New Scheme of Direct Measurement of Rotary Speed and Power Angle for Hydropower Generator

As one of the important measurement for power system monitoring,the rotary speed of hydro power generator is relatively slow,so that it is difficult to measure fast and accurately.In accordance with this characteristic,this paper puts forward a new scheme of rotary speed measurement.This scheme is able to improve real-time quality and precision of speed measurement through the high precision measurement of the electric angles between teeth.The results of simulation experiment and generating unit experiment verify the effectiveness of the new scheme.At the same time,on the base of the new scheme of rotary speed measurement,the paper further analyses the measurement scheme of hydropower generator's power angle.