A Parallel Power Quality Conditioner without harmonic detection

A non-harmonic detection Parallel Power Quality Conditioner (PPQC) which can compensate harmonics and reactive power without harmonic and reactive power detection is introduced. By studying the energy exchange process and principle between the AC side and DC side, a DC voltage control method, controlling the magnitude and direction of the current flowing into the DC side, is proposed, to keep the DC voltage stable. The influence of the load active current on the DC voltage is analyzed in detail. A new non-harmonic detection control strategy is proposed with the load active current as a perturbation. The proposed control strategy which avoids complex detection algorithm, and in turn the errors and delay caused by detection algorithm, improves dynamic response speed greatly. Experiment results exhibit excellent harmonic and reactive power compensation performance and dynamic response.