Abstract
Reactive power compensation devices are commonly adopted in power systems to improve voltage stability. The static synchronous compensator (STATCOM) can adjust the reactive power output quickly and smoothly, whilst the mechanically switched capacitor (MSC) is more widely applied due to its low cost. Therefore, in this paper, a new control method is proposed combining both their advantages to improve the short-term voltage stability of the power system. The design of this coordinated control method is aimed at making the STATCOM provide less reactive power in steady state and maximizing the reactive power output in the post-fault transient state. This paper uses power system computer aided design (PSCAD) to carry out the simulation research and has validated the performance of the coordinated control system on voltage stability control in both steady and transient state at a relative low cost.
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