基于数字信号处理的谐波和无功电流的检测

Harmonic and Reactive Current Detection Based on Digital Signal Processing

针对谐波和无功电流检测中存在的问题,提出了一种离散检测方法。通过构造同步基准正余弦信号,获得了电压、电流的基波正序分量,消除了三相电压不对称与同步信号发生电路对检测结果的影响。并在此基础上扩展研究了检测任意次谐波正序、负序和零序分量的情况。仿真测试结果证明了该方法的有效性。

A discrete detection method is proposed for the detection of harmonic and reactive currents. By constructing synchronous sine and cosine reference signals, the fundamental positive sequence components of voltage and current are acquired ,and the influence on the detection results from the asymmetry of three-phase voltages and synchronous signal generator is eliminated. Furthermore, its extension to the detection of positive, negative and zero sequence components of any order harmonic is discussed. Simulation results prove the effectiveness of the method.