (208). The control output section (208) stores the error signal and the reference voltage storage section (20
A drive control signal is output to the converter drive circuit (72) based on the reference voltage received from 5).

As shown in FIG. 3, the converter drive circuit (72) operates based on the drive control signal to store the storage battery (1).
DC / D so that the charge current or discharge current of 1) becomes a predetermined value.
The C converter (45) is controlled. That is, the DC / DC converter unit (45) adjusts the charging current or the discharging current flowing through the storage battery (11) so as to have a predetermined value.

The voltage detection circuit (28) is a circuit for detecting the voltage of the storage battery (11). As shown in FIG.
(28) is constituted by an insulating amplifier (200).

The charge / discharge control section (121) is a control section for controlling the charge operation and the discharge operation, and receives signals from the timer (120) and the voltage detection circuit (28) as shown in FIG. The charging operation control and the like are performed.

Next, the electric circuit of the outdoor unit (1A) will be described. This outdoor unit (1A) includes a motor drive circuit (30). The motor drive circuit (30) includes a main power supply line (31) connected to a power supply terminal block (30A) provided in a part of a casing of the outdoor unit (1A). To the main power supply line (31), an electromagnetic relay (32) and an AC / DC converter section (34) similar to the above-described power storage circuit (40) are sequentially connected.

The rectifier circuit (3) of the AC / DC converter section (34)
6), the choke coil (37) and the smoothing circuit (38) are the same as those of the power storage circuit (40) described above. Therefore, the description is omitted here.

An inverter section (35) is provided at the subsequent stage of the converter section (34). The inverter unit (35) is a conversion circuit that converts DC power output from the converter unit (34) into predetermined AC power and supplies the AC power to the compressor motor (M1), and employs a pulse width modulation method. IGBT (Insulate
It consists of a transistor module equipped with a switching element such as a gate bipolar transistor (Gate Bipolar Transistor).

The compressor motor (M1) is connected to the inverter (3
This is a load that drives the compressor by receiving the control power output from 5), and the number of revolutions is controlled to adjust the capacity of the compressor.

The outdoor unit (1A) houses an outdoor controller (80). This outdoor controller (80)
Has an inverter drive circuit (82). The inverter drive circuit (82) drives the inverter (35) based on a drive control signal from the CPU (81). That is,
The inverter (35) outputs control power, which is AC power of a predetermined frequency, based on a drive signal of the inverter drive circuit (82).

The second terminal block (40B) of the power storage circuit (40) and the power supply terminal block (30A) of the motor drive circuit (30) configured as described above.
And are connected by a communication power line (90). That is,
The outdoor unit (1A) is configured to be supplied with power via a power storage unit (BM). Further, since the current transformer (CT) is located at a stage prior to the branch power supply line (49), the current transformer (CT) detects the total current supplied to the power storage circuit (40) and the motor drive circuit (30).

Further, a power storage circuit (40) and a motor drive circuit (30)
Are connected by a secondary power supply line (50). The secondary power supply line (50) connects the power storage circuit (40) and the smoothing circuits (48, 38) of the motor drive circuit (30) with each other, and includes a discharge electromagnetic relay (51). The discharge electromagnetic relay (51) turns on when the storage battery (11) is discharged. That is, the power stored in the storage battery (11) by the ON operation of the discharge electromagnetic relay (51) is compressed via the DC / DC converter (45), the secondary power supply line (50), and the inverter (35). Machine motor (M1).

Next, control means for controlling each device of the motor drive circuit (30) and the power storage circuit (40) will be described.

The CPU (81) of the outdoor controller (80) is provided with an air conditioning controller (83).
(83) controls the air conditioning operation. That is, the air-conditioning controller (83) includes detection signals from various sensors (not shown) provided in various parts such as a refrigerant circuit for detecting an operation state, an operation signal from the remote controller (14), a stop signal, and a set temperature. Signal is input. And the air conditioning controller
(83) turns on / off the electromagnetic relay (32) based on the detection signal, the operation signal, the stop signal, and the set temperature signal, and outputs a drive control signal to the inverter drive circuit (82) to output the compressor control signal. It controls the number of rotations of the motor (M1), and further controls the opening degree of the expansion valve and the fans provided in the indoor and outdoor units to control the air conditioning operation.

On the other hand, the CPU (7) of the charge / discharge controller (70)
1) includes not only the constant current control unit (27) and the charge / discharge control unit (121), but also includes a voltage command unit and a converter control unit (not shown), and an operation signal and a stop signal from the remote control (14). On / off switching of each electromagnetic relay (42, 51), control of the DC / DC converter unit (45), and the like are performed based on the.

When discharging from the storage battery (11), the voltage command section sets a voltage value corresponding to the drive of the compressor motor (M1),
For example, while outputting 300 V as a voltage command value, when charging the storage battery (11), a voltage command value corresponding to charging of the storage battery (11) is output.

The converter control section receives the detected current value of the current transformer (CT) and the voltage command value of the voltage command section, and drives the converter drive circuit (72) based on the detected current value and the voltage command value. Outputs control signal. Especially,
The converter control unit supports a boosting operation of boosting the DC power voltage output from the DC / DC converter unit (45) to a voltage corresponding to the driving of the compressor motor (M1) and charging of the storage battery (11). A drive control signal is output to converter drive circuit (72) so as to switch from the step-down operation of stepping down to the set voltage.

The converter drive circuit (72) receives the drive control signal of the converter control unit, outputs a drive signal to the DC / DC converter unit (45), and outputs the drive power voltage of the DC / DC converter unit (45). DC / D so that
The switching element of the C converter section (45) is on / off controlled.

-Operating Operation- Next, the operating operation of the above-described power storage type air conditioner (10) will be described. <Normal Operation> First, the operation of the normal operation for performing the air-conditioning operation by receiving the commercial power from the commercial power supply (21) will be described. When an operation signal is input from the remote control (14), the operation signal is transmitted to each controller (70, 80), and the air conditioning controller (8
3) turns on the electromagnetic relay (32) of the motor drive circuit (30).
The charging / discharging controller (70) is provided with a charging electromagnetic relay (4
Turn off both 2) and the discharge electromagnetic relay (51). When the electromagnetic relay (32) is turned on, commercial power is supplied to the converter (3).
The DC power is input to the rectifier circuit (36) of (4), converted into DC power, and smoothed by the smoothing circuit (38), and the DC power is input to the inverter unit (35).

The air conditioning controller (83) derives the required air conditioning load based on the detection values of various sensors provided in the refrigerant circuit and the like and the temperature set value from the remote controller (14), and derives the derived air conditioning load. The expansion valve opening and the fan speed are controlled so that the air conditioning capacity that satisfies the air conditioning load is exhibited. Further, the air conditioning controller (83) outputs a rotational speed command value of the compressor motor (M1) to the inverter drive circuit (82) as a drive control signal. Inverter drive circuit (82)
Receives the rotation speed command value from the air conditioning controller (83) and outputs a control signal to the inverter unit (35) so that the rotation speed of the compressor motor (M1) becomes the rotation speed command value. Then, the inverter unit (35) outputs predetermined AC control power by the switching element of the inverter unit (35) being turned on and off by the control signal, whereby
The rotation speed of the compressor motor (M1) is controlled to be the above rotation speed command value.

<Discharge Operation> Next, the operation of the discharge operation for performing the air conditioning operation by receiving the secondary power of the storage battery (11) will be described.

When an operation signal is input from the remote controller (14), the operation signal is transmitted to each of the controllers (70, 80), and the charge / discharge controller (70) operates to discharge the electromagnetic relay for discharging the secondary power line (50). Turn on (51). This electromagnetic relay for discharge (51)
As a result, the secondary power of the storage battery (11), which is DC power, is boosted by the DC / DC converter (45) and then input to the inverter (35) via the secondary power supply line (50). A voltage value corresponding to driving of the compressor motor (M1), for example, 300 V DC power is input to the inverter unit (35). The current value of the DC power input to the inverter (35) is controlled to a predetermined reference current value by constant current control described later. The reference current value is switched according to the load of the compressor motor (M1). The operation of the air conditioning controller (83)
This is the same as in the case of the normal operation.

Then, the so-called peak cut operation is performed by switching between the normal operation and the discharge operation based on a preset schedule. The switching between the normal operation and the discharge operation is performed by the storage battery.
It may be performed based on the voltage of (11), and the remote control (1
It may be forcibly performed according to the instruction from 4).

<Charging operation> In the morning or daytime, the normal operation or the discharging operation is performed, whereas in the nighttime, a stop signal is generally input from the remote control (14) to stop the air conditioning operation. , The charging operation of the storage battery (11) is performed. That is, the air conditioning controller (83) turns off the electromagnetic relay (32) of the motor drive circuit (30),
Cut off the supply of control power to the compressor motor (M1). On the other hand, the charge / discharge controller (70) turns on the charging electromagnetic relay (42) of the power storage circuit (40) and turns off the discharging electromagnetic relay (51) of the secondary power supply line (50).

At this time, the voltage command section of the charge / discharge controller (70) outputs a voltage command value corresponding to the charging of the storage battery (11), while the current transformer ( CT) and the voltage command value of the voltage command section are input. Then, the converter control unit outputs a drive control signal to the converter drive circuit (72) based on the detected current value and the voltage command value, and the converter drive circuit (72) outputs the DC / DC converter unit (45) The on / off control of the switching element is performed so that the voltage of the output power becomes the voltage command value, and the 200 V commercial power is reduced. After that, the reduced DC power is
The battery (11) is supplied to (11) to charge the storage battery (11). At this time, constant current control is performed, and a current having a predetermined reference current value flows through the storage battery (11).

-Charge / Discharge Control- Next, charge / discharge control which is a feature of the present embodiment will be described.

In the present embodiment, a so-called multi-stage constant current charging method in which the current during charging is gradually reduced to two stages is used. Specifically, in the first-stage charging at the start of charging, the battery is charged with a current having a first current value at a rate of 3 to 5 hours until the voltage of the storage battery (11) becomes about 2.35 V to 2.45 V. I do. The second-stage charging is performed for a predetermined period of time using a current having a second current value at a rate of 10 to 20 hours. In the present embodiment, the second-stage charging is performed for 2 hours.

The reason for employing such a multi-stage constant current charging method is as follows. That is, if charging is continued for a long time with a large current in the first stage, gas is generated in the storage battery (11), and charging efficiency is reduced. On the other hand, when charging is performed with a small current, a considerable time is required until the battery is fully charged. Therefore, charging is performed with a relatively large current until the voltage of the storage battery (11) increases and the charging efficiency decreases, while the storage battery (11) is charged.
After the voltage of (11) rises to a predetermined value, charging is performed with a relatively small current. Dividing the charging into multiple stages in this manner enables efficient charging. Therefore, electric power is used effectively, and the charging time is shortened.

However, even in the second-stage charging, when the voltage of the storage battery (11) becomes close to the full charge, the efficiency is reduced and the storage battery (11) generates heat. As a result, the temperature of the storage battery (11) rises.

The temperature change that occurs when the battery is charged is caused by Joule heat and heat generated by a reversible cause. Regarding Joule heat, if the internal resistance of the battery is r [Ω] and the current flowing in the battery is I [A], 860 Ir per 1 Ah
[cal]. On the other hand, heat generation due to a reversible cause is 1A.
It is about 70 [cal] per h. In the case of charging, both heats are applied and the temperature rises.

Therefore, in the present invention, the phenomenon of temperature rise accompanying the charging of the storage battery (11) is used to increase the battery capacity. For example, as shown in FIG.
If the temperature of the storage battery (11) increases by about 5 ° C., the capacity of the storage battery (11) increases by about 5 to 10%.

Specifically, the charging control is executed according to the flowchart of FIG. First, in step ST1, the charge / discharge control unit (121) refers to the timer (120) and determines whether the time t has reached the charge start time t1. As a result, when the time t becomes the charging start time t1, the process proceeds to step ST2 to execute the first-stage charging. The first-stage charging is performed until the voltage of the storage battery (11) reaches a predetermined voltage of about 2.35V to 2.45V. When the voltage detected by the voltage detection circuit (28) reaches the predetermined voltage, the charge / discharge control unit (121) terminates the first-stage charging.

When the first-stage charging is completed, step ST3
The charge / discharge control unit (121) determines whether the charging time of the first-stage charging is equal to or shorter than a predetermined time T. The predetermined time T is a time serving as a reference for determining whether or not the second-stage charging is necessary,
In this embodiment, it is set to one minute. That is, if the charging time of the first-stage charging is equal to or less than the predetermined time T, it is determined that sufficient power has been accumulated in the storage battery (11) from before the charging, and that it is not necessary to recharge. The second-stage charging is omitted, and the process proceeds to step ST7 described below.

On the other hand, if it is determined in step ST3 that the charging time of the first-stage charging is longer than the predetermined time T, the process proceeds to step ST4. In step ST4, the charge / discharge control unit (121) sets the start time of the second-stage charging. In the present embodiment, the second-stage charging is performed for a predetermined time T2.
The discharge start time is set to time t3. Therefore, the start time t2 of the second-stage charging is t2 = t3-T
It is calculated as 2. For example, the discharge start time is 8:00, 2
Assuming that the charging time of the second-stage charging is 2 hours, the start time of the second-stage charging is set at 6:00.

Next, proceeding to step ST5, the charge / discharge control unit (121) determines whether or not the time t is the start time t2 of the second-stage charging while referring to the timer (120). When the time t reaches the second-stage charging start time t2, the process proceeds to step ST6,
Execute the second-stage charging.

When the second-stage charging is completed, the process proceeds to step ST7, where discharging is started immediately.

As a result, for example, when the charging start time t1 is 2
, The charge time T2 of the second stage is 2 hours, and the discharge start time t
If 3 is 8:00, a charging operation and a discharging operation as shown in FIG. 7A are executed.

According to the present embodiment, the second-stage charging is performed such that the second-stage charging is completed at the start of the discharging operation.
The discharge operation can be started in a state where the temperature of the storage battery (11) has risen due to the residual heat. Therefore, a large battery capacity of the storage battery (11) can be secured. As a result, storage batteries
Power can be efficiently extracted from (11). Also,
There is no need to forcibly increase the depth of discharge, and the life of the storage battery (11) can be extended. Therefore, even in a case where the secondary power of the storage battery (11) is used early in the morning in cold regions such as Tohoku and Hokkaido, sufficient discharge power can be secured.

The storage battery (1) is based on the charging time of the first-stage charging.
Since the amount of power stored in 1) is estimated and the second-stage charging is not performed when sufficient power is stored in the storage battery (11), unnecessary multi-stage charging can be avoided, The charging efficiency of the battery can be improved.

-Modification of Embodiment-In the above embodiment, the start time of the discharge operation and the end time of the charge operation are matched, but the charge operation is terminated a predetermined time before the start time of the discharge operation. You may make it do. In other words, the start time of the discharge operation and the end time of the charge operation do not need to be completely coincident with each other. May have a time difference.

In the above embodiment, while the storage battery (11) is charged at night, the storage battery (1) is charged at a predetermined time in the morning or daytime.
1) The air-conditioning operation is performed only by receiving the secondary power from the so-called peak-cut operation.In addition to this, the storage battery (11) is charged at night and the predetermined time in the morning or daytime. In the belt, the commercial power of the commercial power supply (21) and the storage battery
A so-called peak shift operation may be performed in which the air conditioning operation is performed by receiving both of the secondary power from (11).

[0090]

[Embodiment 2] In this embodiment, the first-stage and second-stage charging are performed continuously, and the charging time of the first-stage charging is predicted from the amount of discharged power on the previous day, and then the next morning. The start time of the first-stage charge is set so that the second-stage charge ends at the discharge start time of the second stage.

As shown in FIG. 8, in the present embodiment, the charge / discharge controller (70) includes a discharge amount detection unit (122) for detecting a discharge power amount of the storage battery (11). The discharge amount detection unit (122) includes a current detection circuit (26), a voltage detection circuit (28)
And a charge / discharge control unit (121).

Referring to FIG. 9, the charging control according to the present embodiment will be described. First, in step ST11, the charge / discharge control unit (121) receives the discharge amount detected by the discharge amount detection unit (122), and determines whether or not the previous day's discharge amount, that is, the previous day's discharge power amount is zero. If the previous day's discharge amount is zero, charging is not performed, and the process proceeds to step ST19. When the time reaches the discharge start time t3, the discharge in step ST20 is started. On the other hand, if the previous day's discharge amount is not zero, step ST1
Proceed to 2.

In step ST12, the charge / discharge control unit (12
In 1), in order to determine whether the first-stage charging is necessary, it is determined whether or not the previous day's discharge amount is equal to or less than a predetermined value. In this embodiment, the predetermined value is set to a value of 10% of the power at the time of full charge. If the previous day's discharge amount is equal to or less than the predetermined value, the process proceeds to steps after step ST17, and the first-stage charging is omitted. On the other hand, when the previous day's discharge amount is larger than the predetermined value, the process proceeds to step ST13.

In step ST13, the charge / discharge control unit (12
1) predicts the charging time T1 of the first-stage charging based on the amount of discharge the day before. For example, the prediction of the charging time T1 may be made in advance by formulating or tabulating the charging time T1 with a function for the previous day's discharge amount, and calculating based on these formulas or tables.

Then, the process proceeds to step ST14 to set the start time t1 of the first-stage charging. The start time t1 is set by t1 = t3-T1-T2 where the discharge start time is t3 and the charging time of the second-stage charging is T2.

Next, the process proceeds to step ST15, where the time is 1
It is determined whether or not the start time t1 of the first-stage charging has come. When the start time t1 has come, the process proceeds to step ST16 to execute the first-stage charging.

Next, the process proceeds to step ST17, where the time is 2
It is determined whether or not the start time t2 of the second-stage charging has come. When the start time t2 has come, the process proceeds to step ST18 to execute the second-stage charging.

Thereafter, the process proceeds to step ST20 to start the discharge operation. When the discharge operation in step ST20 ends, the process proceeds to step ST21, where the discharge amount detection unit (122) detects the discharge amount in step ST20. This discharge amount is stored in the discharge amount detection unit (122) as the previous day's discharge amount, and is appropriately referred to by the charge / discharge control unit (121).

As a result, for example, assuming that the charging time T1 of the first-stage charging is 3 hours, the charging time T2 of the second-stage charging is 2 hours, and the discharge start time t3 is 8:00, FIG. The charging operation and the discharging operation as shown are performed.

-Effects of this embodiment- Also in this embodiment, when the discharge amount on the previous day is not zero, 2
Since the second-stage charging is performed so that the first-stage charging is completed, the discharging operation can be started in a state where the temperature of the storage battery (11) has increased. Therefore, the same effect as in the first embodiment can be obtained.

On the other hand, if the discharge amount on the previous day is zero, no charging is performed, so that useless charging can be avoided. In addition, when the amount of discharge on the previous day is small, the first-stage charging is omitted, so that useless multi-stage charging can be avoided, and the charging efficiency of the battery can be improved.

The reference of the discharge amount for determining whether or not the discharge has been performed on the previous day is not limited to zero, and it is needless to say that the determination may be based on a predetermined value close to zero.

[0103]

As described above, according to the first or eighth aspect of the present invention, the discharging operation is started at the end of the charging operation or a predetermined time after the end of the charging operation. Driving can be performed. Therefore, a large battery capacity of the storage battery can be secured.

According to the second or ninth aspect, multi-stage constant-current charging control is performed to make the end time of the last-stage charging in which the temperature rise of the storage battery is large coincide with or almost coincide with the start time of the discharging operation. Therefore, it is possible to increase the charging efficiency of the storage battery and at the same time to secure a large battery capacity.

According to the third or tenth aspect, the first-stage charging is performed until the voltage of the storage battery reaches the predetermined voltage,
Since the two-stage constant-current charging control for performing the second-stage charging for a predetermined time is performed, it is easy to match the end of the charging operation with the discharge start time.

According to the fourth or eleventh aspect, the time required for charging is calculated based on the detected amount of discharge, and then the charging operation is controlled. It is easy to match with.

According to the fifth or twelfth aspect, the charge of the second and subsequent stages can be omitted based on the charge time of the first-stage charge, so that unnecessary charge can be avoided.
It is possible to improve the charging efficiency.

According to the sixth or thirteenth aspect, when the detected discharge amount is equal to or less than the predetermined value, the charging operation is omitted, so that useless charging operation can be avoided.
It is possible to improve the charging efficiency.

According to the seventh or fourteenth aspects, only the final stage charging can be executed based on the detected amount of discharge, so that charging at a low efficiency stage can be avoided, and the charging efficiency can be reduced. It can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is an overall configuration diagram of a power storage type air conditioner.

FIG. 3 is an electric circuit diagram of a power storage type air conditioner.

FIG. 4 is a circuit diagram of a constant current control circuit.

FIG. 5 is a circuit diagram of a voltage detection circuit.

FIG. 6 is a flowchart of charge / discharge control according to the first embodiment.

FIG. 7A is a time chart illustrating an operation example of the first embodiment, and FIG. 7B is a time chart illustrating an operation example of the second embodiment.

FIG. 8 is a control circuit diagram according to a second embodiment.

FIG. 9 is a flowchart of charge / discharge control according to the second embodiment.

FIG. 10 is a diagram showing temperature dependence of battery capacity.

[Explanation of symbols]

 (11) Storage battery (21) Commercial power supply (26) Current detection circuit (27) Constant current control unit (28) Voltage detection circuit (120) Timer (121) Charge / discharge control unit (122) Discharge amount detection unit (126) Storage Part (BM) Storage unit (M1) Compressor motor

Claims (14)

[Claims] 1. A storage type air conditioner comprising a storage battery (11) and discharging secondary power charged in the storage battery (11) to an electric device (M1), wherein a storage means for storing a start time of a discharging operation. 126), and control means (125) for executing the charging operation so as to end the charging operation at the start time stored in the storage means (126) or a predetermined time before the start time. A power storage type air conditioner, comprising: 2. The power storage type air conditioner according to claim 1, wherein the control means (125) includes a constant current control unit (27) for executing a multi-stage constant current charge control, and a start time of the discharge operation or a time at which the discharge operation starts. A power storage type air conditioner, comprising: a charge control unit (121) that controls the constant current control unit (27) so that charging at the final stage ends a predetermined time before a start time. 3. The storage-type air conditioner according to claim 2, wherein the constant current control unit (27) charges the battery with a current having a predetermined first current value until the voltage of the storage battery (11) becomes a predetermined voltage. A second-stage constant-current charge control including a first-stage charge to be performed and a second-stage charge to perform charging for a predetermined time with a current having a second current value smaller than the first current value is executed. ) Causes the constant-current control unit (27) to execute the second-stage charging so that the second-stage charging ends at a start time of the discharge operation or a predetermined time before the start time. Type air conditioner. 4. The storage type air conditioner according to claim 1, wherein the control means (125) detects a discharge amount (122).
A power storage type air conditioner, comprising: calculating a time required for a charging operation based on the amount of discharge detected by the discharge amount detection unit (122); and controlling the charging operation based on the calculated time. 5. The storage-type air conditioner according to claim 2, wherein the control means (125) includes a timer (120) for measuring a charging time of the first-stage charging. A power storage type air conditioner characterized by omitting the charging of the second and subsequent stages when within a predetermined time. 6. The storage type air conditioner according to claim 2, wherein the control means (125) detects a discharge amount (122).
The charge control unit (121) is characterized in that when the detected discharge amount of the discharge amount detection unit (122) is equal to or less than a predetermined value, the constant current control unit (27) is stopped to omit the charging operation. Storage air conditioner. 7. The storage type air conditioner according to claim 2, wherein the control means (125) detects a discharge amount (122).
The charge control unit (121) controls the constant current control unit (27) so that only the last stage charge is performed when the detected discharge amount of the discharge amount detection unit (122) is equal to or less than a predetermined value. A power storage type air conditioner characterized by the above-mentioned. 8. A method for controlling a power storage type air conditioner, comprising a storage battery (11), and discharging secondary power charged in the storage battery (11) to an electric device (M1). A method for controlling a power storage type air conditioner, wherein the charging operation is ended at a start time of the discharge operation or a predetermined time before the start time. 9. The control method for a power storage type air conditioner according to claim 8, wherein the multi-stage constant current charging control is performed such that the final stage charging ends at a start time of the discharge operation or a predetermined time before the start time. A method for controlling a power storage type air conditioner, comprising: 10. The control method for a power storage type air conditioner according to claim 9, wherein the first-stage charging is performed by a current having a predetermined first current value until the voltage of the storage battery (11) becomes a predetermined voltage; After the first-stage charging, a second-stage charging is performed in which charging is performed for a predetermined time using a current having a second current value smaller than the first current value, and the second-stage charging is started at the discharge operation start time or the start time. A method for controlling a power storage type air conditioner, wherein the method ends before a predetermined time before a time. 11. The control method for a power storage type air conditioner according to claim 8, wherein a discharge amount is detected, a time required for a charging operation is calculated based on the detected discharge amount, and charging is performed based on the calculated time. A method for controlling a power storage type air conditioner, comprising ending the operation. 12. The energy storage type air conditioner control method according to claim 9, wherein when the charging time of the first-stage charging is within a predetermined time, the charging of the second and subsequent stages is omitted. A method for controlling an air conditioner. 13. The storage-type air conditioner control method according to claim 9, wherein a discharge amount is detected, and the charging operation is omitted when the detected discharge amount is equal to or less than a predetermined value. Harmonic device control method. 14. The method for controlling a power storage type air conditioner according to claim 9, wherein a charge operation for detecting only a discharge amount and performing only charging in a final stage when the detected discharge amount is equal to or less than a predetermined value is performed. A method for controlling a power storage type air conditioner, comprising: