JPH06205536A - Recovery operation from accident in power system - Google Patents

Abstract

PURPOSE:To make it possible to establish a new recovery target system by connecting electric groups including a thermal power generator electrically unconnected to an upper system bus in sound equipment of a recovery target system to the upper system bus. CONSTITUTION:In order to perform an automatic recovery in an accident occurrence of a wide-area power system, individual thermal power system extraction steps ST12 and ST13 for checking whether electric groups including a thermal power generator electrically unconnected to an upper system bus in sound equipment of a recovery target system exist or not are performed. A thermal power recovery step ST14 for obtaining a system operation to connect the electric groups to the upper system bus is performed according to the outputs of the individual thermal power system extraction steps ST12 and ST13. Further, a recovery target system correction step ST15 for obtaining a new recovery target system which the system operation reflects is performed according to the thermal power recovery step ST14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power system accident recovery operation method for performing automatic recovery when an accident occurs in a wide area electric power system.

[0002]

2. Description of the Related Art FIG. 5 is a flowchart of an operation procedure of a conventional recovery operation method at the time of an accident of a power system, which is shown in, for example, the Institute of Electrical Engineers of Japan, B, Vol.
Is a restoration target grid creation step, ST2 is a healthy grid flow calculation step, ST3 is a restoration method selection step, ST4 is a power failure grid power flow calculation step, ST5 is supportable power calculation step, ST6 is supportable power and load in power failure comparison Step, ST7 is a load disconnection step, ST8 is a sound system power flow correction step, ST9 is a recovery range search step, ST10 is a determination step of whether all the power outage facilities are rescued or all recovery methods are applied, and ST11 is all from the upper voltage class. This is a step of judging whether or not the examination processing has been completed in the voltage class.

Next, the operation of the conventional method will be described with reference to the flowchart of FIG. First, in ST1, about the points that form a loop in the power outage system in order to remove the accident equipment and working equipment from the equipment to be restored from the system that remains in the power outage state after the power re-transmission and to restore to the radial system. Creates a restoration target system with the switch open.

Next, in ST2, the predicted power flow is calculated by the DC calculation method using the predicted load after one hour for the healthy power system equipment on the restoration target system.

In ST3, a restoration method for bringing the system after the accident closer to the restoration target system is selected, and a bus line applicable for restoration is selected on a healthy system.

[0006] In ST4, a load flow is calculated using the predicted load for the power failure system that has become the repair target on the recovery target system to obtain the repair target load.

[0007] In ST5, the bus applicable to the restoration selected in ST3 and the power failure system to be rescued are virtually connected, a unit load is connected in the power failure system, and the power flow distribution (sensitivity) of the power flow calculation result (sensitivity). Calculate the power that can be used for recovery from the coefficient) and the equipment allowance.

In ST6, the load to be rescued obtained in ST4 is compared with the supportable power obtained in ST5. If the supportable power is larger than the load to be rescued, the process proceeds to ST8.
When the power that can be supported is smaller than the load to be rescued, the process proceeds to ST7, and the load is separated according to the priority order.

In ST8, the power flow distribution in the healthy system changes due to restoration of the power outage system, so the power flow distribution is corrected using the sensitivity coefficient obtained in ST5.

[0010] In ST9, the recovery target system is connected to the supportable bus to newly search the recovery range and set it as the recovery determined system. Then, in ST10, if all power outage facilities have been restored, or if all accident recovery methods have been applied, S
If not, the procedure returns to ST3 to select the recovery method again.

Next, in ST11, if the examination processing is completed from the upper voltage class to all voltage classes, a system restoration command procedure is created. If not, the procedure returns to ST3 and the restoration method is selected again.

[0012]

Since the conventional automatic recovery operation method for an electric power system in the event of an accident is constructed as described above, in the healthy equipment of the recovery target system, it is electrically connected to the upper system bus. Even if there is an electric group that does not include a thermal power generator, consideration was not given to the creation of a new restoration target system in which the electric group was connected to the upper system bus and the support power was increased. In addition, the electric group was an unstable system, and there was a risk of dropping out if left unattended.

The present invention has been made to solve the above-mentioned problems, and an electric group including a thermal power generator that is not electrically connected to a higher-level bus in a healthy facility in a recovery target system is provided. By connecting to the upper system bus, the purpose is to obtain an operation recovery operation method for the power system that creates a new recovery target system.

[0014]

According to the present invention, there is provided an electric power group accident recovery operation method including a thermal power generator which is not electrically connected to a host bus of a higher system in a sound equipment of a recovery target system. A single thermal power system extraction step for checking whether or not exists, based on the output of the single thermal power system extraction step, a thermal power system restoration step for obtaining a system operation for connecting the electric group to a bus of an upper system, and the thermal power system. Based on the output of the recovery step, the recovery target system correction step is performed to obtain a new recovery target system in which the system operation is reflected in the recovery target system.

[0015]

According to the present invention, there is provided an electric power system accident recovery operation method, which focuses on sound equipment on a recovery target grid, and which includes an electric group including a thermal power generator that is not electrically connected to a bus of the upper system. If it exists, a new recovery target system in which the electric group is connected to the upper system bus is created.

[0016]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart showing the procedure of a method for operating and recovering from an accident in a power system according to an embodiment of the present invention. The same steps as those in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 1, ST12 is a single-fired power system that extracts an electric group including a thermal power generator that is not electrically connected to a bus of the upper system from the healthy equipment of the recovery target system created in ST1. ST13 is an extraction step, and ST13 is a step of determining the presence or absence of a single thermal power system based on the output result of ST12.

Further, ST14 is a thermal power system restoration step for obtaining a system operation for connecting the electric group to the bus of the upper system based on the output result of ST13, ST15
Is a recovery target system correction step for correcting the recovery target system created in ST1 to a new recovery target system reflecting the system operation obtained in ST14.

FIG. 2 is a block diagram showing an electric power system to which the method of the above embodiment is applied. In the figure, B1 and B2 are upper system buses, B3 and B5 are healthy buses, B4 is an accident bus, and B is an accident bus.
6 is a power failure bus, CB1 to CB3, CB5, CB7, CB
10, CB12, CB14, CB15 to CB17 are closed switches, CB8 and CB9 are open switches, CB
Reference numerals 4, CB6, CB11, and CB13 are switches that are automatically opened when an accident occurs.

L1 to L4 and L6 are sound transmission lines and L
5, L7 is a blackout power transmission line, L8 is a healthy load power transmission line, L9 is a blackout load power transmission line, and G1 is a thermal power generator.

Further, FIG. 3 shows a recovery target system created by the conventional accident recovery operation method, and the hatched portion in the figure shows the accident equipment. Further, FIG. 4 is a recovery target system created in the present invention, and the CB 8 connects an electrical group not electrically connected to the upper system to the upper system in the sound equipment of the recovery target system shown in FIG. The switch which was thrown in for is shown.

Next, the operation of the above embodiment will be described with reference to the flowchart of FIG. 1 and the system diagrams of FIGS. 2, 3 and 4. First, in ST1 of FIG. 1, a recovery target system as shown in FIG. 3 is created from the equipment determined to have a power failure in the system immediately after the accident, excluding the accident equipment and the working equipment. In the case of this example, the power transmission lines L5 and L7, the bus bar B6, excluding the accident facility and the bus line B4, among the power outage facilities in FIG.
The load power transmission line L9 is to be restored.

Next, in ST12 and ST13, ST1
In the sound equipment of the recovery target system as shown in FIG. 3 created in step 3, the electric group including the thermal power generator that is not electrically connected to the upper system bus is extracted. In the case of this example, the thermal power generator G1 and the transmission line L in the sound equipment in FIG.
The electric group including 6, the bus B5, and the load transmission line L8 is extracted.

Next, in ST14, the system operation for connecting the electric group to the bus of the upper system is obtained. That is, by turning on the switch CB8 in the open state in FIG. 3, the electric group is connected to the upper system bus B1.

Next, in ST15, the system operation obtained in ST14, that is, the opening of the switch CB8 is reflected in the recovery target system created in ST1 as shown in FIG. 3, and the support power is increased by the thermal power generator G1. , Create a new recovery target system as shown in FIG.

Then, with respect to the new recovery target system created in ST15, the processes of ST2 to ST11 will be carried out in the same manner as in the case of the prior art.

Example 2. In the first embodiment, the connection to the upper system bus is made by inputting the transmission line CB. However, in the case where the bus inside the power plant is a double bus composed of Kotsu, the connection to the upper system bus is made by introducing the bus tie CB, and the upper system is made by inserting the section CB. It is also possible to adopt a method of connecting to the upper system bus by connecting the transmission line CB after switching the connection to the bus line and the connection of the transmission line to the power station.

[0027]

As described above, according to the present invention, whether or not there is an electric group including a thermal power generator that is not electrically connected to the bus of the upper system in the sound equipment of the recovery target system. Based on the output of the independent thermal power system extraction step and the output of the individual thermal power system extraction step, based on the output of the independent thermal power system extraction step, a thermal power system restoration step for obtaining a system operation for connecting the electric group to the bus of the upper system, and the thermal power system restoration step , The recovery target system is reflected in the recovery target system, and the recovery target system correction step is performed to obtain a new recovery target system with increased support power. It is possible to connect the electric group concerned, which is unstable and may drop out, to the upper system bus bar and keep it stable, as well as to increase the That.

[Brief description of drawings]

FIG. 1 is a flowchart showing an operation procedure of an accident recovery operation method for a power system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a power system to which the accident recovery operation method of the above embodiment is applied.

FIG. 3 is a configuration diagram of a recovery target system created by a conventional accident recovery operation method.

FIG. 4 is a configuration diagram of a recovery target system created in the present invention.

FIG. 5 is a flowchart showing an operation procedure of a conventional power system accident recovery operation method.

[Explanation of symbols]

 ST12 Single thermal power system extraction step ST14 Thermal power system restoration step ST15 Recovery target system correction step

Claims (1)

[Claims] 1. When a power system accident occurs, the basic configuration data of the power system and the online input data are input to a computer, and a power outage facility is installed for the system immediately after the accident in which the connection state has changed due to the system accident. Of the power system that outputs the operation procedure that automatically determines the power system to the restoration target system that determines and determines the faulty facility from the power outage facility and excludes the faulty facility and the working facility from the power outage facility immediately after the accident. In the accident recovery operation method, a single thermal power system extraction step of checking whether or not there is an electric group including a thermal power generator that is not electrically connected to the bus of the upper system in the sound equipment of the recovery target system, A thermal power system restoration step for obtaining a system operation for connecting the electric group to a bus of an upper system based on the output of the single thermal power system extraction step; And a recovery target system correction step for obtaining a new recovery target system in which the system operation is reflected in the recovery target system based on the output of the recovery step.