Control system for automatically switching wide areas of wide area backup power supply of electric power system

Abstract

The invention relates to a control system for automatically switching wide areas of a wide area backup power supply of an electric power system. A main station end comprises a data acquisition unit, a data processing unit and a data sending unit, wherein the data acquisition unit acquires wide area state information and information on each switch of the electric power system; the data processing unit provides a load feeder inter-tripping list of a transformer station; the data sending unit transmits load feeder inter-tripping list to a plant station end; the plant station end is provided witha main control unit which comprises a receiving unit, a detecting unit and a processing execution unit; the receiving unit receives and stores the current load feeder inter-tripping list of the station; the detecting unit detects whether a conventional action condition is satisfied on line; and the processing execution unit switches on a line switch on a backup power supply side first, then cuts off a load feeder required to be cut off, and finally sends 'ready action' information to a main station. The remote control and the remote communication between the main station end and each plant station end are realized through a special communication network of the electric power system. The control system can achieve the effect of realizing 'wide area control' according to 'state information of all electric power systems', and has reliable action processes.

Description

technical field [0001] The invention relates to an automatic control technology of a power system, in particular to a wide-area control system for automatic switching of a wide-area backup power supply of the power system. Background technique [0002] With the continuous expansion of the power grid, it becomes more and more difficult to interrupt the short-circuit current of the regional power grid, and in order to reduce the impact of the electromagnetic ring network on the safety of the power grid, when the higher-level power grid has formed a ring network, the lower-level power grid of the regional power grid will Disconnect the ring and form a radial partition and slice power supply. However, the reliability of the power grid after de-looping is significantly reduced. Therefore, the "backup power automatic switching device" (industry is often referred to as backup power automatic switching or BZT) is used as a "microcomputer control device" in regional power grid substa...

AI Technical Summary

Problems solved by technology

[0041] 5. The backup power supply does not meet the pressure condition, and the automatic switching of the backup power supply should not act

[0042] 6. The automatic switching of the backup power supply should only be activated once, so the equipment needs to use the power supply to automatically switch once to lock the action or increase the charging conditions. Generally, it should be discharged immediately after the action so that the backup cannot be activated again.

[0047] (2) The existing backup power automatic switching strategy is susceptible to interference from local small power sources, resulting in misoperation and refusal accidents

[0048] At present, the fault power-off detection signal of the automatic switching of the backup power supply is generally voltage and current, and a single detection signal will lead to the occurrence of malfunction and refusal of the automatic switching of the backup power supply.

For some substations, the voltage setting value of the power failure is set too low (such as the voltage is set to 30%). When a fault as described in (1) occurs, after DL2 trips, the 110kV2M is not supported by the local unit. If the voltage setting value is set too high (for example, the voltage is set to 70%), the reactive power output of the local power supply will be small, Misoperation occurs when the local reactive power load is heavy

[0049] (3) The existing backup power automatic switching strategy cannot realize coordinated action with the safety control device, resulting in the automatic switching of a large number of backup power sources having to be disabled

The current actual situation is that the backup power automatic switching devices that have been put into use in my country's regional power grids do not have remote locking and wide-area control functions. According to the requirements of the above regulations, the 110kV backup power automatic switching devices related to the stability system must be withdrawn. run

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