Power system voltage stability control method and system thereof

Abstract

The invention provides a power system voltage stability control method and system. The number of actually should be invested MSC (Mechanical Switching Container) groups is decided based on an STATCOM (Static Synchronous Compensator) and the MSCs according to a reactive power requirement reference value and the rated reactive capacity of an SATCOM and the MSC and the output reactive capacity of the SATCOM is obtained according to a target parameter and the number of the MSC groups. If the reactive power required reference value provided by an automatic voltage control system is a voltage reference value, the reactive power required reference value can be converted into the reactive reference value through outer ring PI control and then capacity distribution composite control can be performed. When the reactive power requirement exceeds a composite output general reactive capacity range of the STATCOM and the MSCs, the reactive compensation capacity is invested farthest and the residual reactive power requirement is provided by a reactive-load compensation equipment of a nearby transformer substation. The power system voltage stability control method and system can improve the composite control stability and improve the STATCOM utilization efficiency.

Description

technical field [0001] The invention relates to the technical field of power system voltage stability control, in particular to a power system voltage stability control method and system thereof. Background technique [0002] In recent years, a number of voltage instabilities in the world have caused large-scale power outages, which have brought huge economic losses and adverse social impacts, and posed severe challenges to the safe and stable operation of power systems. At present, installing reactive power compensation equipment is one of the important methods to improve the voltage stability of power system. However, the traditional compensation is mainly based on mechanical switched capacitors (English abbreviation MSC), which has a slow response speed and is suitable for steady-state control; with the development of power electronics technology and corresponding control technology, static capacitors with fast response and adjustment speed Synchronous compensator (abbre...

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Problems solved by technology

[0004] Aiming at the unstable problem of the combination control of the existing static synchronous compensator and mechanical switching capacitor, the present invention provides a power system voltage stability control method, which can improve the stability of the combined control of static synchronous compensator and mechanical switching capacitor performance, improve the utilization efficiency of static synchronous compensator

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