一种优化的基于i_p-i_q法的谐波电流检测方法

分析了采用低通滤波器滤波的传统ip-iq法和采用电流平均值滤波的改进的ip-iq法的原理,并进行了仿真实验。仿真结果表明,单独采用传统的ip-iq法进行滤波时电流输出波形中的纹波较大,而单独采用电流平均值法进行滤波虽然可以提高动态响应速度,但其检测结果易受基波电流变动的影响。针对上述问题,提出了将低通滤波器和电流平均值滤波器串联的优化的ip-iq法,并进行了仿真实验。仿真结果表明,优化的ip-iq法既具有较好的检测精度,又具有令人满意的动态响应速度。

An Optimized Harmonic Current Detection Method Based on ip-iq Method

Principles of traditional i_p-i_q method using low-pass filter and improved i_p-i_q method using current average filter were analyzed,and simulation experiment were made.The simulation result showed that independently using the traditional i_p-i_q method to filter exists bigger ripper in output waveform of current,and independently using current average method to filter can improve dynamic response speed,but its detection result is easy to be influenced by change of fundamental current.In order to solve the problems,an optimized i_p-i_q method which combining low-pass filter and current average filter was proposed,and simulation experiment was made.The simulation result showed that the optimized i_p-i_q method not only has better detection precision but also has satisfied dynamic response speed.