级联型多电平逆变器线电压谐波优化的 SVPWM策略

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Abstract As for cascaded multilevel inverter, carrier phase shift(CPS) can naturally achieve power balance between each H-bridge, and the number of switching transitions of all the switching transistors trends to be equivalent. However, for three phase systems, CPS is suboptimal compared with phase disposition(PD) in terms of the spectrum of line-line voltage. Firstly, this paper discusses a simplified SVPWM algorithm for cascaded multilevel inverter. The SVPWM algorithm for multilevel inverter can be simplified to the summation of traditional SVPWM algorithm for two-level inverter. By way of reconstructing the carrier waveforms, the optimal harmonic spectrum of the output line-to-line voltage can be achieved. At the same time, power balance and the same switching number can be naturally achieved. The algorithm based on state machine is discussed in this paper, and a 4.5kW prototype is built in the lab. The experimental results verify the proposed SVPWM.

Key words： Cascaded multilevel inverter space vector pulse-width modulation (SVPWM) carrier phase shift(CPS) phase disposition(PD) harmonics on line-to-line voltage

Received: 15 August 2012 Published: 05 November 2014

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TM464

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	Li Jihua
	Ruan Xinbo
	Wang Xuehua

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Li Jihua,Ruan Xinbo,Wang Xuehua. A SVPWM Strategy with Optimal Line-to-Line Voltage Harmonic Spectrum for Cascaded Multilevel Inverters[J]. Transactions of China Electrotechnical Society, 2014, 29(6): 120-128.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I6/120

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