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| Study of Dead-Time Compensation Strategy in Selective Harmonic Elimination PWM Inverter |
| 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 |
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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.
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Received: 11 January 2016
Published: 01 August 2017
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2017, Vol. 32 
