电力系统谐波和基波无功检测改进方法

准确、快速地检测电网电流中的谐波成分，是谐波抑制和无功补偿的关键．在小波分析的基础上，结合瞬时无功功率理论，提出了一种谐波和基波无功检测的改进方法．该方法能检测各次谐波和基波无功分量，且运算过程可用软件来实现，不必依赖昂贵的元件和复杂的电路．Matlab仿真结果表明：该方法能实时检测谐波电流和基波无功电流，且检测精度高，动态相应快．

Improved detection method of harmonic and fundamental reactive power in power system

Detecting fast and precisely the harmonic component of network current is very important to depress harmonics and compensate reactive power.By using the instantaneous reactive power theory,a kind of improved method in detecting harmonic and fundamental reactive power based on wavelet analysis is(proposed.)The proposed method can detect all orders of harmonics and fundamental reactive components.The whole operation process can be realized by software.The scheme needn't expensive elements and complex circuits.The results of Matlab simulation show that the method can detect timely harmonic(current and) fundamental reactive power current.High detection precision and quick dynamic response are obtained.power system;harmonic;fundamental reactive power;wavelet analysis;instantaneous(reactive) power;detection