单相特定谐波消除脉宽调制高频逆变器的死区补偿策略

发布时间：2018-03-27 13:35

本文选题：逆变器　切入点：特定谐波消除　出处：《电工技术学报》2017年14期

【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。
[Abstract]:Because of the setting of dead time, the switch can not be switched off at ideal time, which leads to the distortion of the output waveform of the inverter. In order to improve the waveform, the dead-time compensation should be carried out. In this paper, the influence of the dead time on the pulse width modulation (PWM) wave of the high frequency inverter is analyzed when the control of the specific harmonic pulse width modulation is eliminated. The variation curves of the fundamental amplitude and the total harmonic distortion rate with the dead time are given. It is proposed that only the trigger pulse of the switch tube S2 and S3 should be set dead time in the positive half period. In the negative half cycle, only the trigger pulses of S1 and S4 are given dead-zone compensation strategy, and the working state of the current of the switch tube and the corresponding recurrent diode in the dead-zone compensation stage is analyzed in detail. Taking the power MOSFET as an example, the on-off process of the switch tube is analyzed. Finally, the simulation model and hardware platform are built to simulate and experiment the proposed dead-time compensation strategy. The results show that the dead-time compensation strategy can effectively alleviate the waveform distortion caused by the dead zone.
【作者单位】：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);
【分类号】：TM464

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