低应力高电平开关电容逆变器及其调制策略

doi:10.19595/j.cnki.1000-6753.tces.210241

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Abstract In order to improve the boost capability and output power quality of inverters in the renewable energy power generation system, this paper proposed a switched capacitor inverter with low voltage stress and high-level characteristics. The proposed topology has one input DC source, three capacitors and fifteen switching devices, which can achieve four times voltage gain and seventeen-level output waveform. Compared with other topologies, the performance of the proposed inverter can generate more output levels with fewer switching devices, reducing the voltage stress of switching devices and the harmonic content of inverter output voltage. Moreover, the inversion process can be realized without a back-end H-bridge, and the voltage stress of switches is reduced effectively. In addition, the proposed inverter has small voltage ripple, and the capacitor voltage self-balancing performance simplifies the complexity of the controller. The paper introduces the topology, working principle, and modulation strategy of the proposed inverter in detail, and analyzes the calculation of voltage ripples. The proposed inverter shows excellent performance compared to various switched capacitor topologies. Finally, the feasibility of the proposed inverter and the correctness of the theoretical analysis are verified by the experimental results.

Key words： Multilevel inverter switched capacitor low voltage stress high output level capacitors voltage self-balancing

Received: 01 March 2020

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TM464

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	Articles by authors
	Wang Yaoqiang
	Zhang Hengtai
	Lai Jinmu
	Wang Kewen
	Liang Jun

Cite this article:

Wang Yaoqiang,Zhang Hengtai,Lai Jinmu等. Topology and Modulation Strategy for Switched Capacitor Inverter with Low Voltage Stress and High Level[J]. Transactions of China Electrotechnical Society, 2021, 36(20): 4237-4248.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210241 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I20/4237

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