From the standpoint of energy conservation,the authors have analyzed the feasibility of employing the power matching characteristics of a wind wheel and an electric generator to fulfil the speed limit protection of a wind turbine generator.

This paper presented the meaning of adding time-limit quick break protection at the branches of the high voltage house substation in detail,and also deduced the boundary conditions for its application.

Choice of FC circuit high voltage contactor time limit current quick break protection value;