基于平均值理论的谐波电流检测的研究与仿真

针对谐波检测方法中低通滤波器的延时问题,分析了瞬时无功功率理论的原理,采用了电流平均值法,并针对传统电流平均值法的缺陷,提出了改进电流平均值法.该方法在滤除瞬时交流分量时采用不同的积分周期,提高了响应速度和检测精度,能准确地检测出谐波电流.仿真结果及分析表明,采用改进平均值算法的有源滤波器能实时检测和补偿负载谐波电流,达到较好的滤波效果,适合于对电能质量要求较高的用户.

Study and Simulation on Harmonic Current Detection Based on Average Theory

In order to compensate for the delay of low pass filter on harmonic detection,the instantaneous reactive theory is analyzed by using current average method.Since traditional current average method has its defect,an improvement current average method is put forward.The method adopts different integral periods when filtering instantaneous AC component,which enhances response speed and detective precision and can detect the harmonic current accurately.Simulation results and analysis show that the active power filter adopting the improved average algorithm can detect and compensate for load harmonic current in real time,and reach perfect filtering effect,which is especially suitable for consumers demand of higher power quality.