JPH0993797A - Plant control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce breaker capacity by tripping a transmission current breaker and a field circuit breaker when an accident is detected by an accident detection means, also tripping a generator breaker after completion of the preceding trip. SOLUTION: When generation of an accident is detected, a trip command is output to a system breaker circuit by an OR circuit. Then, the system breaker circuit trips a transmission breaker 6 and a field circuit breaker 37 simultaneously, thereby interrupting an accidental current flowing in an accidental point of a main circuit from an electric power system and an excitation current supplied to a field winding 39 of a generator motor as well. After completion of this trip, a generator breaker 16 is tripped. In this way, interruption of the accidental current flowing in from the electric power system is dispensed with by the generator breaker 16, so that its breaking capacity can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant control device for interrupting a fault current generated in a main circuit of a generator / motor installed in a pumped storage power plant and for controlling the start / stop of the generator / motor. Is.

[0002]

2. Description of the Related Art FIG. 7 shows, for example, Vol.
49 No. 9 1975 is a single-line connection diagram showing a conventional plant control apparatus shown on page 625, in which 1 is a generator motor for pumped-storage power generation, 2 is a main circuit of the generator motor 1, 3 is a local circuit, and 4 is a Excitation circuit of generator motor 1,
Reference numeral 5 is a power transmission line that connects the main circuit 2 of the generator motor 1 to the power system, 6 is a power transmission breaker, and 7 is a current transformer.

Further, 8 is a main transformer installed in the main circuit 2 of the generator motor 1, 9 is a transformer overcurrent relay, 10 is a transformer ratio differential relay, 11 is a phase inversion disconnector for power generation operation,
12 is a phase inversion disconnector for pumping operation, 13, 14 and 15 are current transformers installed in the main circuit 2 of the generator motor 1, 16 is a generator breaker installed in the main circuit 2 of the generator motor 1, 17
Is a generator overcurrent relay, 18 is a generator ratio differential relay,
Reference numeral 19 is an electric brake disconnector that short-circuits the terminals of the generator motor 1.

Numeral 20 is an AC reactor 21, 21 connected to the internal circuit side of the main transformer 8 for suppressing a fault current.
2, 23 are current transformers installed in the in-house circuit 3, 24, 25
Is a station breaker installed in the station circuit 3, 26 is a station transformer, 27 is a station transformer overcurrent relay, 28 is a station transformer ratio differential relay, 29 is a station power supply bus, and 30 is a circuit breaker.

Further, 31 is an excitation transformer for self-excitation, 3
2 is a self-excitation excitation circuit breaker, 33 is another excitation circuit for excitation, 34 is another excitation circuit breaker, 35 is an automatic voltage regulator that controls the excitation current via a thyristor excitation device 36,
37 is a field breaker installed in the excitation circuit 4, 38 is a contactor that is closed when the field breaker 37 is open, and 38 is open when the field breaker 37 is closed.
Reference numeral 9 is a field winding of the generator motor 1, and 40 is a field discharge resistance.

Next, the operation will be described. First, when an accident occurs in the main circuit 2 of the generator motor 1, the overcurrent relay or the ratio differential relay detects the occurrence of the accident from the current flowing in the main circuit 2. More specifically, when an accident occurs between the current transformer 7 and the current transformer 14 or between the current transformer 7 and the current transformer 22, the transformer overcurrent relay 9 or the transformer ratio. At least one of the differential relays 10 detects the occurrence of an accident from the current flowing in the main circuit 2. When an accident occurs between the current transformer 13 and the current transformer 15, the generator overcurrent relay 17 or the generator ratio differential relay 18
At least one of them detects the occurrence of an accident from the current flowing through the main circuit 2.

When any of the transformer overcurrent relay 9, the transformer ratio differential relay 10, the generator overcurrent relay 17 or the generator ratio differential relay 18 detects the occurrence of an accident, a protection circuit (not shown) is provided. Operates to trip the power transmission breaker 6, the generator breaker 16 and the field breaker 37 at the same time. As a result, the fault current generated in the main circuit 2 is cut off, and the exciting current supplied to the field winding 39 of the generator motor 1 is cut off.

Next, when an accident occurs in the in-house circuit 3 of the generator motor 1, for example, when an accident occurs between the current transformer 21 and the current transformer 23, the in-house transformer overcurrent relay 27 or the in-house transformer. At least one of the power ratio differential relays 28,
The occurrence of an accident is detected from the current flowing through the in-house circuit 3. When at least one of the in-plant transformer overcurrent relay 27 and the in-plant transformer ratio differential relay 28 detects the occurrence of an accident, a protection circuit (not shown) operates and the in-house circuit breaker 2
Trips 4 and 25 at the same time. As a result, the fault current generated in the in-house circuit 3 is cut off.

Here, the AC reactor 20 is connected to the internal circuit 3.
However, if an accident occurs between the AC reactor 20 and the in-house transformer 26, a fault current will flow into the in-house circuit 3 from both the power system and the generator motor 1. The fault current flowing through the in-house circuit 3 becomes very large. Therefore, in order to cut off the accident current, it is necessary to increase the breaking capacity of the on-site circuit breaker 24. Therefore, the on-site circuit breaker 24 is suppressed by suppressing the accident current.
An AC reactor 20 is installed in the in-house circuit 3 in order to reduce the breaking capacity.

As for the control of the generator motor 1, when the self-excited operation cannot be performed such as starting, electric braking, initial excitation, initial charging, etc., the excitation circuit breaker 34 is closed and the excitation circuit breaker 32 is opened. , Receives the electric power from the excitation transformer 33 and performs another excitation operation. On the other hand, when the self-excited operation can be performed, the excitation breaker 32 is closed and the excitation breaker 34 is opened to receive the electric power from the excitation transformer 31 to perform the self-excited operation.

In the above-mentioned conventional example, the plant control device of the pumped storage power plant, which is composed of one generator / motor, has been described. Hereinafter, the plant control device of the pumped storage power plant, which is composed of two generator / motors, will be described. . FIG. 8 is a single-line connection diagram showing another conventional example of a plant control device. In the figure, 51a and 51b are generator motors for pumped-storage power generation, 5
2a is a main circuit of the generator motor 51a, 52b is a main circuit of the generator motor 51b, 53a is an exciting circuit of the generator motor 51a, and 53b is an exciting circuit of the generator motor 51b.

Further, 54 is a power transmission line connecting the main circuits 52a and 52b to the power system, 55 is a power transmission breaker, and 56 is an inspection in which one end is connected to the power plant side of the power transmission breaker 55 and the other end is grounded. Ground disconnecting switches, 57a and 57b are high-side disconnectors, 58a and 58b are main transformers installed in the main circuits 52a and 52b, 59a and 59b are phase-reversing disconnectors for power generation operation, and 60a and 60b. Is a phase inversion disconnector for pumping operation, 61a and 61b are generator breakers, and 62a and 62b are electrical brake disconnectors that short-circuit the terminals of the generator motors 51a and 51b, respectively.

63a and 63b are field windings 65a and
A thyristor exciting device for supplying an exciting current to 65b, 64
a and 64b are field breakers installed in the excitation circuits 53a and 53b, respectively, and 65a and 65b are field windings of the generator motors 51a and 51b, 66a, 66b and 67a, respectively.
67b is a disconnecting switch for starting, and 68 is a thyristor starting device.

Next, the operation will be described. First, the procedure for stopping the generator motor will be described. For example, when the generator motor 51a is stopped (the explanation is omitted because the stop of the generator motor 51b is also the same), first, the control circuit (not shown) opens the generator circuit breaker 61a, and at the same time, the thyristor excitation device 63a. Is controlled to zero the exciting current supplied to the field winding 65a.

A control circuit (not shown) closes the electric brake disconnector 62a to short-circuit the terminals of the generator motor 51a, and then controls the thyristor excitation device 63a so that the generator motor 51a is supplied with the rated current. Exciting current that flows is supplied to the field winding 65a to apply the electric brake. As a result, the generator motor 51a is stopped.

Next, the procedure for synchronously starting the generator motor will be described. For example, when synchronously starting the generator motor 51a with the generator motor 51b, the control circuit (not shown) first causes the electric brake disconnector 62b and the starter disconnector 67b.
Also, the phase inversion disconnectors 59b and 60b are opened, and the generator breaker 61b and the starting disconnector 66b are closed.

A control circuit (not shown) opens the electric brake disconnecting switch 62a, the generator breaker 61a, the starting disconnecting switch 66a, the phase reversing disconnecting switch 59a, and the grounding disconnecting switch 56, and the phase reversing disconnecting switch 60a. , The starting disconnector 67a, the high-side disconnector 57a, and the power transmission breaker 55 are turned on. And
A control circuit (not shown) turns on the field breakers 64a and 64b and performs synchronous start excitation on the thyristor excitation device 63.
A command is given to a and 63b to supply an exciting current to the field windings 65a and 65b.

Then, in this state, the generator motor 51b is gradually accelerated by the pump turbine, so that the generator motor 51b is supplied from the generator motor 51b through the following power supply route.
Power is supplied to a to accelerate the generator motor 51a.・ Power supply route Generator motor 51b → Generator breaker 61b → Starting disconnector 66b → Starting disconnector 67a → Generator motor 51a

When the speed of the generator motor 51a reaches the synchronous speed, the control circuit (not shown) causes the generator motor 51a to move.
The generator circuit breaker 61a is synchronously closed and the generator circuit breaker 61b is opened in synchronization with a and the power transmission line side. As a result, the synchronous starting of the generator motor 51a is completed and the pumping operation is started, while the generator motor 51b is stopped.

[0020]

Since the conventional plant control device is constructed as described above, when an accident occurs in the main circuit 2 of the generator motor 1, the fault current is generated by the power transmission breaker 6 and the generator breaker 16. Is interrupted (see FIG. 7), but in the event of an accident between the generator circuit breaker 16 and the generator motor 1, not only the accident current flowing from the generator motor 1 into the main circuit 2 but also the accident current from the power system is detected. Since there is an inflow, there is a problem that the generator circuit breaker 16 having a large breaking capacity must be installed in the main circuit 2. In addition, an on-site circuit breaker 2 installed in preparation for an accident that occurs in the on-site circuit 3 of the generator motor 1.
Although the AC reactor 20 is installed in the in-house circuit 3 in order to reduce the breaking capacity of the AC reactor 4 (see FIG. 7), the equipment cost for installing the AC reactor 20 increases and
You have to secure a place to install the C reactor 20,
There is also a problem that a large merit cannot be obtained even if the breaking capacity of the in-house circuit breaker 24 is reduced. Furthermore, when controlling the generator motor 1 (see FIG. 7), there are cases where self-excited operation can be performed and cases where self-excited operation cannot be performed. there were.

When the generator motor is stopped (see FIG. 8), the electric brake disconnectors 62a and 62b for short-circuiting the terminals of the generator motor must be installed for each generator motor 51a and 51b. However, there was also the problem of becoming expensive. Further, when the generator motors are synchronously started (see FIG. 8), two sets of starter disconnecting switches 66a, 66b, 67a, 67b for supplying electric power to the synchronous generators are provided for each generator motor 51a, 51b. There is also a problem that the equipment cost becomes expensive.

The present invention has been made to solve the above problems, and an object thereof is to obtain a plant control device capable of reducing the breaking capacity of a generator breaker and simplifying the device. To do.

[0023]

When a fault is detected by the fault detecting means, the plant control device trips the power transmission breaker and the field breaker and completes the trip. After that, the generator breaker is tripped.

In the plant control apparatus according to the second aspect of the present invention, when the accident is detected by the accident detecting means, the power transmission breaker is tripped and the command value for making the exciting current zero is set. It is output to the means and the generator breaker is tripped after the trip of the power transmission breaker is completed.

In the plant control apparatus according to the third aspect of the present invention, when an accident is detected by the accident detecting means, the power transmission breaker and the generator breaker are tripped, and after the trip is completed, the plant breaker is turned on. It was designed to trip.

In the plant control device according to the fourth aspect of the present invention, the excitation transformer connected to the in-house circuit and the power supplied from the excitation transformer are supplied to the field winding of the generator motor. The exciting circuit of the generator motor is constituted by an exciting current control means for controlling the exciting current based on the command value.

According to a fifth aspect of the present invention, in the plant control apparatus, when stopping the plurality of generator motors, the ground disconnecting switch is turned on after the trip of the power transmission breaker and the field breaker is completed, and the plurality of generator motors are closed. The electric braking current is supplied to the field windings to control the electric braking.

The plant control apparatus according to the sixth aspect of the present invention outputs a command value to the effect that the exciting current should be zero to the exciting current control means, while disconnecting the ground after the trip of the power transmission breaker is completed. The electric brake is applied by controlling the exciting currents supplied to the field windings of the plurality of generator motors.

According to the seventh aspect of the present invention, the plant control device supplies an exciting current to the field windings to the extent that rated currents flow through a plurality of generator-motors.

In the plant controller according to the present invention, a mechanical brake applying means for stopping the generator motor by a mechanical brake is provided for each generator motor.

According to a ninth aspect of the present invention, there is provided a plant control device in which, when one of the two generator motors is synchronously started, the power transmission breaker is opened and the generator breaker and the field interrupter are opened. Circuit breaker control means for turning on the device, and 2
An exciting current supply means for supplying an exciting current to each field winding of each generator motor is provided, and the speed of the other generator motor is accelerated until the speed of the generator motor that starts synchronously reaches the synchronous speed. It is a thing.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. Embodiment 1. 1 is a single line connection diagram showing a plant control apparatus according to Embodiment 1 of the present invention.
1 is a generator motor for pumped-storage power generation, 2 is a main circuit of the generator motor 1, 3 is a local circuit, 4 is an excitation circuit of the generator motor 1, 5 is a transmission line that connects the main circuit 2 of the generator motor 1 to an electric power system,
Reference numeral 6 is a power transmission breaker, and 7 is a current transformer installed on the main transformer side of the power transmission breaker.

Reference numeral 8 is a main transformer installed in the main circuit 2 of the generator motor 1, 9 is a transformer overcurrent relay (accident detection means) for detecting an accident based on the current detected by the current transformer 7, 10 Is a transformer ratio differential relay (accident detection means) for detecting an accident based on the current detected by the current transformers 7, 14, 22; 11 is a phase inversion disconnector for power generation operation;
Is a phase inversion disconnector for pumping operation, 13, 14 and 15 are current transformers installed in the main circuit 2 of the generator motor 1, 16 is a generator circuit breaker installed in the main circuit 2 of the generator motor 1, 17 Is a generator overcurrent relay (accident detection means) that detects an accident based on the current detected by the current transformer 13, and 18 is a generator that detects an accident based on the current detected by the current transformers 13 and 15. A ratio differential relay (accident detection means) 19 is an electric brake disconnector that short-circuits the terminals of the generator motor 1.

Numerals 21, 22 and 23 are current transformers installed in the in-house circuit 3, 24 and 25 are in-house circuit breakers installed in the in-house circuit 3, 26 is an in-house transformer, and 27 is a current transformer. In-house transformer overcurrent relay (accident detection means) that detects an accident based on the current, 28 is an in-house transformer ratio differential relay (accident detected based on the current detected by the current transformers 21 and 23). (Detection means), 29 is a power supply bus in the office, and 30 is a circuit breaker.

33 is an excitation transformer for external excitation, 34 is an excitation breaker for external excitation, 35 is an automatic voltage regulator (excitation current control means) for controlling the excitation current via a thyristor excitation device 36, 36 Is a thyristor excitation device (excitation current control means), 37 is a field breaker installed in the excitation circuit 4, and 38
Is closed when the field breaker 37 is open,
A contactor which is opened when the field breaker 37 is closed, 39 is a field winding of the generator motor 1, and 40 is a field discharge resistance.

FIG. 2 is a block diagram showing a protection circuit of the plant control device according to the first embodiment.
71 is a transformer overcurrent relay 9 and a transformer ratio differential relay 1
0, the OR circuit (circuit breaker control means) that outputs a trip command when any of the generator overcurrent relay 17 or the generator ratio differential relay 18 detects an accident, and 72 is a trip command from the OR circuit 71. Is output, a system breaker circuit (circuit breaker control means) that trips the power transmission breaker 6 and the field breaker 37, and a generator 73 that trips the generator breaker 16 after the trip by the system breaker circuit 72 is completed. It is a cutoff circuit (circuit breaker control means).

Reference numeral 74 is a logical sum circuit (circuit breaker control means) that outputs a trip command when either the local transformer overcurrent relay 27 or the local transformer ratio differential relay 28 detects an accident, and 75 is a logical sum circuit 74. When a trip command is output from the power transmission breaker 6, the generator breaker 16 and the field breaker 37, the grid / generation breaker circuit (breaker control means), 76 is a trip by the grid / generation breaker circuit 75. This is an internal circuit breaker (circuit breaker control means) that trips the internal circuit breaker 24 after completion of the above.

Next, the operation will be described. First, when an accident occurs in the main circuit 2 of the generator motor 1, the overcurrent relay or the ratio differential relay detects the occurrence of the accident from the current flowing in the main circuit 2. More specifically, when an accident occurs between the current transformer 7 and the current transformer 14 or between the current transformer 7 and the current transformer 22, the transformer overcurrent relay 9 or the transformer ratio. At least one of the differential relays 10 detects the occurrence of an accident from the current flowing in the main circuit 2. When an accident occurs between the current transformer 13 and the current transformer 15, the generator overcurrent relay 17 or the generator ratio differential relay 18
At least one of them detects the occurrence of an accident from the current flowing through the main circuit 2.

When any of the transformer overcurrent relay 9, the transformer ratio differential relay 10, the generator overcurrent relay 17 or the generator ratio differential relay 18 detects the occurrence of an accident, the OR circuit 71 is activated. A trip command is output to the system interruption circuit 72. When the trip command is received from the OR circuit 71, the system interruption circuit 72 causes the power transmission breaker 6 to operate.
Also, the field breaker 37 is tripped at the same time to shut off the fault current flowing from the power system to the fault point of the main circuit 2 and shut off the exciting current supplied to the field winding 39 of the generator motor 1.

Then, the system interruption circuit 72 makes the power transmission breaker 6
When the trip of the field breaker 37 is completed, the power generation breaker circuit 73 trips the generator breaker 16 to cut off the fault current flowing from the generator motor 1 to the fault point of the main circuit 2. As a result, all the fault currents generated in the main circuit 2 are cut off as in the conventional case, but according to the first embodiment, the power transmission breaker 6 and the field breaker 37.
Since the generator circuit breaker 16 is tripped after completing the above trip, the generator circuit breaker 16 does not need to interrupt the accident current flowing from the power system,
As a result, it is possible to reduce the breaking capacity of the generator breaker 16 as compared with the conventional one (the generator breaker 16 only needs to have a breaking capacity capable of interrupting a fault current flowing from the generator motor 1).

In the first embodiment, since the trip of the generator breaker 16 is performed after the trip of the power transmission breaker 6 is completed, the trip operation is slightly delayed as compared with the conventional generator breaker 16. Since the trip operation time of the circuit breaker 6 is several cycles, the delay of the trip operation is about several tens of milliseconds even if the delay of the interruption circuit is taken into consideration, and there is no problem in protecting equipment and the like.

Next, when an accident occurs in the in-house circuit 3 of the generator motor 1, for example, when an accident occurs between the current transformer 21 and the current transformer 23, the in-house transformer overcurrent relay 27 or the in-house transformer. At least one of the power ratio differential relays 28,
The occurrence of an accident is detected from the current flowing through the in-house circuit 3. When at least one of the in-plant transformer overcurrent relay 27 and the in-plant transformer ratio differential relay 28 detects the occurrence of an accident, the OR circuit 74 outputs a trip command to the grid / power cutoff circuit 75.

When a trip command is received from the logical sum circuit 74, the system / power generation interruption circuit 75 trips the power transmission breaker 6, the generator breaker 16 and the field breaker 37 at the same time, and the power system and the power generation are generated. The fault current flowing from the electric motor 1 to the fault point of the internal circuit 3 is cut off, and the exciting current supplied to the field winding 39 of the generator motor 1 is cut off.
Then, when the system / power generation cutoff circuit 75 completes the trip of the power transmission breaker 6 and the generator breaker 16, etc., the internal cutoff circuit 76 trips the internal circuit breaker 24.

As a result, all the fault currents generated in the in-house circuit 3 are cut off as in the conventional case, but according to the first embodiment, the power transmission breaker 6 and the generator breaker 16 are provided. Since the internal circuit breaker 24 is tripped after completing the trip of the internal circuit breaker 2
No. 4 eliminates the obligation of interrupting the accident current flowing from the power system and the generator motor 1, and as a result, reduces the interrupting capacity of the on-site circuit breaker 24 without installing the AC reactor 20 unlike the conventional one. You can

Next, the control of the generator motor 1 will be described. In the conventional case, the excitation breakers 32 and 34 are appropriately controlled to switch between the self-excited operation and the separately-excited operation, but in the first embodiment, when the generator motor 1 is operated, the excitation motor is always excited. It receives electric power from the transformer 33 and operates separately. As a result, the excitation transformer 31 for self-excitation and the excitation breaker 32 are not required, and the device is simplified.

Embodiment 2 In the first embodiment, when interrupting the fault current, the field breaker 37 is tripped,
Although the one in which the exciting current supplied to the field winding 39 of the generator motor 1 is cut off is shown, the automatic voltage regulator 35 controls the thyristor exciting device 36 to supply the field winding 39 of the generator motor 1. The exciting current may be set to zero, and the same effect as that of the first embodiment can be obtained.

Embodiment 3. FIG. 3 is a single line connection diagram showing a plant control device according to Embodiment 3 of the present invention.
In the figure, 51a and 51b are generator motors for pumped-storage power generation, 52a is a main circuit of the generator motor 51a, 52b is a main circuit of the generator motor 51b, 53a is an exciting circuit of the generator motor 51a, and 53b is an exciting circuit of the generator motor 51b. is there.

Further, 54 is a power transmission line connecting the main circuits 52a and 52b to the power system, 55 is a power transmission breaker, and 56 is an inspection in which one end is connected to the power plant side of the power transmission breaker 55 and the other end is grounded. Ground disconnecting switches, 57a and 57b are high-side disconnectors, 58a and 58b are main transformers installed in the main circuits 52a and 52b, 59a and 59b are phase-reversing disconnectors for power generation operation, and 60a and 60b. Is a phase inversion disconnector for pumping operation, and 61a and 61b are generator breakers.

63a and 63b are field windings 65a and
Thyristor exciting device (exciting current control means) for supplying exciting current to 65b, and 64a and 64b are exciting circuits 53a and 5b.
Field breakers installed in 3b, 65a, 65b
Are field windings of the generator motors 51a and 51b, respectively.
Reference numerals a, 66b, 67a, 67b are disconnecting switches for starting, and 68 is a thyristor starting device. Incidentally, FIG. 4 is a flowchart showing the operation of the plant control apparatus according to the third embodiment of the present invention.

Next, the procedure for stopping the generator motors 51a and 51b will be described. First, a control circuit (switch operation means) (not shown) trips the power transmission breaker 55 to perform a process of disconnecting the generator motors 51a and 51b from the power system (step ST1). Then, a control circuit (switch operating means) (not shown) controls the field circuit breakers 64a and 64b.
To shut off the exciting current supplied to the field windings 65a and 65b to lower the terminal voltage of the generator motors 51a and 51b (step ST2).

Then, when the terminal voltage of the generator motors 51a and 51b drops to the residual voltage, the control circuit (switch operating means) (not shown) turns on the grounding disconnecting switch 56 for inspection (step ST3). Thereby, the generator motor 51a,
Since it is equivalent to short-circuiting the terminal of 51b,
By turning on the field breakers 64a and 64b, the field winding 65a,
If the exciting current is supplied to 65b, the generator motors 51a, 5
A short-circuit current will flow from 1b toward the grounding disconnector 56.

When the ground disconnecting switch 56 is turned on, a control circuit (electric brake applying means) not shown turns on the field breakers 64a and 64b (step ST4). Then, the thyristor exciting devices 63a and 63b are controlled to supply an exciting current to the field windings 65a and 65b to the extent that a rated current flows through the generator motors 51a and 51b, and an electric brake is applied (step ST5). As a result, the generator motors 51a and 51b are stopped.

As described above, according to the third embodiment, since the electric brake is applied by using the grounding disconnecting switch 56 for inspection which is normally installed, the disconnection for the electric brake is different from the conventional one. The generator-motor 5 is installed without installing the generators 62a and 62b separately for the generator-motors 51a and 51b.
1a and 51b can be stopped. Further, in the case of the third embodiment, the short-circuit current is caused by the main transformers 58a and 58b.
Since it will pass through the generator motor 51a, 51b
Heat is generated not only from the coils of the main transformers 58a and 58b but also from the coils of the main transformers 58a and 58b.
The stop time of a and 51b will be shortened.

Embodiment 4 In the third embodiment, 2
Although the case where the generator motors 51a and 51b are stopped at the same time is shown, the present invention may be applied to the case where one generator motor is stopped and the other generator motor is stopped. The same effect as that of the form 3 can be obtained.

Embodiment 5. In the third embodiment, the generator motors 51a and 51b are stopped by the electric brake. However, the generator motors 51a and 51b are stopped.
A mechanical brake applying means for stopping the motor is provided for each generator motor, and the generator motors 51a, 51a
b may be stopped by a mechanical brake. Accordingly, in the third embodiment, the generator motor 5
Although it was not possible to stop only one generator-motor while both 1a and 51b were operating, according to the fifth embodiment, only one generator-motor can be stopped. That is, the generator motor to be stopped, for example, the generator breaker 61a of the generator motor 51a is opened to naturally decelerate the rotation, and when the rotation is reduced to the specified rotation, the mechanical brake is applied to stop the generator motor 51a. Just do it.

Embodiment 6 FIG. In the third embodiment, when the generator motors 51a and 51b are stopped, the field breaker 64
a, 64b are tripped to generate electric motors 51a, 51b
The field windings 65a and 65b of the thyristor exciting device 63a,
The excitation current supplied to the field windings 65a and 65b of the generator motors 51a and 51b may be controlled to zero by controlling 63b, and the same effect as that of the third embodiment can be obtained.

Embodiment 7 FIG. FIG. 5 is a single line connection diagram showing a plant control apparatus according to Embodiment 7 of the present invention.
In the figure, the same reference numerals as those in FIG. FIG. 6 is a flowchart showing the operation of the plant control device according to the seventh embodiment of the present invention.

Next, the procedure for synchronously starting the generator motor will be described. For example, when the generator motor 51b is synchronously started by the generator motor 51b, first, a control circuit (circuit breaker control means) (not shown) causes the power transmission breaker 55 and the ground disconnector 5 to operate.
6. The starting disconnector 67a, the phase inversion disconnector 59a, the starting disconnector 67b and the phase inversion disconnector 60b are opened (step ST11).

Then, a control circuit (circuit breaker control means) (not shown) includes a generator breaker 61a, a field breaker 64a, a phase inversion disconnector 60a, an extra-high side disconnector 57a, and a generator breaker 6.
1b, the field breaker 64b, the phase inversion disconnecting switch 59b, and the extra-high side disconnecting switch 57b are turned on (step ST12).

Then, a control circuit (excitation current supply means) (not shown) performs synchronous start excitation by the thyristor excitation device 63a,
63b is commanded to supply an exciting current to the field windings 65a and 65b (step ST13).

Then, in this state, the speed accelerating means (not shown) gradually accelerates the generator motor 51b by the pump turbine to supply power from the generator motor 51b to the generator motor 51a through the following power supply route, The generator motor 51a is accelerated (step ST14).・ Power supply route Generator motor 51b → Generator breaker 61b → Phase reversing disconnector 59b → Main transformer 58b → High-side disconnector 57b → High-side disconnector 57a → Main transformer 58a → Phase reversing disconnector 60a →
Generator breaker 61a → generator motor 51a

When the speed of the generator motor 51a reaches the synchronous speed, the control circuit (not shown) causes the generator motor 51a to move.
In synchronization with “a” and the power transmission line side, the power transmission breaker 55 is closed and the generator breaker 61b is opened (step ST15). As a result, the synchronous starting of the generator motor 51a is completed and the pumping operation is started, while the generator motor 51b is stopped.

As described above, according to the seventh embodiment, the electric power is supplied to the generator motors that are synchronously started via the main circuits 52a and 52b of the generator motors. 2 sets of starting disconnectors 66
It is not necessary to install a, 66b, 67a, 67b, and the device configuration can be simplified.

[0064]

As described above, according to the invention of claim 1, when an accident is detected by the accident detecting means, the power transmission breaker and the field breaker are tripped, and after the trip is completed, the power generation is completed. Since it is configured to trip the machine breaker, when determining the breaking capacity of the generator breaker, it becomes possible to determine the breaking capacity without considering the fault current flowing from the power system. As a result, the breaking capacity of the generator breaker can be reduced more than the conventional one.

According to the second aspect of the present invention, when an accident is detected by the accident detecting means, the power transmission breaker is tripped and a command value to the effect that the exciting current should be zero is sent to the exciting current control means. Since it is configured to output and trip the generator breaker after the trip of the power transmission breaker is completed, when determining the breaking capacity of the generator breaker,
The breaking capacity can be determined without considering the fault current flowing from the power system, and as a result, the breaking capacity of the generator breaker can be reduced as compared with the conventional one.

According to the third aspect of the present invention, when an accident is detected by the accident detecting means, the power transmission breaker and the generator breaker are tripped, and the internal circuit breaker is tripped after the trip is completed. Since it has been configured, when determining the breaking capacity of the circuit breaker, it becomes possible to decide the breaking capacity without considering the fault current flowing from the power system and the generator motor. In addition, it is possible to reduce the breaking capacity of the on-site circuit breaker without installing the AC reactor in the in-house circuit.

According to the fourth aspect of the present invention, the excitation transformer connected to the in-house circuit and the excitation current supplied from the excitation transformer to the field winding of the generator motor are commanded. Since the exciting circuit of the generator motor is configured by the exciting current control means that controls based on the value, the self-exciting exciting transformer and the exciting breaker are not required, and the device configuration can be simplified.

According to the fifth aspect of the present invention, when the plurality of generator motors are stopped, the grounding disconnector is turned on after the trip of the power transmission breaker and the field breaker is completed, and the field windings of the plurality of generator motors are closed. Since it was configured to apply an electric brake by controlling the exciting current supplied to each line, it is possible to stop the generator motor without installing an electric brake disconnector for each generator motor, unlike the conventional one. Therefore, there is an effect that the device configuration can be simplified. In addition, since the short-circuit current will pass through the main transformer, heat will be generated not only from the coils of the generator motor but also from the coils of the main transformer, and as a result, more dynamic braking than conventional ones will occur. There is also an effect that the effect is increased and the stop time of the generator motor is shortened.

According to the sixth aspect of the present invention, the command value to the effect that the exciting current should be zero is output to the exciting current control means, while the grounding disconnector is turned on after the trip of the power transmission breaker is completed. Since it is configured to apply the electric brake by controlling the exciting currents supplied to the field windings of a plurality of generator motors, an electric brake disconnecting switch is installed for each generator motor like the conventional one. It becomes possible to stop the generator motor without doing so, and there is an effect that the device configuration can be simplified. In addition, since the short-circuit current will pass through the main transformer, heat will be generated not only from the coil of the generator motor but also from the coil of the main transformer.
As a result, the effect of dynamic braking becomes greater than that of the conventional one, and there is also an effect that the stop time of the generator motor is shortened.

According to the invention of claim 7, the exciting current is supplied to the field winding so that a rated current flows through the plurality of generator-motors, so that the effect of the electric brake can be maximized. effective.

According to the invention of claim 8, the mechanical brake applying means for stopping the generator motor by the mechanical brake is provided for each generator motor. Therefore, when a plurality of generator motors are in operation, There is an effect that only the generator motor of can be stopped.

According to the ninth aspect of the invention, when one of the two generator motors is synchronously started, the power transmission breaker is opened and the generator breaker and the field breaker are closed. Circuit breaker control means and exciting current supply means for supplying exciting currents to the field windings of the two generator motors respectively are provided, and the generator motors of the other generator motors that start synchronously reach the synchronous speed. Since it is configured to accelerate the speed, it is possible to use 2
There is no need to install a set of disconnecting switches for starting, and there is an effect that the device configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a single-line connection diagram showing a plant control device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a protection circuit of the plant control device according to the first embodiment of the present invention.

FIG. 3 is a single line connection diagram showing a plant control device according to a third embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of the plant control device according to the third embodiment of the present invention.

FIG. 5 is a single line connection diagram showing a plant control device according to a seventh embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of the plant control device according to the seventh embodiment of the present invention.

FIG. 7 is a single-line connection diagram showing a conventional plant control device.

FIG. 8 is a single-line connection diagram showing a conventional plant control device.

[Explanation of symbols]

1, 51a, 51b Generator motor, 2, 52a, 52b
Main circuit, 3 internal circuits, 4,53a, 53b excitation circuit, 6,55 power transmission breaker, 9 transformer overcurrent relay (accident detection means), 10 transformer ratio differential relay (accident detection means), 16 generators Circuit breaker, 17 generator overcurrent relay (accident detection means), 18 generator ratio differential relay (accident detection means), 24 site breaker, 27 transformer overcurrent relay (accident detection means), 28 plant transformer Ratio differential relay (accident detection means), 33 excitation transformer,
35 automatic voltage regulator (excitation current control means), 36, 6
3a, 63b Thyristor excitation device (excitation current control means), 37, 64a, 64b field breaker, 39, 65
a, 65b Field winding, 56 Ground disconnecting switch, 58a, 5
8b Main transformer, 71, 74 OR circuit (circuit breaker control means), 72 System break circuit (circuit breaker control means), 73
Power generation cutoff circuit (circuit breaker control means), 75 systems / power generation cutoff circuit (circuit breaker control means), 76 in-house cutoff circuit (circuit breaker control means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kozo Ikeda 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Company (72) Innovator Nobuo Yamaguchi 2-4-1-4 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Inside Hiyani Chunichi Building Toden Design Co., Ltd.

Claims (9)

[Claims] 1. A generator breaker installed in a main circuit of a generator motor, a power transmission breaker connecting the main circuit of the generator motor to a power system, and a field interrupter installed in an exciting circuit of the generator motor. And an accident detection means for detecting an accident that has occurred on the power station side of the power transmission breaker, and when an accident is detected by the accident detection means, while tripping the power transmission breaker and field breaker, A plant control device comprising circuit breaker control means for tripping the generator circuit breaker after the trip is completed. 2. A generator breaker installed in the main circuit of the generator motor, a power transmission breaker connecting the main circuit of the generator motor to a power system, and an exciting current supplied to a field winding of the generator motor. Based on a command value, an excitation current control means, an accident detection means for detecting an accident that has occurred on the power plant side of the power transmission breaker, and the power transmission breaker when an accident is detected by the accident detection means. Circuit breaker control that trips the generator breaker after the trip of the power transmission circuit breaker is completed by outputting a command value to the excitation current control means And a plant control device. 3. A generator circuit breaker installed in the main circuit of the generator motor, a power transmission circuit breaker connecting the main circuit of the generator motor to the power system, and an intermediate portion between the power transmission circuit breaker and the generator circuit breaker. In-house circuit breaker installed in a branched in-house circuit, accident detecting means for detecting an accident occurring in the in-house circuit, and when the accident is detected by the accident detecting means, the power transmission breaker and generator breaker And a circuit breaker control means for tripping the internal circuit breaker after the trip is completed. 4. An excitation transformer connected to the in-house circuit, and supplied with electric power from the excitation transformer to control an excitation current supplied to a field winding of the generator motor based on a command value. The plant control device according to any one of claims 1 to 3, wherein an exciting circuit of the generator motor is configured by the exciting current control means. 5. A main transformer installed in each main circuit of a plurality of generator-motors connected in parallel with each other, a power transmission breaker connecting the main circuits of the plurality of generator-motors to an electric power system, and one end of which is the above-mentioned. A grounding disconnector connected to the power station side of the power transmission breaker and the other end of which is grounded, a field breaker installed in the excitation circuit of each of the generator motors, and when stopping the generator motors. A switch operating means for tripping the power transmission breaker and the field breaker and turning on the grounding disconnector after the trip is completed; and a grounding disconnector being turned on by the switch operating means, A plant control device comprising: an electric brake applying unit that turns on a field breaker and controls exciting currents supplied to the field windings of the plurality of generator motors to stop each generator motor. 6. A main transformer installed in each main circuit of a plurality of generator-motors connected in parallel with each other, a power transmission breaker connecting the main circuits of the plurality of generator-motors to a power system, and one end of which is the above-mentioned. A grounding disconnector connected to the power station side of the power transmission breaker and the other end of which is grounded, and an exciting current control means for controlling the exciting currents supplied to the field windings of the plurality of generator motors based on command values. And when stopping the plurality of generator motors, while tripping the power transmission breaker,
A switch operating means for outputting a command value to the effect that the exciting current should be zero to the exciting current control means, and turning on the ground disconnector after the trip of the power transmission breaker is completed, and the switch. A plant control device including an electric brake applying unit that controls each exciting current supplied to the field windings of the plurality of generator motors when the grounding disconnector is turned on by the operation unit to stop each generator motor. . 7. The plant according to claim 5, wherein the electric brake applying means supplies an exciting current to the field windings such that a rated current flows through the generator motors. Control device. 8. The plant control device according to claim 5, further comprising a mechanical brake applying unit that stops the generator motor by a mechanical brake, for each generator motor. 9. A generator circuit breaker installed in each main circuit of two generator motors connected in parallel with each other, and a power transmission breaker connecting the main circuits of the two generator motors to an electric power system. When the field breakers respectively installed in the excitation circuits of the two generator motors and one generator motor of the two generator motors are synchronously started, the power transmission breaker is opened and the power generator Circuit breaker control means for turning on the machine breaker and the field breaker, exciting current supply means for respectively supplying exciting current to the field windings of the two generator motors, and the speeds of the generator motors to be synchronously started are synchronized. A plant control device comprising: a speed accelerating means for accelerating the speed of the other generator-motor until the speed is reached.