Asynchronous sampling scheme for active power measurement;

Soft stop control of high-voltage asynchronous motor based on active power close loop;

Under the high harmonics condition,after sampling the voltage and current signals,the real power,reactive power and other electrical parameters can be accurately and real-timely measured by directly implementing phase-shifting netwo.

Balance among real power, reactive power and voltage of the unified power flow controller (UPFC) system is analyzed.

This paper analyzes the reasons which cause the surges, and presents a method of dual closed loop control of real power and current.

In AC circuit,the ratio of effective power and Volt power is called power ratio(the cosine of voltage and current).