【摘要】 当三相电压不对称时ip-iq 检测法会产生误差 ,本文对ip-iq 检测法在三相电压不对称时存在的误差进行了分析。之后提出了一种改进的ip-iq 检测法 ,在该检测法中用基于低通滤波的A相正序电压提取单元代替原ip-iq 检测法中的锁相环 ,以提取A相正序电压。仿真与试验证明在三相电压畸变且不对称时该检测方法仍然能正确地检测出谐波与基波有功、无功电流更多还原

【Abstract】 The i p i q detecting method will cause errors when three phase voltage is imbalance. The errors are analyzed in this paper. A improved i p i q detecting method is put forward. In order to select phase A fundamental positive sequence voltage, a voltage selected unit based on low pass filter is used to replace the phase lock loop of i p i q detecting method. Simulation and experiment show that the improved i p i q detecting method can accurately detect harmonics, active current and reactive current of fundamental when three phase voltage is imbalance and is distorted.更多还原