基于瞬时无功功率理论的谐波检测方法之误差分析

在电力系统中加装有源电力滤波装置是治理系统谐波的有效措施之一,有源电力滤波装置的谐波电流检测精度直接影响谐波补偿的效果.基于瞬时无功功率理论的谐波电流检测,是目前有源电力滤波装置中广泛采用的检测方法.深入分析了基于瞬时无功功率理论的谐波电流检测法中各环节带来的谐波电流检测误差,包括锁相环的频率偏差和相位偏差、数值采样和计算延时、低通滤波器特性对谐波检测精度的影响,提出了减少谐波检测误差的若干具体措施,并通过MATLAB仿真验证了分析的正确性和措施的有效性.

Harmonics Detection Error Analysis Based on the Instantaneous Reactive Power Theory

Using active power filer(APF) devices is a proper way to reduce harmonic current in power system.The harmonic current detection of APF decides its compensation performance.The detection method based on the instantaneous reactive power theory is popularly applied in APF device.The detection method based on the instantaneous reactive power theory was researched,and its current detection error was analyzed deeply,including influences of the frequency and phase errors of phase-locked loop(PLL),time delay of sampling and calculating on current detection error,and the low-pass filter(LPF) on current detection error.Some proper ways to reduce the error was proposed and improved by MATLAB.