Study on the Detection for Harmonics and Reactive Currents of Single-Phase and Three-Phase Circuits

A method for direct-detecting the harmonic and reac ti ve current is presented in this paper. The fundamental active and reactive curre nt can be calculated by analyzing the distorted current of single-phase and thr ee-phase circuits in the way of mathematics, so the harmonic current can also b e obtained. Meanwhile this paper also proposes the PD negative feedback, which c an compensate the inherent delay of LPF and quicken the dynamic response speed. Finally, the effectiveness of this detecting method is verified by MATLAB simula tion.