Liu Mingsong

Study on the mechanism of dynamic reactive power reserves in respect of voltage stability

At present, few studies focusing on dynamic reactive power reserves in respect of voltage stability have been reported. In the paper, the definitions of dynamic reactive power sources such as synchronous generators, SVC and STATCOM are proposed firstly. Then the mechanisms of dynamic reactive power reserves of synchronous generators, SVC and STATCOM in respect of voltage stability are studied, respectively. It demonstrated that in steady-state operation, with more generator reactive power output, the static voltage stability and transient voltage stability of power system are better; with less reactive power output of SVC and STATCOM, thats more reactive power reserves, the static voltage stability and transient voltage stability of power system are better.

A dynamic reactive power reserve optimization method to enhance transient voltage stability

Dynamic reactive power reserve of power system is vital to improve transient voltage security. A novel definition of reactive power reserve considering transient voltage security in transient procession is proposed. Participation factor to evaluate reactive power reserves contribution to transient voltage stability is computed through trajectory sensitivity method. Then an optimization model to enhance transient voltage stability is built and a solving algorithm is proposed. Based on an analysis of the transient voltage stability characteristics of East China Power Grid, the effectiveness of the proposed dynamical reactive power reserve optimization approach for improving transient voltage stability of large-scale AC-DC hybrid power systems is verified.