JP3319521B2 - Grid stabilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-system power system stabilizing device for detecting a system instability caused by a system accident or the like occurring in a power system and performing control for maintaining a stable power supply.

[0002]

2. Description of the Related Art FIG. 4 shows a configuration of a two-system system stabilizing device. Each of the system stabilizing devices 1A and 1B includes a central device 2A and 2B, respectively, and a plurality of terminal devices 3A and 3B installed at remote locations. Central device 2A, 2B
Performs control calculations necessary for system stabilization using system information sent from the plurality of terminal devices 3A and 3B via transmission lines, that is, the open / closed state, voltage, current, and device failure state of the circuit breaker. I do. The central units 2A and 2B perform output switching in order to output one of the control calculation results according to the state of the central units. The terminal devices 3A and 3B pull the corresponding circuit breaker when a system fault occurs in accordance with the control calculation result sent from the central devices 2A and 2B via the transmission path, that is, the power supply or load cutoff and turn-on commands. Remove and put in.

FIG. 5 is a diagram showing the configuration of the central units 2A and 2B. The operation units 4A and 4B input system information from a plurality of terminal devices via the input units 5A and 5B, and perform control operations for system stabilization. This control calculation is always executed at a constant cycle. Also, the system information is sent to the automatic monitoring unit 6.
A and 6B, the automatic monitoring units 6A and 6B determine whether the central unit is normal and whether all the terminal units are normal based on the detection result of the device failure information from the terminal device and the diagnosis result of the central device. Output the judgment. In both systems, the output switching units 7A and 7B, which input the determination result of the automatic monitoring unit and the control operation result of the operation unit, respectively, output one of the control operation results according to a predetermined logic. This figure shows the logic of the output switching unit when the system A is a regular system and the system B is a standby system. That is, when both the central unit of the A system and all the terminal devices are normal, the control operation result of the arithmetic unit 4A of the A system is output to the terminal device 3A via the output unit 8A. At this time, the B-system output switching unit 7B is connected to the B-system operation unit 4
The output of B is locked, and the control operation result of A system is output to the terminal device 3B via the output unit 8B under the normal condition of both the central device and all the end devices of B system. On the other hand, if either the central unit of the A system or all the terminal devices are defective, the A
The output of the operation unit 4A of the system is blocked. At this time, the B-system output switching unit 7B outputs the control operation result of the B-system operation unit 4B to B
Both the central device of the system and all terminal devices output to the terminal device 3B under normal conditions. Also, in either system, when either the central unit or all the terminal units are defective, no control calculation result (shutdown command) is output.

Here, the reason why the output switching section outputs one of the calculation results is as follows.
This is to prevent excessive control even when the calculation results are different due to calculation errors of A and 4B. FIG. 2 is a table summarizing the output in each case as described above.
In the column of the conventional method.

[0005]

As shown in the column of the output of the conventional central unit in FIG. 2, in the conventional system stabilizing device, the condition that all the terminal devices are normal is provided in the output switching unit. Even if only one terminal device is defective, it is determined that the relevant line is defective, and the operation immediately changes from two-line operation to one-line operation, and the redundancy (2) that improves the operation rate and reliability.
Series) is lost.

In the conventional configuration, the output switching unit is provided with a condition that the central unit is normal. However, among the failures (failures) of the central unit, depending on the type of the failure, the unit may malfunction or malfunction. Even a light failure that did not result in a failure was judged to be a failure in the relevant series, and the two-series operation was immediately switched to the one-series operation.

Accordingly, the present invention is to solve the above-mentioned problem, and in the case of a terminal device failure, a central device minor failure, or a transmission line failure, two-system operation is performed within a possible range, and the effectiveness of the two-system configuration is improved. It is an object of the present invention to provide a system stabilizing device that makes the most of characteristics.

[0008]

A system stabilizing apparatus according to claim 1 of the present invention is a system stabilizing apparatus having a two-system configuration, wherein system stabilizing information is fetched via a plurality of terminal devices.
A central device that performs a stabilization control operation for performing stable power supply based on the acquired system information, and sends a control command to the terminal device based on the control operation result, and a control command sent from the central device. In a system stabilization device having two systems of a plurality of terminal devices provided corresponding to the central device for controlling a power supply or a load when a system failure occurs based on the system failure of the plurality of terminal devices and the central device, A first series and a second series which determine that the apparatus is defective.
Diagnostic means provided corresponding to the series, determining means for communicating the determination result of the diagnostic means between the two central devices and determining the device states of the central device and the terminal device of both systems, According to the result, when the central unit of the first series and all terminal devices are normal and the central unit of the second series is normal, the first unit
The control command of the central unit of the series is output from the central unit of the first series and the central unit of the second series to the terminal units of the respective series, and when the central unit of the first series and all the terminal apparatuses are normal, the central unit of the second series is output. A first and a second output switching means for outputting the control command of the first series of central devices to the first series of terminal devices only from the first series of central devices when the apparatus is defective.

A system stabilizing apparatus according to a second aspect of the present invention captures system information via a plurality of terminal devices and performs a stabilization control operation for stably supplying power based on the system information taken. A central device that sends a control command to the terminal device based on the control calculation result, and a central device that shuts off a power supply or a load when a system fault occurs based on the control command sent from the central device. A system stabilization device having two systems composed of a plurality of terminal devices, a system failure caused in each system system stabilization device by a failure or a diagnosis that can lead to malfunctions and other minor failures that can lead to malfunctions. First and second series to be distinguished
Diagnostic means provided corresponding to the system; determining means for mutually communicating diagnostic results of the diagnostic means between the two central devices to determine the device states of the system stabilizing devices of the two systems; According to the result of (1), when the system stabilizing device of the first system of the service system has a minor failure and the system stabilizing device of the second system of the standby system has a major or minor failure, the output of the control calculation result of the first system is permitted. When the first system stabilizing device in the service system has a serious fault and the second system stabilizing device in the standby system has a light fault, the first system control output result of the second system is output-permitted.
And output switching means provided corresponding to the second stream.

[0010]

According to a first aspect of the present invention, there is provided a system stabilizing apparatus comprising: a first central unit and all terminal units that are normal; The control operation result of the central unit of the series is output from both series to the terminal device of each series, and the two-series configuration is maintained.

The system stabilizing device according to claim 2 of the present invention is configured such that even if both the system stabilizing device of the normal system and the system stabilizing system fail, if at least one of them is a minor failure, the minor failure side (the regular system) The control operation result of the system stabilizer (priority) is output and the operation is continued.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the system stabilizing device according to the first aspect of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of the central devices 9A and 9B of the present embodiment. In FIG. 1, the same components as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. Output switching unit 10 of central units 9A and 9B of A system and B system
A and 10B input the normal / defective judgment output of the central unit and all the terminal devices from both the self-monitoring units and the other-line automatic monitoring units 6A and 6B, respectively, and control operation results from both the operation units 4A and 4B. Enter

In the output switching units 10A and 10B, the AND circuits 1401A and 1401B determine that the central unit and all terminal units of the own system are normal, and become "1" when the condition is satisfied. The AND circuits 1402A and 1402B determine that the other central devices and all terminal devices are normal, and become "1" when the condition is satisfied. The AND circuits 1405A and 1405B have their own central units and all terminal devices normal, ie, the output of the AND circuits 1401A and 1401B = “1” signal, and the other system terminal or the central unit is defective, ie, the AND circuits 1402A and 1402B. The signal “1” obtained by inverting the output = “0” of the output from the NOT circuits 1403A and 1403B is input, and the condition is satisfied, and the output = “1”.

The AND circuits 1406A and 1406B are connected to both terminals and D by all terminals, the central device is normal, that is, the AND circuit 1
401A, 1401B output = "1", AND circuit 140
2A, 1402B output = “1” is input, and the condition is satisfied and output = “1”.

Next, AND circuits 1407A and 1407B
Is normal for all terminals of other system, central unit is normal and AND circuit 1402
A, 1402B output = “1”, own system central device normal =
The condition is satisfied with the signal “1”, the terminal device failure of one's own system = “0” signal inverted by the knot circuits 1404A and 1404B, and the output = “1”.

As a result, A-system AND circuits 1405A,
The output of the 1406A = "1" signal is the OR circuit 140 of the next stage.
8A is input to an AND circuit 1409A. One input is a cutoff command from the arithmetic unit 4A, which is output to the output unit 8A via the OR circuit 1411A when the condition is satisfied.

The output of the AND circuit 1407A = “1” signal is input to the next AND circuit 1410A, and one input is B
When a cutoff command is input from the arithmetic unit 4B of the system central device 9B and the condition is satisfied, the output unit 8 is routed through the OR circuit 1411A.
A is output to A.

B-system AND circuits 1406B and 1407B
Output = “1” signal is input to the AND circuit 1410B through the OR circuit 1408B of the next stage. One input is a cutoff command from the arithmetic unit 4A of the A system central device 9A,
When the condition is satisfied, the output unit 8 is routed through the OR circuit 1411B.
B.

The output of the AND circuit 1405B = “1” signal is input to the next-stage AND circuit 1409B, and one input receives a cutoff command from the arithmetic unit 4B of the own system, and the OR circuit 1411B of the next stage is input when the condition is satisfied. It is output to the output unit 8B depending on the reason. A table summarizing the output in each case as described above is shown in the column of the new method in FIG.

No. Cases 3 and 11 are all terminals of A system,
The central device is normal and the central device of system B is defective. The B system central device does not output the shutoff command.

No. Cases 12 and 14 indicate that all terminals of the B system are normal and the central device is normal, and that the central device of the A system is defective. The central device of the B system outputs a shutoff command for the B system. The central unit of the A system does not output the shutoff command.

No. Case 7 is all terminals in the A system, the central device is normal, and any of the terminal devices in the B system is defective and the central device is normal. The central device in the A system issues an A system disconnection command, and the B system central device issues an A system shutoff command. Output.

No. Case 13 is a failure of any terminal device of the A system and the central device is normal, all terminals of the B system are normal and the central device is normal, and the central device of the A system issues the B system and the central device of the B system issues a shutdown command of the B system. Output. No. 15 cases are all terminals of both systems, the central device is normal and A system, the central device is A system, B
The system central device outputs an A system cutoff command. In other cases, the above conditions do not exist, and both central units do not output a shutoff command.

From the above, all the terminals of both systems, when the central unit is normal, the shutoff command of the A system is output from the central unit of both systems,
When the central unit is normal due to failure of any of the terminals of the one line and the terminal of the central unit which is normal and the remaining unit is normal, the shut-off command of the normal side of the unit is output from both central units. When the central unit is normal in all the terminals of one system and the central device is defective in the remaining system, a shut-off command is output from the central device on the normal side of the one-system device to the terminal device.

As described above, according to the present invention, all terminals in both systems, when the central device is normal, or all terminals in one system, when the central device is normal and the terminal device in one of the remaining systems is defective and the central device is normal, Since the same shutoff command is output to the terminal devices from the central devices of both systems, the corresponding breaker can be reliably shut off by a plurality of remote terminal devices.

Next, an embodiment of the system stabilizing device according to claim 2 of the present invention will be described with reference to FIG. FIG. 3 is a configuration diagram of the central devices 11A and 11B of the present embodiment, which is applied to a central device of a system stabilizing device having a two-system configuration as shown in FIG. The central units 11A and 11B perform self-diagnosis functions according to the types of failures (failures). The failure diagnosis units 12A and 12B diagnose a major failure that may lead to a device malfunction or malfunction. Light failure diagnosis unit 13 for diagnosing a malfunction that does not lead to malfunction or malfunction) as a light failure.
A and 13B. And those diagnostic units 1
2A, 12B, 13A, 13B failure diagnosis result F11,
F21, F12, and F22 communicate with each other and output switching unit 1
4A and 14B input. The output switching units 14A and 14B determine the state of the device according to the result of the failure diagnosis, and permit or prevent (lock) the output of the control operation results of the operation units 4A and 4B of the own system according to the logic (table). Some cases of switching of the output of the control calculation result will be described.

In both systems, in a state where there is no failure, the control command is output from the service system central unit 11A and the standby system central unit 11A.
B becomes a hot standby. When a failure occurs in the service system (central device 11A), the control output of the service central device is locked on condition that no failure has occurred in the standby system, and the control output of the standby system becomes possible.
If a failure occurs in both the service system and the standby system, control output from the service system central unit is performed if both systems have minor faults, and a minor fault occurs if a single system major fault or single system minor fault occurs. Control output from the generator. In the event of a double system failure, both systems control output is locked and the system goes down.

In the above embodiment, the control command is output only from the one-system side. However, as in the first aspect of the invention, the control command is always output from both systems of the two-system system, and the OR is output. In the same manner, the present invention can be applied to a system having a two-system OR configuration in which control is performed by the above-described method.

Further, in the above embodiment, the range of fault (failure) diagnosis and detection of the heavy fault diagnosis unit and the light fault diagnosis unit is the central unit of the own system. The same can be applied to the case where the terminal system and the communication unit are included in the range of failure diagnosis as a normal system and a standby system including communication means.

As described above, according to the present embodiment, even if a failure occurs in both systems of the stabilization system having the two-sequence configuration, the stabilization control can be performed if the failure content is a minor failure, and the operation rate of the system can be reduced. Can be improved.

[0031]

As described above, according to the present invention, the operating rate of the two-line configuration can be increased, so that a system stabilizer with improved reliability can be obtained. In addition, since the intermittent transmission failure can be accurately detected, a highly reliable system stabilizing device can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a central unit according to a first embodiment of the present invention;

FIG. 2 is a logic table according to the first embodiment of the present invention;

FIG. 3 is a configuration diagram of a central unit according to a second embodiment of the present invention;

FIG. 4 is a configuration diagram of a two-system configuration system stabilization device;

FIG. 5 is a configuration diagram of a conventional central unit.

[Explanation of symbols]

1A, 1B ... system stabilization device, 2A, 2B, 9A, 9
B, 11A, 11B central device, 3A, 3B terminal device, 4A, 4B arithmetic unit, 5A, 5B input unit, 6A,
6B: Automatic monitoring unit, 7A, 7B, 10A, 10B, 11
A, 11B, 14A, 14B ... output switching section, 8A, 8B
... output unit, 12A, 12B ... serious failure determination unit, 13A, 1
3B: Light failure determination unit

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Satoshi Ishibashi 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu plant, Toshiba Corporation (56) References JP-A-4-17522 (JP, A) JP-A-56- 3533 (JP, A) Actual opening 53-119531 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02J 3/00-5/00

Claims (2)

(57) [Claims] 1. System information is obtained via a plurality of terminal devices.
Supply stable power based on system information
Control calculation for stabilization, and based on the control calculation result.
A central device for sending a control command to the terminal device;
When a system fault occurs based on a control command sent from the device
Corresponding to the central unit that controls the power supply or load
Has two systems consisting of a plurality of terminal devices provided
In the system stabilizing device, diagnostic means provided corresponding to a first system and a second system for determining the device failure of the plurality of terminal devices and the device failure of the central device, and a determination result of the diagnosis device. Discriminating means for communicating with each other between the two central devices and discriminating the device states of the central devices and the terminal devices of both systems, and, according to the result of this discriminating device, the central device of the first system and all the terminal devices are normal, When the two central units are normal, the control commands of the first central unit are output from the first central unit and the second central unit to the respective terminal units, and the first central unit and all central units are output. When the terminal device is normal and the second central device is defective, the first command to output the control command of the first central device to a plurality of first terminal devices only from the first central device. And second output switching means. System stabilizing apparatus according to claim. 2. System information is obtained via a plurality of terminal devices.
Supply stable power based on system information
Control calculation for stabilization, and based on the control calculation result.
A central device for sending a control command to the terminal device;
When a system fault occurs based on a control command sent from the device
Corresponding to the central unit that controls the power supply or load
Has two systems consisting of a plurality of terminal devices provided
In the system stabilization system, it corresponds to the first system and the second system in which a fault occurred in each system stabilization device or a serious fault that may lead to malfunction due to diagnosis and other minor faults is determined. Diagnostic means provided as
Discriminating means for mutually exchanging the diagnosis results of the diagnosing means between the two central devices and judging the device status of the system stabilizing devices of both systems; When the standby system is a minor fault and the standby system second system stabilization device is a major or minor fault, the first system control operation result is permitted to be output, and the first system of the service system is stabilized. When the system is a serious fault and the standby system second system stabilization device is a minor fault, it is provided corresponding to the first and second systems for which the output of the second system control operation result is permitted. A system stabilizing device comprising output switching means.