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Three-Dimensional Pulse Width Modulation Technique in Three-Level Power Inverters for Three-Phase Four-Wired System. Man-Chung Wong,Zheng-Yi Zhao,Ying-Duo Han etc. IEEE Transactions on Power Delivery . 2001
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Three-dimensional space vector modulation for four-leg voltage source converters. Zhang R,Prasad V H,Boroyevich D,et al. IEEE Trans.on Power Electronics . 2003