JPS60202065A - elevator control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a variable voltage/variable frequency control system (hereinafter referred to as VVV
This invention relates to an elevator control device that controls a plurality of elevators in an elevator (referred to as the F control method), and particularly relates to an improvement in the processing method of regenerated power during operation of an emergency generator.

[Prior art]

FIG. 1 shows a conventional elevator control system of this type, which controls three elevators as part of the system. In FIG. 1, 1 is a three-phase AC power supply, 2 is a power failure detection relay energized by the three-phase AC power supply 1,
Its normally open contact 2A is the load connection line L of the three-phase AC power supply 1.
connected in series. 3 is diesel engine E-G
and a generator G (11), and the load connection line of this emergency generator 3 is connected to the power failure detection relay 2.
normally closed contacts 2B are connected in series. Reference numeral 4 denotes a converter for power supply consisting of a diode connected to a three-phase bridge, and its input side is connected to the three-phase AC power supply 1 or the emergency generator 3 through contacts 2 or 2B, and its DC Smoothing capacitors 71 to 7 are connected to the output end via switches 61 to 63 corresponding to the axle 5 and three elevators.
5 are connected in parallel, and the smoothed DC output is sent to inverters 81 to 83 consisting of bridge-configured transistors and diodes connected in parallel to each transistor.
can be added to. The above inverter 81~
83 uses pulse width modulation (PWM) to generate any variable voltage.
A variable frequency three-phase alternating current is output, and each of these alternating current outputs is connected to the induction motor 10 of each elevator via normally open contacts 91 to 95.
1 to 105.

Reference numeral 11 denotes a regenerative converter formed by connecting a thyristor to a bridge, whose input side is connected to the DC side of the power running converter 4, and whose output side is connected to the AC power line L via a step-up transformer 12. There is. Reference numeral 13 denotes a regenerative power consumption circuit connected to the AC power line L, which is composed of a thyristor 13A, a resistor 13B, and a diode 13C.

Reference numerals 141 to 145 denote sheaves that are driven separately by the induction motors 101 to 105, respectively.
The main ropes 151 to 153 are wound around the main ropes 151 to 153, respectively, and the rain hanging ends of these main ropes 151 to 155 are each wrapped with a car 1.
61-165 and counterweights 111-175 are suspended. Further, the rotational speed of each of the induction motors 101-105 is detected by separate encoders 181-185. 191-195 are electromagnetic brakes, 2
0 is a sensor that detects DC voltage, 21 is a microcomputer that controls the regeneration converter 11, and
PU21a, RAM21b, ROM21c
and an interface 21d, and the detection signal of the sensor 20 is supplied to the microcomputer 21. 221 to 225 are microcomputers for controlling the above-mentioned elevator inverters 81 to 85; these microcomputers 22
1 to 223 are CPU and RAM.

It is composed of a ROM and an interface I/F, and speed signals detected by the corresponding encoders 181 to 185 are input to each of them.

In the conventional elevator control device configured as described above, when the three-phase AC power supply 1 is normal, the relay 2 is energized, its two normally open contacts are closed, and its normally closed contact 2B is open. . For this reason, the elevator induction motors 101 to 10
5, during power running, the three-phase voltage from the three-phase AC power supply 1 is full-wave rectified by the converter 4, and is further rectified by each capacitor 71 to
After smoothing by 75, each inverter 81
~B5 to each microcomputer 211~213ic
j j+ Pulse width modulation control is performed to convert the voltage and frequency into alternating current that changes along the speed pattern, and by applying this to each of the induction motors 101 to 105, each induction motor 101 to 103 is driven.

On the other hand, when the three elevators are operated regeneratively as a whole, the thyristor of the converter 11 is ignited by a signal from the microcomputer 21 to extract regenerative power from the induction motors 101 to 10. is returned to the AC power supply 1 side through the step-up transformer 12. At this time, if the reactance of the reactor 5 is sufficiently large, the power returned to the AC power supply side will be a square wave with 120° conduction. Further, since the thyristor 13A is not fired, the regenerated power is not consumed by the consumption circuit 13.

Next, a case will be described in which the AC power supply 1 fails for some reason and power is supplied to the elevator motor from the emergency generator 3.

In this case, the power failure detection relay 2 is deenergized, so the two normally open contacts are open and the normally closed contact 2B is closed.
1 Usually, in such cases, one or two elevators in the group
Only one elevator is in operation. Here, it is assumed that the elevator of No. 2 is operated.

Therefore, when the elevator induction motor 1020 is running, the power from the emergency generator 3 is full-wave rectified by the converter 4 as in the case of the AC power supply 1, and the inverter 82 is further pulse width modulated by the microcomputer 222. By controlling it, it is converted into alternating current of variable voltage and variable frequency and supplied to the induction motor 102.

Additionally, the capacity of the emergency generator 3 of an elevator is generally very small, so if the emergency generator 3 absorbs the regenerated power, the capacity of the emergency generator 3 must be increased. . That is, the regenerated power must be consumed by the friction of the driving engine E of the emergency generator 3, but since the friction of the engine is small, the engine must be large in order to absorb the regenerated power.

Therefore, conventionally, as shown in FIG. 1, a regenerative power consumption circuit 13 is provided to absorb the regenerated power. In this case, the thyristor 13A may be used simply as a switch, or the phase may be controlled in conjunction with the firing of the thyristor of the regenerative converter 11.

However, in the conventional circuit system as shown in FIG. 1, the thyristor constituting the regenerative converter 11 is phase-controlled, so when the thyristor commutates, the p angle that is heavy during commutation is shifted, and a sharp voltage notch appears. . If this voltage notch exists, the ignition circuit for boosting and excitation of the emergency generator may malfunction, and the output voltage of the generator may become unstable. For this reason,
In order to reduce the voltage notch, it is necessary to make the emergency generator larger.

Furthermore, since the regenerative power consumption circuit 13 is provided on the three-phase AC side of the VVVF inverter, at least three thyristors, three diodes, and three resistors are required, which increases the number of circuit components. There were drawbacks.

[Summary of the invention]

This invention solves the above conventional problems by blocking the regenerative converter when the emergency generator is operating the elevator, and by consuming the regenerative power using the inactive unit Ω inverter, thereby reducing the voltage notch. prevent the occurrence of
Another object of the present invention is to provide an elevator control device that can reduce the capacity of an emergency generator and reduce the number of components of a regenerative power consumption circuit.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention shown in the drawings will be described.

FIG. 2 shows an example of an elevator control system according to the present invention, in which the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted, and the parts different from FIG. 1 will be explained.

I will focus on the following. For convenience of explanation, the induction motor 10
．． A case will be described in which the No. 1 machine with the induction motor 102 is set as the idle machine and the No. 2 machine with the induction motor 102 is set as the operating machine.

That is, in order to block the regenerative converter 11 during operation by the emergency electric motor 3 and use the inverter 81 of the first unit for consuming regenerative power, a power outage detection function that closes when the AC power supply 1 is deenergized due to a failure is detected. Normally closed contact 2C of relay 2
, 2D, a microcomputer 210 control command input terminal 21' which controls the firing of the regeneration converter 11, respectively.
e and the microcomputer 221O for controlling the inverter 81 is connected in series to the control command input terminal 22a;
1 receives the output voltage of the DC voltage detection sensor 20. Further, a contactor 23 is connected to the control microcomputer 221 of the inverter 81, which is energized when the voltage detected by the sensor 20 exceeds a set value and it is determined that regenerative operation is in progress.

The inverter 81 of the first unit has transistors T1 to T6 connected to a three-phase bridge, and each transistor T1 to T6.
It consists of diodes D1 to D6 connected in parallel between the collector and emitter of T6, and this inverter 8
Both ends of a regenerative power consumption resistor 24 are connected between the two wires on the AC output side of the contactor 23 via normally open contacts 23A and 23B of the contactor 23.

Next, the operation of this embodiment configured as described above will be explained based on the flowchart shown in FIG.

In step 100, the control device starts, and in the next judgment step 101, when each microcomputer 21, 211 judges that the power failure detection relay 2 is energized, the control device starts in step 10.
2 to put the elevator control device into the normal power supply mode. That is, the elevator induction motors 101, 10
2. During power running, the three-phase voltage from the three-phase AC power source 1 is full-wave rectified by the converter 4, and further pulse width modulated by the inverter 81m B2 +... to drive the induction motor 1011102s...・Supplied to Also,
During regeneration, the thyristor of the converter 11 is controlled by the microcomputer 21 to drive the induction motor 10t*1.
02y... is taken out and returned to the AC power supply 1 side through the step-up transformer 12.

On the other hand, in step 101, if it is determined that the power failure detection relay 2 is deenergized due to a failure of the AC power supply 1,
Proceeding to step 103, the elevator control device is put into operation mode using the emergency generator 3. Then, in the next step 104, the normally closed contact 91 of the No. 1 machine is opened, and the operation of the No. 1 machine is stopped.

Next, in step 104, an energizing command is given to the contactor 23 from the microcomputer 221, energizing it to close its normally open contacts 23A and 23B, and connect the resistor 24 to the two wires on the output side of the inverter 81.

Further, in step 106, the microcomputer 21° 221 determines that the normally closed contacts 2C and 2D are closed, and a control command for closing the normally closed contacts 2C and 2D is sent to the respective microcomputers 21° 221. Once loaded, the microcomputer 21 stops sending the ignition signal to the converter 11 in step 107.

That is, converter 11 is blocked.

On the other hand, the microcomputer 221, which has received the control command by closing the normally closed contact 2D, determines in step 108 whether the detected voltage of the voltage detection sensor 20 exceeds a predetermined value, and determines whether the detected voltage exceeds the predetermined value. If it is determined that the transistor T2. Control is performed so that T4 is not turned on. In other words, block. Furthermore, if it is determined in step 108 that the detected voltage exceeds the predetermined value, it is determined that regenerative operation is in progress, and the process moves to the next step 110 to perform regenerative operation processing. As a result, the microcomputer 221 performs step 1.
11, the transistor T2. T4 is controlled to be ON, and the regenerated power of the induction motor 820 of the second machine is consumed by the resistor 24. That is, the regenerated power is not returned to the AC side, and therefore there is no need to provide a regenerative power consumption circuit on the AC side, and the emergency generator is not affected by the regenerated power.

In the above embodiment, a case has been described in which the regenerative power consumption resistor 24 is connected to the two output wires of the inverter 81.
It may be connected between the lines. Also, in case Unit 1 is operated with emergency power.

A circuit similar to that shown in FIG. 2 may be provided in the second machine.

〔Effect of the invention〕

As described above, the present invention has the following effects.

(b)) When the elevator is operating with a normal power source, the regenerated power is returned to the power source, so power consumption is small.

(b) When the elevator is operated by the emergency power supply, the regenerated power is consumed by using the inverter of the idle machine, so the regenerative power that is difficult to process does not flow into the emergency generator, and therefore the voltage Since notches do not occur, the capacity of the emergency generator can be small.

(,) It is economical because the number of circuit components of the regenerative power consumption circuit is small.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing a conventional elevator control device, Figure 2 is a circuit diagram showing a conventional elevator control device.
The figure is a circuit diagram showing an example of the elevator control device of the present invention, and FIG. 3 is a flowchart for explaining the operation of the present invention. □ 1... AC power supply, 2... power failure detection relay, 3...
Emergency generator, 4... converter for power running, 61 to 65
...Switch, 101-105...Induction motor, 1
1...for regeneration, 181-185...encoder,
20... Voltage detection converter, 12... Step-up transformer, 141-145... Sheave, 161-165
...basket, 17. ~175... Balance Omonsa, 21
... Microcomputer for controlling regenerative converter, 221-225... Microcomputer for controlling inverter, 23... Contactor, 24-... Resistor for regenerative power consumption.

Claims (1)

[Claims] An elevator induction motor corresponding to each of the plurality of elevators, separate inverters that supply variable voltage/variable frequency alternating current to each of the induction motors, a common elevator converter that supplies direct current voltage to the inverter group, An elevator control device comprising a common regeneration converter for regenerating regenerated power from the inverter group to the power source side, and operating a part of the elevator group using an emergency power source in the event of a failure of the power source, A circuit for regenerative power consumption is provided in the inverter of the idle machine other than the elevator of the operated machine, and when the elevator is operated by emergency power, the regenerated power is processed by the inverter of the idle machine and the regenerative power consumption circuit. What is claimed is: 1. An elevator control device characterized by comprising: means for controlling the elevator;