微电网用有源电力滤波器谐波电流检测新方法

An Improved Harmonic Current Detection Method of APF for Micro-grid

对基于瞬时无功功率理论的ip-iq检测方法进行改进,提出了一种微电网用有源电力滤波器谐波电流检测新方法。通过合理地选择每一级混合形态滤波器结构元素的形状和长度,将多个混合形态滤波器进行串行级联,由此构建链式混合形态滤波器,取代ip-iq检测算法中的低通滤波器以减小检测延时,并用同步参考计算模块替换锁相环以减小检测误差。仿真和实验结果表明,与传统谐波电流检测方法相比,该方法可更快速而准确地检测出谐波信号。

It presented a new harmonic current detection method of active power filter （APF） for micro-grid based on the traditional i-iq detection method. Shape and length of structural elements of each mixed morphological filter were chosen reasonably and chain mixed morphological filter（CMMF） was constituted with mixed morphological filters concatenated serially instead of low-pass filter （LPF） in the traditional i-iq detection method in order to reduce the detection delay. Furthermore, synchronous reference calculation module was used to replace phase lock loop （PLL） for reducing detection error. Simulation and experimental results show that this method can detect harmonic signals faster and more accurately than the traditional one.