基于相同线电压谐波频带的中性点漂移技术仿真研究

Research on Neutral Point Drifting Technology Based on the Same Harmonic Distribution of Line Voltage

提出了一种基于相同线电压谐波频带的中性点漂移技术。该方法通过对载波相移角度和频率调制比等参数的优化,实现了3个线电压的高次谐波频带保持一致。与常规的故障功率单元处理方法相比,该方法能增加输出线电压的幅值,同时能减少其总谐波含量(Total Harmonic Distortion,THD)。通过仿真验证了该方法的有效性。

Neutral point drifting technology based on the same harmonic distribution of line voltage is proposed.With the optimization of carrier phase-shifted angle and frequency modulation ratio,the harmonic distribution of three line voltages can be consistent.Comparing with the normal failure power unit treatment,the amplitude of output voltage can be increased and THD（Total Harmonic Distortion） can be decreased.Simulation results verify the validity of the proposed method.