JPS5842694B2 - Jidou Fukuki Yusouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When an accident occurs in a system connected to a connecting bus of multiple generators, the present invention recovers the generator that was separated from the accident system and operated independently due to the accident. This invention relates to an automatic recovery device that automatically re-energizes the battery after a long wait to restore normal operation.

Conventionally, this type of automatic recovery device is applied to a generator G1. as shown in FIG. G2 is connected to the bus C through separate circuit breakers 52-1 and 52-2, and the load is connected to the bus C, and the main transformer T1 is connected to the bus B and the circuit breaker 1.
In a system in which system A is connected via line 52, voltage detection relay 184■ detects the presence of voltage on the recovery time line gun side of the accident system, and on this condition, circuit breakers 52-1 and 52-2 are tripped once. Then, after bringing the voltage to a no-voltage state, the breaker 152 is turned on to transmit power from the system A to the buses B and C to supply power to the loads, and - the power generator G1. In G2, transformer P
Electricity of bus C extracted from Tc and transformer PTG
1. Generators G1., respectively extracted from PTG2. The automatic synchronization detection device performs synchronization adjustment based on the output of G2, and then the circuit breakers 52-1 and 52-2 are turned on to restore normal operation.

However, according to such conventional recovery devices, when the number of generators increases, the generators are sequentially synchronously parallelized at the time of automatic recovery, and then the generator-side breaker is turned on, so the recovery time becomes extremely long, and the circuit It also had the disadvantage of being complicated.

In addition, since all the generators are disconnected from the bus bar and there is no voltage, it is not preferable for a system with a load of a single system or a system with a predetermined load.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic recovery device that can greatly shorten the automatic recovery time, achieve uninterrupted connection of the connecting bus, and eliminate the above-mentioned disadvantages. do.

Hereinafter, one embodiment of the present invention will be briefly described with reference to the drawings.

That is, FIG. 2 shows a system to which the automatic recovery device of the present invention is applied, where the same parts as in FIG. 1 are denoted by the same reference numerals.

In this case, 15 is an automatic speed adjusting device that adjusts the frequency of bus B to that of system A, 60 is an automatic voltage regulator that adjusts the voltage of bus B to that of system A, and 25 is an output when bus B is phase synchronized with system A. These devices 15, 60, 25 connect one end to the voltage detection relay 18.
Normally open contact 184V7 of 4■, normally open contact 186X4 of automatic recovery start relay 186X described later, and transformer PTL1
to the system A side end of the circuit breaker 152, and the other end to the normally open contact 184V3 of the voltage detection relay 184■, the normally open contact 186X of the starting relay 186X, and the transformer P T"L 2. It is connected to the busbar B side end of the disconnector 152.

AVR1tAVR2 is the transformer PTG1. A voltage regulator connected to the generator side end of the circuit breaker 52-1 and 52-2 through the PTG separately.
No. 2 uses its output to energize the excitation systems of No. 1 and No. 2 generators G, , and G2.

TD-VAR,. TD-VAR2 is the starting relay 18 mentioned above.
The normally open points 186Xa and 186X7 of 6X are connected to the transformer PTG1. These Tofunosunisa TDs are disabled type quadrangulators connected to the output terminal of PTG2.
-VAR1, TD -VAR2 are each generator G1.・G2
The system is designed to extract reactive power.

soR,;5oR2 are the voltage regulators AVR1, AVR
These resistors 90R,,9
0R2. is the No. 1 and No. 2 generator G1. The voltage of G2 is adjusted.

PMGl and PMG2 are No. 1 and No. 2 water turbines W7. ．． W/
, - a permanent magnet alternator connected to, 65P1,6
5P2 is connected to the generator PMG1.5P2 via the cabana. PMG2
These resistors 65P1 and 65 are powered by the output of motors 65PMI and 65PM2, which are controlled by a control circuit described later.
P2 is the No. 1 and No. 2 generator G1. The power of G2 is set.

Next, FIG. 3 shows the control circuit of the automatic recovery device in the same system.

That is, in the figure, P, , P2. P3. 'N is DC control bus, 1
8 "X" is the relay for automatic recovery activation, and this relay 186
One end of X is connected to bus bar N, and the other end is connected to breaker 1.
52 trip contacts 152bx are connected to the bus P1 via a contact 186R that is closed in the event of a system A accident and a switch 43AR that is closed when the automatic recovery device is in use, and a self-contact 186X1 is connected in parallel to the above contact 186R. It allows for self-preservation.

Further, the bus line P1. Connect P2 and the voltage detection relay 184■
through the contact 184v1 of the bus P2. Connect P3.

- Power, 65P□ is the electric adjustment resistor for power setting of the No. 1 generator G1 mentioned above, and among these, 65PM1 is the motor L1,
.

L1□# I'ts e L14 indicates the resistor position switches, among which switch I'tt j L12 is opened at the upper and lower limits of the resistance, and switch L131
L14 is for balance with other machines and is opened within the setting range.

The switch L11 has one end connected to the motor 55 PM, and the other end connected to the bus P3 via the contact 15R0, which is closed by the frequency increase signal in the automatic speed adjusting device 15, and the switch L'1'2 has one end connected to the motor 55PM. 60PM1, and the other end is connected to the guide ben opening for No. 1 generator d1 through a contact 74m1 that opens when the opening is below the no-load opening at high head, and a contact 15L that closes in response to a frequency range signal in the speed equalizing device 15. and connect to bus P3.

Also, one end of the switch L13 e L14'' is connected to the switch L1□.

They are connected to the other ends of L12 separately, and the other ends are commonly connected and connected to the bus P2 via the contact 184V2 of the electric power detection relay 18□4.

``9QR1 is the electric adjustment resistor for voltage adjustment and use of the above-mentioned No. 1 generator G1, and among these, g'j-AM is the resistance.''-Tami L2□, L2□t ``23 P L24 is the resistor. The switch L2□ and L2□ are opened at the upper and lower limits of the resistance, and the switch L23;
It is for balance with L'24 k22 and is opened within the settling range.

The switch L21 has one end connected to the terminal 90 RM, and the other end closed by the voltage end signal of the automatic voltage regulator 60t mentioned above, when the polarized relay QX1 described later is not in operation. Contact 4x, which closes with a balance signal (→), -mH blood line circuit, contact 60L2 that opens when the voltage decrease signal in the voltage regulator 60, and close balance signal (g) when the polarized relay QX1 is inactive opens. Switch L2 is connected to bus P3 via contact QX1□-L0.
2- is a contact 6 whose one end is connected to the voltage regulator 90 RMl and whose other end is closed by the voltage reduction signal in the voltage regulator 60.
oL;”=parallel circuit of contact QX knee L2 which is opened when the polarized relay QX1 is inactive and opened by the balance signal (g), contact 60L which is opened by the voltage increase signal in the voltage regulator 60!, and the polarized relay Bus line P via contact QX□-R2, which opens when relay QX is inactive (to balance signal)
3 respectively.

Further, the switches L23 and L24 have one end connected to the switch L2.

Connect each end to the other end of L2□ separately, and connect the other ends in common to the bus P
Connect to 2.

Furthermore, 65P2 and 90R2 indicate the electric adjustment resistor for power setting and the electric adjustment resistor for voltage setting of the No. 2 generator G2, which are similar to the above-mentioned resistors 65P0 and 90R.
Since it is configured in the same circuit as No. 1, its explanation will be omitted.

Next, FIG. 4 shows the closing circuit of the breaker 152, and the closing coil CC of the breaker 152 is a contact 25-1 that is closed when synchronization is detected by the automatic synchronizer 25, and a contact 184'la of the voltage detection relay 184■. and the above starting relay 18
It is connected between the DC buses P and N via the 6X contact 186X.

Next, FIGS. 5 and 6 show control circuits of the polarized relay QX, and Q1. Q2. ...Qn is the invalid quadrangular juicer TD-VAR1゜TD-VA of each machine
Output of R2,..., OA1#0A21...
... is an operation in which the above outputs are given to each force input terminal separately, the other force input terminals are commonly connected, and resistors R1#R2t... with equal resistance values are connected separately between both input terminals. The amplifiers QX, QX2, . . . are polarized relays connected to the output terminals of the amplifiers oA11OA2, .

In this case, a signal proportional to the deviation in the average value of the reactive power of each machine is generated in the resistors R□, R2, . . . .

That is, resistance R,<chiQ, -Ql +Q2""""
ngl: A signal with the reversed polarity is generated and is sent to the amplifiers OA1, OA2. Increase the width with ・・・・・・Polarized relay Q
X1. QX2... is applied to obtain a predetermined operation.

To explain this in detail in Fig. 7, the amplifiers OA, OA2゜.
... can select a large input impedance, so if this is ignored, the circuit current of output Q1 → resistor R1 → resistor R2 → output Q2 will be only H4.

(However, the current force direction was set to the direction of Ql.) Therefore, the resistance R4
The voltage at both ends is.

As a result, the No. 1 and No. 2 generators G□ are connected to both ends of the resistor R0.
, G2 is detected, and the polarity of this detection signal is used to cause the polarized relay QX1 to perform a predetermined operation.

Next, the operation of the present invention constructed as above will be described. First, when an accident occurs in the system A, the breaker 152 is automatically tripped by a protection device (not shown).

Further, in FIG. 3, if the switch 43AR has been previously turned on and used, the starting relay 186X is activated by closing the contact 186R under the system A fault condition and is self-held at the contact 186X1.

Then, the power supply voltage is applied to the control power bus P2 by closing the contact 186
~184V, is closed.

Before the whole system accident, the electric adjustment resistors 65P1 and 65P2 for power setting of No. 1 generator G1 and No. 2 generator G2
, if both generators G, , G2 are operated at different setting positions of the voltage setting electric regulating resistors 90R1 and 90R2, then both generators G1 . G2 is disconnected from system A due to a system accident (and is operated in a state where the load capacity is exceeded and in an unbalanced state between both generators Gly 02).

Therefore, IJG from No. 1. Electric adjustment resistor 6 for power setting
For 5P0, balance switch L13 or L84
, and electric adjustment resistor 65 for power setting of No. 2 generator G2.
At P2, the balance switch "33" or "L34" is closed, respectively, and the set value is adjusted to obtain a power corresponding to the load capacity.

In addition, if the electric voltage adjustment resistors 90R and 90R2 of the No. 1 generator G8 and the No. 2 generator G2 are set to different setting positions after the system is disconnected, both generators will be activated when the system A is restored. Since a control time delay and a cross current occur due to the unbalance between the balance switch L23 or L24 in the voltage adjustment electric adjustment resistor 90R1 of the No. 1 generator G, and the voltage adjustment electric adjustment resistor 90R1 of the No. 2 generator G2. In the resistor 90R2, the balance switch L43 or L44 is closed, respectively, and the set values thereof are adjusted to be the same value.

Therefore, the power of No. 1.1 and No. 2 generators G1 and G2 is commensurate with the load capacity, and both generators G1. Electric power can be supplied to the load while maintaining substantially the same voltage as G2.

When the fault in system A is recovered from such a state, voltage detection relay 1842 detects the voltage distribution in system A and is activated.

Therefore, the contact of detection relay 184■ 184V7, 184V
9 and the contacts 186X of the above starting relay 186X 4,1
86
contact 184V1 in FIG.
is closed, and contacts 184V2 to 184V are opened.

Also, contact 186X (i, 18
Disabled quadrant TD-VAR via 6X7,
.

TD-VAR2 is No. 1 and No. 2 generator G1. Connected to the output terminal of G2.

Therefore, the speed equalizing device 15 generates a frequency increase signal or a wave signal t so that the frequency of the bus B matches that of the system A, and closes the corresponding contact 15R0 or 15L1.
In the figure, the power setting adjustment resistor 65P1 of the No. 1 generator G1 is automatically adjusted within the range of switches L1ie L12 to set the frequency of the generator G1 to match that of the system A.

- the automatic voltage regulator also generates a voltage increase or wave signal so that the voltage of bus B matches that of system A, closes its corresponding contact 60R1 or 60L1, and also closes the above disabled quadrant as required. Juicer T D -VAR,, T
The output of D-VAR2 causes the No. 1 and No. 2 generators G1. Reactive power Q of G2, ,Q2
The polarized relay QX1, which responds to the average value difference signal,
By closing X1-R1 or QXl-R2, the voltage setting adjustment resistor 90R1 of the No. 1 generator G0 becomes the switch L2□.

The voltage of generator G1 is automatically adjusted within the range of L2□ to system A.
Set it to match that of .

In addition, electric adjustment resistor 65P2 for power setting for No. 2 generator
Similarly, the voltage setting electric regulator 90R2 is automatically adjusted to set the frequency and voltage of the No. 2 generator G2 to satisfy the conditions of the system A.

The generator G1. When the frequency and voltage of bus B are matched to those of system A by automatic adjustment of G2 and phase synchronization is achieved, automatic synchronizer 25 is operated.

Therefore, in FIG. 4, the contact 25-1 of the synchronizer 25
Waiting for this to close, the closing coil CC of the breaker 152 is energized through the contacts 186X3 and 184V, so the breaker 152 is closed and the system A is connected to the bus B again.

Further, by turning on the circuit breaker 152, the starting relay 186X is reset, and the automatic speed equalizing device 15, automatic voltage adjusting device 60, and automatic synchronizing device 25 are connected to the transformer PTL1. It is disconnected from PTL2 and automatic recovery is completed.

In this case, in the above control, when the automatic speed adjusting device 15 closes the contacts 15L1 and 15L2 using a frequency domain signal and lowers the power setting adjustment resistors 65P1 and 65P2, respectively, An unbalance occurs between generators G1 and 02, for example, the lowering control of the No. 1 generator G0 is
If it is extremely ahead of that of No. 1 generator G2, Ryokodenki G
l t It becomes impossible to operate with an average load applied to G2.

Therefore, in such a case, the contact point 74m1 is opened to limit the lowering control of the No. 1 generator G1 to prevent the electric crab swing between the two photoelectric machines G1.02.

In addition, if the balance of the setting values of the voltage setting adjustment resistors 90R, 90R2 is lost under the control of the automatic voltage regulator 60 after the system A is restored, the No. 1 and No. 2 generators G1, 0
Stable voltage adjustment is not possible due to cross current between the two.

Therefore, in FIG. 3, the adjusting device 6 shown in FIG.
To explain the case of raising control by closing the T contact 60R0 with reference to the time chart of No. If preceded, the No. 1 and No. 2 generators G1. G2
Disabled quadrangulator T D −VARl, T
Reactive power Q2 detected by D-VAR2. Since a positive output is generated between the resistor n1 from the average value difference signal of Q2, the contacts QX1-L1 of the polarized square relay QX1 are opened, and the contacts QX and -L2 are closed.

Therefore, the raise control of resistor 90R1 is cut off by opening contact QX-L1, and contact QX
- L2 is closed to control the lowering, and the amount that has gone ahead is returned.

As a result, the set values of the resistors 90R1 and 90R2 can be adjusted while always being balanced, thereby preventing cross current between the generators G1 and G02, thereby enabling stable voltage control.

. As described above, according to the present invention, even if an accident occurs on the grid side connected to the connecting bus of multiple generators, only the grid breaker can be shut off and the connecting bus can be made uninterrupted without disconnecting from the bus. Therefore, it is convenient for those that have a load on a single system and those that have an in-house load.

In addition, when performing synchronous paralleling with the circuit breaker on the automatic restoration J system side, the setting positions of the electric adjustment resistors for power setting and the electric adjustment resistors for voltage setting of multiple generators should be balanced in advance. , since each generator can be controlled simultaneously when verifying synchronization with the grid, automatic recovery can be achieved by sequentially turning on the circuit breaker on each generator side while performing synchronization verification of each generator with the grid individually as in the past. Compared to a system designed to achieve this, it is possible to shorten the time it takes to restart each generator after a grid failure has been recovered.

Furthermore, the voltage and frequency setting of each generator is commanded by an automatic voltage regulator and an automatic speed equalizer, and the voltage of the connected bus is adjusted by taking into account the invalid cover balance control between each generator and the limit control in the direction of frequency reduction. Since the frequency is synchronized with that of the grid and the breaker on the grid side is turned on for automatic recovery, cross current between generators and power swings can be reliably prevented and stable automatic recovery can be performed. .

[Brief explanation of the drawing]

Figure 1 shows system diagrams 1 and 2 that apply a conventional automatic recovery device.
Figure & Figure 6 is a system diagram to which an embodiment of the automatic recovery device according to the present invention is applied, Figures 3 to 6 are circuit diagrams showing the control circuit of the same recovery device, and Figure 7 is an explanatory diagram of the operation of the same device. . A...System, B, C...Bus, G1.
G2... Generator, T... Main transformer, 1
52.52-1.52-2... Breaker, 18
4V...Voltage detection relay, 15...Automatic speed equalizer, 60...Automatic voltage regulator, 2.
5...Medium motion synchronizer, 90 R1, 90R2...
...Electric adjustment resistor for setting the amount of electricity, 65P1.65P
2...Electric adjustment resistor for power setting, TD-VA
Rl.

Claims (1)

[Claims] 1. In a system in which the connecting bus bars of multiple generators are connected to the grid via a breaker, and the grid is disconnected by the breaker in the event of an accident in the grid, each generator is equipped with an electric resistor for power adjustment and voltage. It is provided with a setting motorized resistor, and when each generator is disconnected from the grid due to an accident in the grid, each setting position of the power setting motorized resistor of each of the generators is set so that an amount of electric power corresponding to the load capacity can be obtained. In addition, each setting position of the voltage-setting motorized resistor of each of the generators is balanced so that there is no control time delay or cross current due to unbalance between the generators when the system is restored, and the When the fault in the grid is recovered, each setting position of the electric power setting electric resistor of each of the generators is adjusted so that the frequency of each generator is synchronized with that of the grid, taking into account limit control in the direction of frequency reduction. A control device is provided that adjusts each setting position of the voltage-setting motorized resistor so that the voltage of each generator is synchronized with that of the system, taking into account reactive power balance control, so that the phases of the bus and the system are synchronized. An automatic recovery device characterized in that the above-mentioned power cutter is turned on after waiting for automatic recovery of each of the above-mentioned generators.