单相特定谐波消除脉宽调制高频逆变器的死区补偿策略  

Study of Dead-Time Compensation Strategy in Selective Harmonic Elimination PWM Inverter

作　　者：罗辞勇[1] 王英豪[1] 王卫耀 南航[1] 魏欣欣[1] Luo Ciyong;Wang Yinghao;Wang Weiyao;Nan Hang;Wei Xinxin(State Key Laboratory of Power Transmission Equipment & System Secutrity and New Technology Chongqing University,Chongqing 400044 China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电工技术学报》2017年第14期155-164,共10页Transactions of China Electrotechnical Society

摘　　要：由于死区时间的设置,开关管不能以理想时刻开断,导致逆变器输出波形发生畸变。为改善波形,需要进行死区补偿。以提前关断方式为例,深入分析高频逆变器在消除特定谐波脉冲宽度调制控制时,死区对特定谐波消除脉宽调制(SHEPWM)波的影响,给出了基波幅值和总谐波畸变率随死区时间的变化曲线。提出在正半周期内只对开关管S2和S3的触发脉冲设置死区,在负半周内只对S1和S4的触发脉冲设置死区的死区补偿策略,详细分析死区补偿阶段开关管及相应续流二极管的电流的工作状态。以功率MOSFET为例分析开关管的开通关断过程,并给出了死区时间设置的经验公式。最后,搭建仿真模型和硬件平台对所提死区补偿策略进行仿真和实验,结果表明该死区补偿策略有效缓解了由于死区所造成的波形畸变。Due to the dead-time setting,the switch tube can't break at ideal moment,which leadsto the output waveforms distortion of inverter.In order to improve the waveform,dead-time effectneeds to be compensated.Taken advance-off mode as an example,the influence of dead time onselective harmonic elimination pulse width modulation(SHEPWM)was analyzed in this paper.Thecurves of amplitude and total harmonic distortion(THD)at different dead time were given.A noveldead time compensation strategy was proposed.Set dead time on the S2and S3trigger pulse in thepositive half cycle,and on S1and S4trigger pulse in the negative half period.The current of the switchtube and the corresponding continuous current diode during the dead-time compensation phase wasanalyzed in detail.Taken power MOSFET as an example,the switch process was analyzed.Theempirical formula of the dead time was provided.Finally,simulations and experiments were carried outon the simulation model and hardware platform.The results show that the compensation strategy caneffectively alleviate the waveform distortion caused by the dead time.

关 键 词：逆变器 特定谐波消除 脉冲宽度调制 死区效应 补偿策略 

分 类 号：TM464[电气工程—电器]