JPH09252536A - Power system monitor control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power system monitor control system which can easily perform modificating of a selected load breaking system when changing the constitution state of a power system. SOLUTION: In a power system monitor control system which closes/opens the breaker 24 provided in a power system with the instruction from the computer 1a of a control center 1, the power supply is cut by selecting the specified load out of the loads affected by the software of the computer 1a when supplying power to the affected load thereby restarting it, by performing backup from a sound system to the load being influenced due to the stoppage of power supply when an accident occurs in the specified block of the power system and this accident block is cut off the power system.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a power system monitoring and control system.

[0002]

2. Description of the Related Art For example, in a gas manufacturing plant, electric power is supplied to drive a pump, a compressor, etc. (hereinafter referred to as "load") involved in gas production, but electric power is supplied to a substation room or a load. A circuit breaker or the like is provided in the line to enable the load to be electrically disconnected from the power system at the time of failure or inspection. The circuit breaker and the like are provided on the switchboard of the substation.

By the way, when it is desired to continuously operate a load day and night, it is very convenient to have a system in which a plurality of switchboards can be operated at one place and can be centrally managed. Therefore, recently, an electric power system monitoring control system has been developed which can remotely operate the circuit breaker at the time of failure or inspection.

FIG. 1 is a block diagram of a conventional power system supervisory control system.

An operator stands by at the control center 1 having the computer 1a, and the operator operates the computer 1a by a terminal device (not shown).

Since each of the substation rooms 2-1, 2-2, 2-3 has the same structure, the substation room 2-1 will be described here as a representative. A computer 21, an I / F relay board 22, and a switchboard 23 are installed in the substation room 2-1.
Are provided. The computer 21 is connected to the computer 1a to exchange signals. The I / F relay board 22 is a switchboard 2 based on an instruction from the computer 21.
The circuit breaker 24 in 3 is operated.

As the types of the circuit breaker 24, there are a system circuit breaker provided on a path for supplying electric power to the bus bar and a load circuit breaker provided for each individual load. Both are subject to monitoring / control.

A circuit breaker 24 is provided in the switchboard 23.
The circuit breaker 24 is provided with a circuit breaker panel 25 and a far / direct selection switch 26. When the circuit breaker 24 is turned on / off, the circuit for supplying electric power to the load 27 can be connected / cut off. When the remote / direct selection switch 26 is in the remote mode, the circuit breaker 24 can be turned on / off by an instruction from the computer 1a, and when the remote / direct selection switch 26 is in the direct mode, the circuit breaker can be operated. The on / off operation of 24 cannot be performed by an instruction from the computer 1a, and is directly performed in the substation room 2-1. Further, the circuit breaker panel 25 can connect / disconnect the path for supplying electric power to the load 27 when it is in the operating position, and at the time of inspection or the like, pull out the circuit breaker panel 25 from the casing to the disconnection position. To do.

From the computer 21, the computer 1
Various information regarding the electric power system is reported to a. In the conventional electric power system monitoring and control system, as this information, the current, voltage, electric power, electric energy, etc. in each part of the electric power system, the on / off state of the circuit breaker 24, and the presence / absence of a failure have been reported.

Here, the structure of the electric power system is as shown in FIG. 2, in which the circuit breakers 24a and 24f are open and the circuit breaker 2
4b, 24c, 24d, 24e, 24g, 24h, 24
i and 24j are in the on state, and the bus bar 30 is passed through the feeder 28.
The load 27a, 27b is supplied with electric power from the bus 27 and is driven by the feeder 29.
A case in which electric power is supplied to and driven by c and 27d will be described.

At this time, for example, when an accident occurs in the feeder 28, the protection relay operates to open the circuit breakers 24b and 24c to disconnect the accident section, and then the circuit breaker 24f is instantly turned on. By providing a healthy feeder 29 a bus bar 30
To back up. Such a system has been used conventionally and is referred to herein as an instant switching system.

According to this instantaneous switching system, the loads 27a and 27b that were operating before the accident are temporarily stopped, but they are restarted by the backup by the sound system. However, if a large number of loads are restarted at the same time, the large starting current may cause a voltage drop in the buses 30 and 31, and the loads may stop again.

In order to prevent such a phenomenon, a system which selectively cuts off the load during operation of the instantaneous switching system (hereinafter referred to as "selective load cut-off system") has been conventionally used. In FIG. 2, only two loads 27a and 27b are illustrated as loads receiving power supply from the bus 30, but in reality, many loads are connected, and among the many loads, depending on the difference in importance. There is a load that may be stopped for some time or a load that should be avoided as much as possible. That is, in the selective load shedding system,
When an accident occurs in the feeder 28 and the circuit breakers 24b and 24c are opened, for example, the circuit breaker 24g is opened and then the circuit breaker 24f is turned on. The power supply to the load 27a, which may be set, may be cut off, and the driving of the load 27b, which is desired to be prevented from being stopped, can be guaranteed.

Conventionally, this selective load cutoff system has been constructed by a complicated relay sequence because the number of loads that can be started at the time of instantaneous switching differs depending on the configuration state of the electric power system.

[0015]

The conventional power system supervisory control system as described above has the following problems.

When changing the configuration state of the power system, for example, when adding a load, it is necessary to modify a complicated relay sequence for the selective load cutoff system, and there is a problem that it lacks flexibility. Further, the work of confirming whether or not the selective load shedding system operates properly after the addition is complicated and difficult.

The present invention has been made in view of the above points, and provides a power system monitoring and control system capable of easily modifying a selective load shedding system when changing the configuration state of a power system. With the goal.

[0018]

In order to achieve the above object, the present invention provides a power system supervisory control system for turning on / off a circuit breaker provided in a power system in response to an instruction from a computer of a control center. When a fault occurs in a certain section of the power system and the fault section is disconnected from the power system, the power supply is stopped and the affected load is backed up from the healthy system to protect the affected load. When the power is supplied and restarted, the software of the computer selects a predetermined load from the affected loads to cut off the supplied power.

[0019]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings.

The block diagram of the power system supervisory control system according to the present invention is the same as the conventional block diagram shown in FIG. 1 and will be described with reference to FIG.

An operator stands by at the control center 1 having the computer 1a, and the operator operates the computer 1a by a terminal device (not shown).
The description of each component is the same as the description of the conventional technique, and therefore will be omitted here.

From the computer 21, the computer 1
Various information regarding the electric power system is reported to a. In the electric power system monitoring and control system according to the present invention, as this information, the current, voltage, electric power, electric energy, etc. in each part of the electric power system, the on / off state of the circuit breaker 24 and the presence / absence of a failure, and further the circuit breaker Information on whether 24 is in the operating position or the disconnecting position, information on whether the circuit breaker 24 is in the remote mode or the direct mode, and the presence or absence of a control power source for the circuit breaker 24 are reported. The information reported to the computer 1a is displayed on the terminal device connected to the computer 1a.

Next, the selective load shedding system in the power system supervisory control system according to the present invention will be described.

In the power system monitoring and control system according to the present invention, the information reported from the computer 21 to the computer 1a is used, and the configuration of the power system such as which bus is connected to which load, By inputting into the computer 1a information about which load is a load that may be stopped for a certain amount of time and which load is the load that avoids stopping as much as possible, the selective load cutoff system can be implemented by the computer 1a. It consists of software. That is, since the number of loads that can be activated at the momentary switching differs depending on the configuration state of the power system, the load that the software of the computer 1a operates to cut off when the momentary switching system operates is selected, and only that load is selected. The circuit breaker provided in the path through which power is supplied is opened.

By doing so, as compared with the case where the relay sequence is used as in the conventional case, the modification of the selective load shedding system according to the expansion or the change of the configuration state of the power system can be performed only by changing the software. Therefore, it can be performed easily and inexpensively.

Needless to say, the software that constitutes this selective load shedding system may be made to run on the computer 21.

[0027]

As described above, according to the present invention,
Information about the circuit breaker's distant / direct mode and operation / disconnect position is also reported to the control center computer. For example, when the circuit breaker is in the disconnect position, a command to turn it on is sent and the circuit is disconnected. It is possible to prevent an operation error such that the user thinks that the container is in the on state and performs the subsequent operation. In addition, since the selective load shedding system of the power system monitoring and control system is configured by software, the selective load shedding system can be modified only by changing the software, which allows flexible response and also has a cost reduction effect.

[Brief description of drawings]

FIG. 1 is a block diagram of a power system supervisory control system according to the related art and the present invention.

FIG. 2 is a diagram showing an example of a configuration of a power system.

[Explanation of symbols]

 1 Control Center 1a Computer 2-1, 2-2, 2-3 Substation 21 Computer 22 I / F Relay Panel 23 Switchboard 24 Circuit Breaker 25 Circuit Breaker Panel 26 Far / Direct Selection Switch 27 Load 24a-24j Circuit Breaker 27a- 27d load 28, 29 feeder 30, 31 bus

Claims (1)

[Claims] 1. A power system monitoring and control system in which a circuit breaker provided in a power system is turned on and off by an instruction from a computer of a control center, wherein an accident occurs in a predetermined section of the power system, and the accident section is used as the power source. When the system is disconnected from the system, the power supply is stopped and the affected load is backed up from a healthy system. A power system monitoring and control system, characterized in that a predetermined load is selected from the affected loads to shut off the supply power.