1.School of Information and Electrical Engineering China University of Mining and TechnologyXuzhou 221008 China 2.Sichuan Electric Power Design & Consulting Co.Ltd Chengdu 610041 China
Abstract：To avoid the short circuit of the bridge,the dead-time is often added,which causes the drop of the output capability and the distortion of the output waveforms,and needs to be compensated.The dead-time compensation of the four-leg inverter is hard to be implemented due to its multiple switch states and complex voltage vectors distribution.The forming mechanism of the dead-time effect is firstly analyzed.Then the relevance between the currents polarities and the corresponding compensation methods are generalized.Afterwards a dead-time compensation strategy based on pulse-tuning for four-leg inverters is obtained.This compensation strategy has consistency in specific currents polarities.So it is easy to be implemented.The compensation method is determined as long as the currents polarities are distinguished.The dead-time effect is compensated by correcting the duty factors of the base vectors.Simulation and experiment results prove that the proposed compensation strategy is effective in both balanced and unbalanced situation,can raise the output capability,and reduce the waveform distortion.
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2016, Vol. 31 
