JPH11191996A - Synchronous power generation system - Google Patents

Abstract

(57) Abstract: The present invention provides a synchronous power generation system that can synchronize a plurality of power generation devices in a short time. SOLUTION: The present invention relates to a generator with a motor 2b, 3b.
A synchronous power generation system 1 having a synchronous control means 12 for synchronizing two or more of the generators and controlling the output of one generator 2b to synchronize with the output of the other generator 3b. A voltage balancing function 9b for controlling the deviation between the voltage of one generator 2b and the voltage of the other generator 3b within a predetermined range; and the frequency of one generator 2b and the other generator 3b.
b) speed adjustment function 8 for controlling the deviation from the frequency b within a predetermined range
9a, when the voltage deviation falls within the predetermined range and the frequency deviation falls within the predetermined range,
A synchronization input function 9c for outputting a signal for closing the
The aligning speed function 8.9a has a first predetermined range before the synchronizing function 9c operates and a second predetermined range after the synchronizing function 9c operates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous power generation system, and more particularly, to a synchronous power generation system capable of setting a time from start of two or more generators to synchronization.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional synchronous power generation system 51 includes power generation devices 52X and 53Y and a circuit breaker 54X.
55Y, voltage transformers 56X and 57Y, and a synchronization control device 61.
By synchronizing with Y, a large output voltage Sg63
Is supplied. This power generator 52X · 5
3Y includes engines 52a and 53a and a synchronous generator 52b.
53b and the engines 52a and 53a
As a result, the synchronous generators 52b and 53b are rotated, and a rectified voltage is output to the load side by an exciter (not shown). In addition, the circuit breakers 54X and 55Y
X · 53Y, which is connected to the output side of the
-ON / OFF of the output of 53Y is performed. Further, the voltage transformers 56X and 57Y are connected to the power generator 5
The high voltage output from the 2X · 53Y is reduced to a voltage suitable for synchronous control. The synchronization control device 61 includes a synchronization device 58, a fuel control unit 59, and an automatic voltage adjustment unit 60, and controls the power generation device 52X such that the power generation device 52X is synchronized with the power generation device 53Y. (Synchronous control).

The synchronizer 58 includes a voltage transformer 56X
• Low voltage Sg53X • Sg5 connected to 57Y
When 4Y is taken in, the frequency, phase, and voltage of the power generation device 52X are controlled. This synchronization device 58
Speed adjusting section 58a, voltage balancing section 58b, synchronization input section 58
c, and the speed adjusting section 58 a
The frequency of X is controlled. The voltage balance unit 58b controls the voltage of the power generation device 52X, and the synchronization input unit 58c controls the phase of the power generation device 52X to turn ON / OFF the circuit breaker 54X. . That is, the synchronization input section 58c transmits the synchronization input signal Sg57 to the circuit breaker 54X, thereby turning ON / OFF.
It is designed to be turned off.

[0004] The fuel control section 59 is connected to the speed control section 58c. When the fuel control section 59 receives the frequency control signal Sg55, the fuel control section 59 generates the engine 52 based on the frequency control signal Sg55.
The control of the increase or decrease of the fuel a is performed. Further, the automatic voltage regulator 60 is connected to the voltage balancer 58b, and upon receiving the voltage control signal Sg56, controls the voltage of the synchronous generator 52b based on the voltage control signal Sg56. I have. The conventional synchronous power generation system 51 configured as described above can supply a large output voltage Sg63 to the load side by synchronizing the power generation device 52X with the power generation device 53Y.

[0005]

However, in the conventional synchronous power generation system 51, since the synchronizer 58 does not support high-speed control and has a long time in the synchronous control, the two power generators are controlled within the legally stipulated time by the Fire Service Law. There is a problem that the 52X and 53Y cannot be synchronized.

Accordingly, the present invention has been made in view of the above problems, and has as its object to provide a synchronous power generation system that can synchronize a plurality of power generation devices in a short time. is there.

[0007]

According to the first aspect of the present invention,
A synchronous power generation system having synchronization control means for synchronizing two or more generators with a motor and controlling the output of one generator to synchronize with the output of the other generator, wherein the synchronization control means comprises: A voltage balancing function for controlling the deviation between the voltage of the generator and the voltage of the other generator within a predetermined range, and controlling the deviation between the frequency of one generator and the frequency of the other generator within a predetermined range. A synchronizing function, and a synchronizing function for outputting a signal for closing the circuit breaker at a synchronous point when the voltage deviation falls within the predetermined range and the frequency deviation falls within the predetermined range. Has a first predetermined range before the synchronization input function is activated and a second predetermined range after the synchronization input function is activated. Thus, by changing the setting of the first predetermined range, the time until the synchronization of the generator can be adjusted to a desired time.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the first predetermined range is set to be larger than the second predetermined range. Features. Thereby, the time from the start of the generator to the synchronization can be shortened.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, the output from the uniform speed function can be output to a high speed control side and a normal speed control side. Until the synchronizing function is activated, the signal is output to the high-speed control side. Thus, the frequency of one of the generators can be controlled at a high speed until the synchronization input function is activated, so that the time from the start of the generator to the synchronization can be further shortened.

According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the generator-equipped generator can be switched to an emergency power supply at the time of a power failure. It is characterized by the following. As a result, the emergency power supply is required to be able to start up within the legal time,
We can respond to this request.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the synchronous power generation system 1 according to the present embodiment includes a power generation device 2X / 3Y, a circuit breaker 4X / 5Y, a voltage transformer 6X / 7Y, and a synchronization control device 12 constituting a synchronization control unit. By synchronizing the power generation device 2X with the power generation device 3Y, a large output voltage Sg28 is supplied to the load side.

The above-mentioned power generators 2X and 3Y
a, 3a and synchronous generators 2b, 3b. The synchronous generators 2b, 3b are rotated by the engines 2a, 3a, and a rectified voltage Sg26, S
g27 is output to the load side. In the present embodiment, the engines 2a and 3a are described as gas engines, but the engines 2a and 3a are
The gas engine is not limited to the gas engine as long as it can rotate b and 3b, and may be a diesel engine or a gas turbine.

The above-described circuit breaker 4X is connected to the output side of the power generator 2X and the synchronization input section 9c.
Is turned ON / OFF. That is, when the circuit breaker 4X is turned on, the output voltages Sg26 and Sg27 of the two power generators 2X and 3Y merge to become a large output voltage Sg28.

The above-mentioned voltage transformers 6X and 7Y are connected to the power generators 2X and 3Y. It is designed to descend. This is because the high voltage Sg1X and Sg2Y cannot be output to the synchronization control device 12 as it is.

The above-mentioned synchronous control device 12 includes a first speed control unit 8
And a synchronizing device 9, a fuel control unit 10, and an automatic voltage adjusting unit 11, so that the power generation device 2X is controlled (synchronous control) so that the power generation device 2X is synchronized with the power generation device 3Y. Has become.

As shown in FIG. 2, the first speed adjusting unit 8 includes a frequency converter 13 and a frequency converter 15 and a frequency difference detector 15.
And a comparison unit 16 and a frequency control unit 17.
The frequency of the power generation device 2X is controlled. The frequency converters 13 and 14 are connected to the voltage transformers 6X and 7Y, and convert the AC voltages Sg3X and Sg4Y into the DC voltages Sg5X and Sg6Y.
The conversion into the DC voltage is performed because the frequency difference detection unit 15 can easily calculate the frequency deviation (hereinafter, referred to as “frequency deviation”) of the synchronous generators 2b and 3b.

The frequency difference detector 15 is connected to the frequency converters 13 and 14, and receives the DC voltage Sg5X · S
The frequency deviation Sg7 is calculated from g6Y, and the frequency deviation Sg7 is calculated separately from a second speed-consolidating section 9a described later. Note that an adder / subtractor is used for the frequency difference detector 15. The comparing section 16 is connected to the frequency difference detecting section 15 so as to determine whether or not the frequency deviation Sg7 is within a predetermined range. The frequency control unit 17 is connected to the comparison unit 16 and calculates a frequency control signal Sg9 for controlling the frequency of the power generation device 2X based on the frequency deviation Sg8.

The predetermined range is 0.15 Hz ≦ (frequency deviation Sg7) ≦ 0.3 Hz, and the predetermined range ′ is 0.2 Hz ≦
(Frequency deviation Sg7) ≦ 0.3 Hz, but within a predetermined range.
Is not limited to this because it fluctuates depending on the legally stipulated time according to the Fire Service Law. That is, if the legal time becomes shorter (more than 40 seconds), it is necessary to shorten the time interval between the phase matching points, so that the upper limit of the frequency deviation needs to be larger than 0.3 Hz. Note that the relationship between the frequency deviation and the phase difference is such that when the frequency deviation is large, the time interval between the phase matching points is short, and when the frequency deviation is small, the time interval between the phase matching points is long.

As shown in FIG. 1, the synchronizing device 9 includes:
Second speed adjusting section 9a, voltage balancing section 9b, and synchronization input section 9c
, And mainly performs synchronous input control. As shown in FIG. 3, the second speed adjuster 9 a includes frequency converters 18 and 19, a frequency difference detector 20, a comparator 21, and a frequency controller 22.
The frequency of X is controlled. The frequency converters 18 and 19 are connected to the voltage transformers 6X and 7Y, and convert the AC voltages Sg3X and Sg4Y into the DC voltage Sg10.
X · Sg11Y is converted.

The frequency difference detector 20 is connected to the frequency converters 18 and 19, and receives the DC voltage Sg10X.
The frequency deviation Sg12 is calculated from Sg11Y. Note that an adder / subtractor is used for the frequency difference detector 20. Further, the comparison section 21 is connected to the frequency difference detection section 20, and determines whether or not the frequency deviation Sg12 is within a predetermined range. The frequency control unit 22 is connected to the comparison unit 21, and based on the frequency deviation Sg13, the power generation device 2X
The frequency control signal Sg15 for controlling the frequency is calculated. Note that the predetermined range is 0 Hz <(frequency deviation Sg12) <0.15 Hz, but is not limited thereto.

The voltage balancer 9b is provided with a voltage difference detector 2
3, a comparison unit 24, and a voltage control unit 25,
The voltage of the power generation device 2X is controlled. The voltage difference detector 23 calculates the voltage deviation Sg16 from the DC voltage output from a frequency converter (not shown). Further, the comparison unit 24 is connected to the voltage difference detection unit 23, and determines whether the voltage deviation Sg16 is within a predetermined range. Further, the voltage control unit 25 is connected to the comparison unit 24, and calculates a voltage control signal Sg19 for controlling the voltage of the power generation device 2X based on the voltage deviation Sg17.

The synchronization input section 9c includes a phase difference detecting section 2
6, a synchronization input point detection unit 27, and an input unit 28, and calculates a synchronization input point for synchronizing the power generation devices 2X and 3Y. The phase difference detection unit 26 is connected to the comparison units 21 and 24 of the second speed adjustment unit 9a and the voltage balance unit 9b, and the frequency deviation Sg12 and the voltage deviation Sg16
Is within a predetermined range, the AC voltage Sg3X.Sg4
The phase difference Sg20 of the frequency of the power generators 2X and 3Y is detected from Y. In addition, the synchronization input point detection unit 2
7 is connected to the phase difference detection unit 26, and the phase difference Sg
From 20, a phase matching point (synchronization input point) of the frequency of the power generators 2 </ b> X and 3 </ b> Y is detected. Further, the input section 9c is connected to the synchronization input point detection section 27, and transmits a synchronization input signal Sg22 to the circuit breaker 4X at a timing from the phase coincidence point. As a result, the circuit breaker 4X is turned on, and the power generators 2X and 3
Y synchronizes.

As shown in FIG. 1, the fuel control unit 10
Is connected to the engine 2a of the power generator 2X, and controls the increase and decrease of the fuel of the engine 2a.
This is because the frequency of the synchronous generator 2b changes due to the increase and decrease of the fuel of the engine 2a. Further, the fuel control unit 10 controls an increase or decrease in the fuel of the engine 2a by controlling an actuator (not shown).
This is because the power generators 2X and 3Y open and close the valves of the fuel gas line by this actuator.

The fuel control unit 10 includes a high-speed control unit 10
a and the normal control unit 10b, and controls the increase and decrease of the fuel at a high speed until synchronously input. The high-speed control unit 10a is connected to the frequency control unit 17 of the first speed control unit 8, and increases or decreases the fuel of the engine 2a based on the frequency control signal Sg9 so that the frequency deviation Sg7 falls within a predetermined range. Is controlled. Further, the normal control unit 10b is connected to the frequency control unit 22 of the second speed control unit 9a, and the frequency control signal Sg
15, the increase or decrease of the fuel of the engine 2 a is controlled so that the frequency deviation Sg12 falls within a predetermined range. The fuel control unit 10 is mainly configured by an electronic governor and a speed setting device that is a D / A converter, and the high speed control unit 10a is mainly configured by a speed setting device having a fast response.

The automatic voltage regulator 11 is connected to the voltage balancer 9b, and based on the voltage control signal Sg19, controls the synchronous generator so that the voltage deviation Sg17 of the power generators 2X and 3Y falls within a predetermined range. 2b is controlled. The automatic voltage adjustment unit 11 includes a voltage setting device that is a D / A converter.

In the above configuration, the synchronous power generation system 1
Will be described. As shown in FIG.
When a start command is issued to 3Y (0 second), the power generator 3Y starts up at about 13.5 seconds and enters a steady state after 18 seconds. On the other hand, the power generation device 2X rises around about 15 seconds, and enters a steady state after 18 seconds. Next, the power generation device 2X
Upon detecting that both power generation devices 2X and 3Y have entered the steady state, the synchronization control device 12 on the side starts synchronization input control so that the power generation device 2X is synchronized with the power generation device 3Y (18).
Seconds).

When the synchronization control device 12 starts the synchronization control, the first speed control unit 8 controls the frequency conversion units 13 and 14 and the frequency difference detection unit 15 so as to match the frequencies of the two power generation devices 2X and 3Y. The frequency control signal Sg9 is calculated via the unit 16 and the frequency control unit 17. Here, as shown in FIG. 4, the frequency deviation Sg7 is large for a few seconds (around 18 seconds to 25 seconds) from the start of the synchronous injection control and is not within the first predetermined range. Sg7
Is controlled so as to fall within the first predetermined range.
Is calculated. When the high-speed control unit 10a receives the frequency control signal Sg9, the fuel control unit 10
An actuator (not shown) is controlled so that the frequency of X decreases. Then, the actuator adjusts the valve of the fuel gas line to reduce the amount of fuel supplied to the engine 2a. Thus, the frequency of the power generation device 2X gradually decreases and approaches the frequency of the power generation device 3Y.

On the other hand, while the first speed control unit 8 is performing the synchronization control, the synchronizer 9 calculates the voltage control signal Sg19 so that the voltage of the two power generators 2X and 3Y is adjusted by the voltage balance unit 9b. At the same time, the second speed controller 9a determines whether the frequency deviation Sg12 is within the first predetermined range '. During a few seconds (around 18 seconds to 25 seconds) from the start of the synchronization input control, the frequency difference Sg12 is not within the first predetermined range ', so that the phase difference detection unit 26 of the synchronization input unit 9c does not operate.

When the above processing is repeated, the frequencies of the two power generators 2X and 3Y gradually approach, but close to 33 seconds, so that the frequency control unit 1 of the first speed adjusting unit 8 becomes too close.
7, so that the frequencies of the two power generators 2X and 3Y are separated,
The frequency control signal Sg9 is calculated. That is, in the vicinity of 33 seconds, the frequency deviation Sg7 becomes smaller than the lower limit of the first predetermined range, so that the frequency control signal Sg9 is calculated so as to fall within the first predetermined range. When the high-speed control unit 10a receives the frequency control signal Sg9, the fuel control unit 10 controls an actuator (not shown) so that the frequency of the power generation device 2X increases. Then, the actuator adjusts the valve of the fuel gas line to increase the amount of fuel supplied to the engine 2a. As a result, the frequency of the power generator 2X gradually increases and slightly deviates from the frequency of the power generator 3Y. As described above, when the frequencies of the power generation devices 2X and 3Y are too close to each other, the frequency of the power generation device 2X is increased when the frequency deviation Sg7 is smaller than the lower limit within the first predetermined range. Is longer, and it is not possible to synchronize the two power generators 2X and 3Y within the legal time (40 seconds).

In the above processing, if the frequency deviation Sg7 is determined to be within the first predetermined range by the comparing unit 16 of the first speed-consolidating unit 8 around 34 seconds, the frequency control unit 17 determines that the frequency deviation Sg7 is within the first predetermined range. The frequency control signal Sg9 is calculated so as to fall within the 'first predetermined range'. Even if the frequency deviation Sg7 is within the first predetermined range, if the frequency deviation Sg7 is outside the first predetermined range ', the time interval between the phase matching points is still long, and the two power generators 2X. This is because it is difficult to synchronize 3Y. Then, upon receiving the frequency control signal Sg9, the high-speed control unit 10a controls an actuator (not shown) so that the frequency of the power generation device 2X increases, and the actuator adjusts a valve of the fuel gas line to supply the fuel to the engine 2a. Increase the fuel that is used.

Next, after the above processing, the frequency deviation Sg12 falls within the first predetermined range by the comparison unit 21 of the second speed control unit 9a.
Is determined, the phase difference detection start signal Sg14 is transmitted to the phase difference detection unit 26 of the synchronization input unit 9c. Further, the voltage deviation Sg1 is determined by the comparison unit 24 of the voltage balance unit 9b.
When it is determined that 6 is within the predetermined range, the phase difference detection start signal Sg18 is transmitted to the phase difference detection unit 26. Upon receiving the phase difference detection start signals Sg14 and Sg18, the synchronization input section 9c operates, and the phase difference detection section 26 and the synchronization input point detection section 27 detect a phase coincidence point (synchronization input point).
When the input unit 28 receives the phase coincidence point Sg21, it measures the timing so that the phases of the two power generating devices 2X and 3Y coincide, and transmits the synchronous input signal Sg22 to the circuit breaker 4X (around 36 seconds). In addition, a high-speed control stop signal is transmitted so that a circuit breaker (not shown) provided on the input side of the first speed control unit 9 is turned off. The circuit breaker (not shown) is turned off because the frequency deviation Sg
This is to prevent the calculation of the frequency control signal Sg9 that makes the value 8 larger.

When the circuit breaker 4X receives the synchronization input signal Sg22, the circuit breaker 4X is turned on, and both power generators 2X
・ 3Y is synchronized. When the synchronous input is performed in this manner, the synchronous input control by the synchronous control device 12 ends (around 36 seconds). When the synchronization input control ends, the synchronization control device 12
Performs normal control so that the power generators 2X and 3Y maintain a synchronized state. That is, the second speed controller 9a and the normal controller 1
0b is finely adjusted so that the frequency deviation Sg12 of the two power generators 2X and 3Y is constant within the second predetermined range. Also,
The voltage balance unit 9b and the automatic voltage adjustment unit 11 also have a voltage deviation S
Fine adjustment is performed so that g16 is constant within a predetermined range.

In the present embodiment, the first speed control unit 8 is provided separately from the synchronizer 9. However, the present invention is not limited to this, and the first speed control unit 8 is provided in the synchronizer 9. The provided structure may be used. Further, in the present embodiment, for convenience of explanation, the synchronization control device 12 has been described as being provided only on the power generation device 2X side, but actually, it is provided for each power generation device.

[0034]

According to the first aspect of the present invention, there is provided a synchronous control device having a synchronous control means for synchronizing two or more generators with a prime mover, controlling the output of one generator and synchronizing with the output of the other generator. A power generation system, wherein the synchronization control means includes: a voltage balancing function of controlling a deviation between a voltage of one generator and a voltage of the other generator within a predetermined range; A signal for closing the circuit breaker at a synchronization point when the voltage deviation falls within the predetermined range and the frequency deviation falls within the predetermined range, A synchronizing function for outputting the first predetermined range until the synchronizing function is activated and a second predetermined range after the synchronizing function is activated.
This is a configuration having a predetermined range. Thus, by changing the setting of the first predetermined range, there is an effect that the time until the synchronization of the generator can be adjusted to a desired time.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the first predetermined range is set so as to be deviated to a side where the deviation is larger than the second predetermined range. is there. Thereby, there is an effect that the time from the start of the generator to the synchronization can be shortened.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the output from the speed-matching function can be output to a high-speed control side and a normal speed control side. Until the synchronizing function is activated, the signal is output to the high-speed control side. Thus, the frequency of one of the generators can be controlled at a high speed until the synchronization input function is activated, so that the time from the start of the generator to the synchronization can be further shortened.

According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the generator-equipped generator can be switched to an emergency power supply at the time of a power failure. Configuration. Thus, the emergency power supply is required to be able to start up within the legal time, but there is an effect that it can respond to this request.

[Brief description of the drawings]

FIG. 1 is a block diagram of a synchronous power generation system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a first speed control unit according to the embodiment of the present invention.

FIG. 3 is a block diagram of a synchronization device according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating the operation of the synchronous power generation system according to the embodiment of the present invention.

FIG. 5 is a diagram illustrating a block diagram of a conventional synchronous power generation system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Synchronous power generation system 2 Power generation device X 3 Power generation device Y 4 Circuit breaker X 5 Circuit breaker Y 6 Voltage transformer X 7 Voltage transformer Y 8 First speed regulating unit 9 Synchronous device 10 Fuel control unit 10a High speed control unit 10b Normal control Unit 11 Automatic voltage adjustment unit 12 Synchronous control device 16 Comparison unit 21 Comparison unit First predetermined range Second predetermined range

Claims (4)

[Claims] 1. A synchronous power generation system having a synchronous control means for synchronizing two or more generators with a prime mover, controlling the output of one generator and synchronizing with the output of the other generator, The control means includes a voltage balancing function for controlling a deviation between the voltage of one generator and the voltage of the other generator within a predetermined range, and a predetermined function for determining a deviation between the frequency of one generator and the frequency of the other generator. A synchronizing function for controlling the speed within a range; and a synchronizing function for outputting a signal for closing the circuit breaker at a synchronous point when the voltage deviation falls within the predetermined range and the frequency deviation falls within the predetermined range. The synchronizing speed function is a first time until the synchronization function is activated.
A synchronous power generation system having a predetermined range and a second predetermined range after the synchronization input function is activated. 2. The synchronous power generation system according to claim 1, wherein the first predetermined range is set so as to be deviated to a side where the deviation is larger than the second predetermined range. 3. An output from the speed-matching function can be output to a high-speed control side and a normal speed control side, and is output to the high-speed control side until the synchronization input function is activated. The synchronous power generation system according to claim 1 or 2, wherein 4. The power generator with a motor can be switched to an emergency power supply at the time of a power failure.
A synchronous power generation system according to claim 3.