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, that´s more reactive power reserves, the static voltage stability and transient voltage stability of power system are better.