additional positive sequence network的用法和样例：
- The pulse steering circuit so designed solves fairly well the transition between positive sequence and negative sequence.
- A phase A fundamental positive sequence voltage selected unit based on LPF substitutes for the original ip-iq PLL to ensure exact voltage of A phase is selected even in case of imbalance three phase voltage.
- The positive sequence and negative sequence currents of the fault phase are analyzed , the mathematical model of stable fault character of stator winding＇s inter-tttm short circuit are built.
- Considering the imbalance of three phase voltages,a new arithmetic which verifies the generator paralleling based on the synthetic phasor of positive sequence fundamental voltage is proposed.