JP2000116034A - Power system monitoring control system and control method thereof - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the waiting time when a large number of control outputs are simultaneously requested at the time of an accident, to enable early recovery, and to perform priority control according to the normal / abnormal system state. A main computer 1 sends a manual control request from a man-machine 101 and an automatic control request from an automatic control unit 103.
03 are temporarily registered in the control output request accumulation table 201 in the order of reception. The management control unit 103 refers to the priority order definition table 202 for a plurality of control requests waiting in the accumulation table 201, determines the highest priority in the order of reception, and performs control output in the order of the highest priority. As a result of the determination, the control output with a relatively low priority is in a waiting state, so check whether the waiting time has exceeded the end time or whether the same control output is in a duplicate waiting state, and discard unnecessary control requests. I do. The priority and end time are different for normal and abnormal times,
It is set based on the control response time (permissible time from request to execution) of each facility to be controlled, and is switched according to the system state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system monitoring and control system, and more particularly to a priority control system when a plurality of control outputs are required at the same time.

[0002]

2. Description of the Related Art Power system equipment is increasing and becoming more complicated year by year, and the processing of a power system monitoring and control system for monitoring and controlling the power system equipment is becoming more complicated. The power system monitoring and control system performs state monitoring and control output for local facilities such as a circuit breaker, a transformer, a transmission line, a distribution line, a generator, and a relay that constitute the power system. In this system, when simultaneous output requests are issued for a plurality of control outputs, priority control is performed.

FIG. 7 is a schematic diagram showing an example of a conventional priority control process. There are requested control processes A to X, and the control output from each control process is registered in the control output request waiting table 701 in the order of reception. Next, the requested control is output by the control output process 702. When a plurality of control outputs are requested at the same time, the control outputs are performed in the order of registration, in the example shown in the figure, in the order of control processes B, X, and A.

As an example of priority control outside the registration order, in the example disclosed in Japanese Patent Application Laid-Open No. 58-123327, when the demand exceeds the maximum supply capacity, the order of circuit breakers to be operated according to the priority is determined. ing. Also, JP-A-63-217926
No. 2 compares the target system state with the current system state, and preferentially selects the automatically operable circuit breaker of the system whose state is changing.

[0005]

In the conventional priority control in the power system monitoring and control system, control output is performed in the order of reception or by specifying the system to be preferentially interrupted from the load or system state. Such a conventional priority method has the following problems.

In the priority control in the order of reception, if a large number of control outputs are requested at once when a plurality of accidents occur simultaneously due to a natural disaster or the like, the output processing is performed on a first-come, first-served basis. Output is delayed.

Further, Japanese Patent Application Laid-Open Nos. 58-123327 and 63-21
The priority control of 7926 can respond to a specific abnormal situation but cannot be applied to a different abnormal situation. That is, the priority control is not widely applicable to various power system abnormalities.

Further, the control requests handled by the power system monitoring and control system are roughly classified into individual operations from a plurality of operators and automatic control by a computer. As a result, timely control cannot be performed. Generally, the individual operation by the operator is given the highest priority, but in the event of an abnormality, the accident recovery control needs to be given higher priority. But,
In conventional power system monitoring and control systems, there is no consideration of the difference between control that takes precedence in normal (normal) and control that takes precedence in abnormal situations. A system that performs optimally has not been realized.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned problems of the prior art and to ensure the responsiveness required for each of a plurality of control outputs, in particular, a high-speed response of an urgent control output. To provide a priority control method. In addition, a power system monitoring and control system is provided that allows for early recovery of the system in the event of an abnormality and timely system adjustment in the normal state, and realizes stable power supply, taking into account the difference in priority between the normal state and the abnormal state. It is in.

[0010]

SUMMARY OF THE INVENTION The present invention, which achieves the above object, is a control method of a power system monitoring and control system for monitoring and controlling a plurality of facilities constituting a power system from a distance. For a plurality of control outputs to be transmitted, priorities are set according to the permissible time from request to execution of control based on the response characteristics of each target facility,
When requests for a plurality of control outputs occur simultaneously, the priority of each control output is determined according to the priority.

The priorities are set separately for a normal operation when the equipment is in normal operation and for an abnormal operation when an accident or the like occurs.
It is characterized in that an abnormal time is determined, and the priority is set to be suitable for the system state.

Incidentally, the control output includes an individual operation, a schedule control, and a circuit breaker automatic operation. The priority in the steady state is higher in the order of the individual operation, the schedule control, and the circuit breaker automatic operation. The degree is automatic operation of the breaker,
Individual operation and schedule control are set higher in this order.

A power system monitoring and control system to which the above-described method of the present invention can be applied transmits / receives via a communication line to / from a plurality of local facilities constituting a power system and based on information from a man-machine or local facilities. A computer that issues control outputs for operating each facility is provided.As a function of this computer, priority is given to each control output according to the allowable time from the request of control output to the execution based on the response characteristics of each target facility. Priority definition means for setting the degree, control request registration means for accumulating control output requests by a man-machine or an automatic control function in the order of reception, and when the control means reads out the registration means and is waiting for a plurality of control output requests, Priority control management means for referring to the priority order definition and transmitting control outputs in descending order of priority is provided.

[0014] The priority control managing means may be arranged such that when the same control output request is waiting in the control request registering means for the control output request having a relatively low priority and execution of which is in a waiting state. , Wherein the old control output request is canceled.

As a function of the computer, a time limit setting means for setting a monitoring time of each control output according to the permissible time is provided, and the priority control management means executes the execution with the priority being relatively low. When the waiting time of the control output request in which the control output request is in the waiting state is longer than the monitoring time, the control output request is canceled.

Further, the priority order defining means sets priorities separately in a normal state when the equipment is normally operated and in an abnormal state in which an accident or the like occurs, and the priority control managing means includes: It is characterized in that a steady / abnormal state of the target equipment is determined, and priorities of a plurality of standby control outputs are determined with reference to a priority corresponding to the result.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an overall configuration of a power system monitoring and control system according to an embodiment of the present invention. This system executes on-line remote monitoring and control of local facilities (circuit breakers, transformers, transmission lines, distribution lines, generators, relays, etc.) in an electric power system, and includes man-machines 101-1 to 101-n and a main computer. 102, an information transmission apparatus 105, which transmits a control output (downlink information) to an information transmission apparatus 107 of a local facility via a communication line 106, and receives uplink information such as a state of the local facility and a relay signal.

The control output of the power system monitoring and control system is:
CRT (1-n) reflecting the system status by the operator
, An individual control for selecting a local facility and requesting a control output, and an automatic control performed by the automatic control unit 103 of the main computer 102 based on uplink information from the local facility. Individual control is performed by the main computer 1 from each of the man-machines 101.
02. Automatic control includes schedule control that is output at a time set by an operator, automatic operation of a circuit breaker that restores a system state, and periodic control that is output at a fixed time. The control output of these individual control and automatic control is managed by a control management unit 104 in the main computer 102,
The information is transmitted from the information transmission device 105 to operate the local facilities.

FIG. 2 shows an outline of the processing of the main computer according to this embodiment. When a control output is requested by each of the automatic and manual control processes A to X, the control output request accumulation table 20
1 is registered. Here, three control outputs, ie, the control output A requested by the control process A, the control output B requested by the control process B, and the control output X requested by the control process X are simultaneously requested. It is assumed that the output X and the control output A are registered in the control output request accumulation table 201 in this order.

The control management processing unit 104 determines the priority order according to the priority order definition table 202 and the control waiting time monitoring table 203 as described later, and changes the output order of the control output A, the control output B, and the control output X. The information is stored in the control output order table 204, and the control output is performed via the information transmission device 105. The waiting time of the control request is counted from the time of each reception.

FIG. 3 shows the structure of the priority order definition table.
(A) shows an example in a steady state, and (b) shows an example in an abnormal state. In the priority definition table 202, a priority P is set for each control request output such as an individual operation, a schedule control, and a circuit breaker automatic operation. Regular priority P (A
i) is an individual operation P (A1)> schedule control P (A
2)> Circuit breaker automatic operation P (A3)> The priority P (Bi) at the time of abnormality is determined by the automatic
(B1)> Individual operation P (B2)> Schedule control P
(B3) <...

Here, the judgment between the normal state and the abnormal state is based on an accident judgment flag managed by the main computer 102 for each facility on the system. In the power system shown in FIG. 1 as an example, when the breaker of the distribution line changes from “on” to “off”, the computer 102 receives the uplink information indicating the “off” state of the breaker. At the same time, when an accident in the distribution line of this system, for example, a relay signal for ground fault detection is received as uplink information, the computer 102 sets an accident determination flag on the distribution line (or circuit breaker) from a combination of both information. In addition, when the accident determination flag is set and the distribution line changes from power failure to charging, the accident determination flag is reset.

FIG. 4 shows the configuration of the control waiting time monitoring table. In the control waiting time monitoring table 203, there is no distinction between a normal time and an abnormal time, and a monitoring time T, that is, an overtime of the waiting time is set for each control request output. Here, the individual operation T (1) <the schedule control T
(2) <Automatic circuit breaker operation T (3) <.

The priority P and the monitoring time T in the present embodiment are set based on the response time (permissible time from control output request to execution) required for control of each control object.
FIG. 5 shows an example of a response time for each control output. The control response time t in the constant state (a) is equal to the individual operation t (A1) <
Schedule control t (A2) <automatic circuit breaker t (A
3) The response time is shortened in the order of <. FIG.
The priority of (a) is determined in ascending order of the control response time.

On the other hand, the control response time t at the time of abnormality shown in FIG. 5 (b) is calculated as follows: Automatic circuit breaker operation T (B1) <individual operation T (B2).
<Schedule control T (B3) <..., So that the priorities are in the order shown in FIG.

The monitoring time T in FIG. 4 is a control response time t of each control output, and is set to a longer time of a steady state or an abnormal state. This makes it possible to cope with both normal and abnormal system states. Of course, it is also possible to set separately for a normal time and an abnormal time.

FIG. 6 is a flowchart showing a control management processing procedure according to this embodiment. The control management unit 104
It starts when a control request is registered in the control output request accumulation table 201. First, referring to the accumulation table 201, it is determined whether there are a plurality of waiting control requests (s601). If there is only one control request of the accumulation table 201, the control output is immediately executed (s605).

If there are a plurality of standby control requests, it is determined whether or not the target equipment of the control output is currently in a normal state (s).
602), if normal, refer to the priority definition table 202 to obtain the priority in the normal state (s603). The priority of the plurality of control requests stored in the control output request storage table 201 is determined in the order of reception (s604), and if the priority is the highest among the stored control requests, the control output is executed. (S605). Also, s
If it is determined in step 602 that there is an abnormality, the priority at the time of abnormality is acquired (s606), and the process proceeds to s604.

If it is determined in step s604 that the priority of the control request according to the reception order is not the highest among the standby requests, the control request is set in the wait time after the control request is received and the control wait time monitoring table 203. The monitoring time T (i) is compared (s607). If the waiting time is longer than the monitoring time,
The output request is canceled (s608). As a result, the execution of the control output that has passed the allowable time until the execution and has become untimely is postponed. Note that, among the canceled control outputs, those that have become necessary again are requested again at that time.

On the other hand, if the waiting time is less than the monitoring time in s607, it is checked whether the same control request as the control request exists in the accumulation table 201 (s609). If there is not the same control request, the control output request accumulation table 20
1, if there is the same control request, the request time (acceptance time) is compared (s610), the old request time is discarded, only the new control request is registered, and the process returns to s601, waiting. The above processing is repeated until there is no control request.

In the above description, the priorities are generally different between an abnormal state and a steady state. However, the priorities may be changed according to the type of accident at the time of the abnormal state. For example, the control processing and the equipment to be controlled differ depending on the nature of the abnormality, such as a power failure, a load abnormality, or a water level abnormality in a dam. As a result, priority control adapted to a plurality of abnormal states becomes possible.

According to this embodiment, when there are a plurality of waiting control requests, the control outputs are executed in accordance with the priority order set based on the control response time of the target equipment of the control request, so that the accident recovery can be performed. Can be realized with high response. In addition, the monitoring time (overtime) is set based on the control response time, and the time range in which the control output is valid is limited, so that the control output in which the waiting time is too long and becomes untimely is canceled, The required control output response is improved.

In this embodiment, the priority of the control output is switched between a normal state and an abnormal state. For example, automatic operation of a circuit breaker, which is given the highest priority for recovery from an accident in the event of an abnormality, is irrelevant to an accident in a steady state, and therefore is ranked lower than individual operation or schedule control. As a result, optimal control according to the state of the system becomes possible, processability under normal conditions is improved, and timely control can be realized. In addition, since the priority order is switched by judging the steady state / abnormal state, Japanese Patent Laid-Open No.
There is no unsuitable problem such as a change due to an accident and a change due to work being handled in the same manner as in priority control by changing the system state of a train.

Further, when the control output is in a waiting state, the same control output is repeatedly requested and accumulated in the accumulation table in a redundant manner, thereby deteriorating the processability. However, according to the present embodiment, the same control is checked in a standby control request, and if the control request is duplicated, the old control request is discarded, so that the overhead control is small, and priority control with high responsiveness as a whole can be realized. .

[0035]

According to the present invention, priorities are set based on the response time (permissible time from control request to execution) corresponding to each control output. The time is greatly reduced, and stable power supply can be secured by early restoration.

Further, since the control output whose waiting time exceeds the response time or the same control output which is duplicated is canceled, the processing performance of the system is improved and the priority control with high responsiveness can be realized.

Further, the priorities for the respective control outputs are set separately for the normal state and the abnormal state, and the priorities are switched according to the system state. Therefore, the early recovery in the abnormal state and the timely execution of the normal control in the normal state , And optimum priority control according to the system state can be realized.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a power system monitoring and control system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an outline of processing of a main computer according to one embodiment;

FIG. 3 is a configuration diagram of a priority order definition table.

FIG. 4 is a configuration diagram of a control waiting time monitoring table.

FIG. 5 is a time chart showing an example of a control response time.

FIG. 6 is a flowchart illustrating a control management procedure according to an embodiment;

FIG. 7 is an explanatory diagram showing an outline of processing of a conventional power system monitoring and control system.

[Explanation of symbols]

101: Man machine, 102: Main computer, 103: Automatic control unit, 104: Control management unit, 105, 107: Information transmission device, 106: Communication line, 201: Control output request accumulation table, 202: Priority definition table, 203: control waiting time monitoring table, 204: control output order table.

Claims (7)

[Claims] 1. A control method of a power system monitoring and control system for monitoring and controlling a plurality of facilities constituting a power system from a distance, wherein a plurality of control outputs transmitted from the system to the respective facilities are provided with respective target facilities. Priorities are set in accordance with the permissible time from control request to execution based on the response characteristics of the control output, and when a plurality of control output requests occur simultaneously, the priority of each control output is determined according to the priority. A method for controlling a power system monitoring and control system, characterized in that: 2. The method according to claim 1, wherein the priority is set separately for a normal operation when the equipment is normally operated and for an abnormality when an accident or the like occurs, and the priority is determined. A method for controlling a power system monitoring and control system, characterized in that a normal state / abnormal state is determined and the priority is changed according to the state of the system. 3. The method according to claim 2, wherein the plurality of control outputs include an individual operation, a schedule control, and a circuit breaker automatic operation.
A control method for a power system monitoring and control system, wherein schedule control and circuit breaker automatic operation are set higher in this order, and the priority at the time of abnormality is set higher in order of circuit breaker automatic operation, individual operation and schedule control. 4. A computer which transmits / receives to / from a plurality of local facilities constituting a power system via a communication line and issues a control output for operating each facility based on information from a man-machine or a local facility. In the power system monitoring and control system, as a function of the computer, priority definition means for setting the priority of each control output according to an allowable time from a request for a control output to an execution based on a response characteristic of each target facility, and A control request registration unit that accumulates a control output request by a man-machine or an automatic control function in the order of reception, and reads out the registration unit and, when a plurality of control output requests are on standby, refers to the priority definition and determines a priority. A power system monitoring and control system, comprising priority control management means for transmitting control outputs in descending order. 5. The control control unit according to claim 4, wherein the priority control management unit receives the same control output request from the control request registration unit in response to the control output request whose priority is relatively low and whose execution is in a waiting state. A power system monitoring and control system for canceling an older control output request when waiting. 6. The computer according to claim 4, further comprising a time limit setting means for setting a monitoring time of each control output according to the permissible time, as the function of the computer. A power system monitoring and control system, wherein when the waiting time of a control output request whose execution time is relatively low and the waiting time is longer than the monitoring time, the control output request is canceled. 7. The priority order defining means according to claim 4, 5 or 6, wherein the priority order setting means separately sets priorities in a normal state where the equipment is normally operated and in an abnormal state where an accident or the like occurs. And wherein the priority control management means determines a steady / abnormal state of the target equipment, and refers to a priority corresponding to the result to determine a priority of a plurality of standby control outputs. Power system monitoring and control system.