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Keywords

distribution network static synchronous compensator; voltage dip; voltage overshoot; coordinated control; voltage transient rate of change

Abstract

To solve serious problems such as equipment shutdown caused by voltage dips due to short-circuit faults in distribution networks, a coordinated control strategy employing a distribution network static synchronous compensator (D-STATCOM) based on the voltage transient rate of change is proposed. Firstly, the control of voltage by the traditional control strategy is improved. An undervoltage module is activated when a short-circuit fault occurs in the distribution network, increasing the reactive power output of D-STATCOM to suppress the voltage dip during the fault. At the end of the fault, an overvoltage module is activated to decrease the reactive power output of D-STATCOM, thereby suppressing the post-fault voltage overshoot. On this basis, a transient fast reactive power compensation control is added to improve the dynamic reactive power regulation speed of the D-STATCOM, enabling it to supply or absorb reactive power more rapidly for voltage stabilization. The proposed coordinated control strategy is compared with the conventional control strategy in PSCAD/EMTDC, and the simulation results verify the effectiveness and correctness of the strategy.

DOI

10.19781/j.issn.1673-9140.2025.03.025

First Page

233

Last Page

242,274

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