中国电机工程学报2017，Vol.37Issue(19)：5741-5748,8.DOI:10.13334/j.0258-8013.pcsee.161800
光伏并网逆变器非互补混合脉宽调制下电流过零畸变分析与抑制
Analysis and Suppression of Zero Crossing Distortion Currents in Photovoltaic Grid Connected Inverters With Non-complementary Hybrid Pulse Width Modulation
摘要
Abstract
For photovoltaic (PV) grid-connected inverters,non-complementary hybrid pulse width modulation (NC-HPWM) has the advantages of less switches frequency and strong anti-interference ability.However,the switches are operating under the fundamental frequency based on the polarity of the grid voltage,which causes serious zero crossing distortion in the grid current.This paper compared the current commutation process of NC-HPWM and the traditional complementary hybrid PWM in both open loop and closed loop control and pointed out that discontinuous current mode and the status of "out of control" are the main reasons for NC-HPWM current zero crossimg distortion.On the basis of the analysis,equation of the "out of control" angle was derived.Two suppression methods,bridge side inductance optimization and control gate signal shielding,were proposed to reduce/eliminate the zero crossing distortion.Simulation and experimental results show that the proposed methods can effectively suppress the zero crossing distortion and the total harmonic distortion (THD) of the grid current can be reduced by 25％o～35％.关键词
光伏并网逆变器/非互补混合脉宽调制/过零畸变/电流断续/失控Key words
photovoltaic grid-connected inverter/non-complementary hybrid pulse width modulation/zero crossing distortion/discontinues current mode/out of control分类
信息技术与安全科学引用本文复制引用
张芮,李媛..光伏并网逆变器非互补混合脉宽调制下电流过零畸变分析与抑制[J].中国电机工程学报,2017,37(19):5741-5748,8.基金项目
国家自然科学基金项目(51407122).Project Supported by the National Natural Science Foundation of China(51407122). （51407122）
