直流电压不均衡的级联H桥多电平变频器载波移相PWM调制策略的设计

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Abstract In practice,many factors result in non-equal cell DC voltages of the cascaded H-bridge multilevel (CHBML) inverter,such as the differences amongthe DC sources of the H-bridge cells and the faults of the DC sources.The classical phase-shifted carrier (PSC) pulse width modulation (PWM) is unable to eliminate the low-frequency sideband-harmonics when the DC voltages of the cells are not equal.The quality of the output voltage degrades.In this paper,the relationship among the cell carrier-phases,the DC voltages,and the harmonics of the output voltage are analyzed.And then,a novel PSCPWM method,in which the carrier phases are regulated according to the different DC voltages,is proposed.This method improves the quality of the output power by eliminating the low-frequency sideband harmonics,and also enhances the fault-tolerance capability of the inverters.The simulation and experimental results obtained from the prototype of the CHBML inverter verify the suggested regulation strategy.

Key words： Cascaded H-bridge multilevel inverter non-equal DC voltages phase-shifted carrier PWM fault-tolerance capability

Received: 06 January 2015 Published: 21 January 2016

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TM464

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	Articles by authors
	Cai Xinjian
	Wu Zhenxing
	Sun Le
	Wang Shuxiu

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Cai Xinjian,Wu Zhenxing,Sun Le等. Design for Phase-shifted Carrier Pulse Width Modulation of Cascaded H-bridge Multi-level Inverters with Non-equal DC Voltages[J]. Transactions of China Electrotechnical Society, 2016, 31(1): 119-127.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I1/119

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