Abstract：Due to the dead-time setting, the switch tube can't break at ideal moment, which leads to the output waveforms distortion of inverter. In order to improve the waveform, dead-time effect needs to be compensated. Taken advance-off mode as an example, the influence of dead time on selective harmonic elimination pulse width modulation (SHEPWM) was analyzed in this paper. The curves of amplitude and total harmonic distortion (THD) at different dead time were given. A novel dead time compensation strategy was proposed. Set dead time on the S2 and S3 trigger pulse in the positive half cycle, and on S1 and S4 trigger pulse in the negative half period. The current of the switch tube and the corresponding continuous current diode during the dead-time compensation phase was analyzed in detail. Taken power MOSFET as an example, the switch process was analyzed. The empirical formula of the dead time was provided. Finally, simulations and experiments were carried out on the simulation model and hardware platform. The results show that the compensation strategy can effectively alleviate the waveform distortion caused by the dead time.
罗辞勇, 王英豪, 王卫耀, 南航, 魏欣欣. 单相特定谐波消除脉宽调制高频逆变器的死区补偿策略[J]. 电工技术学报, 2017, 32(14): 155-164.
Luo Ciyong, Wang Yinghao, Wang Weiyao, Nan Hang, Wei Xinxin. Study of Dead-Time Compensation Strategy in Selective Harmonic Elimination PWM Inverter. Transactions of China Electrotechnical Society, 2017, 32(14): 155-164.
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2017, Vol. 32 
