一种新型飞跨电容型Zeta多电平逆变器

doi:10.19595/j.cnki.1000-6753.tces.201222

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Abstract

This paper proposes a novel flying-capacitor zeta multi-level inverter, which is derived from the evolution of the Zeta converter. The proposed inverter has the advantages of Buck-Boost, capacitor self-sharing, less clamping devices, and topological ductility, which overcomes the limitations of traditional multi-level inverters in application. Firstly, this paper introduces the operating principle of the inverter, and adopts a unipolar carrier phase-shift modulation strategy to increase the equivalent switching frequency without increasing the carrier frequency and finally reduces the total harmonic distortion of the output voltage. In addition, this paper analyzes the voltage stress of the switching devices, the realization of the capacitor self-sharing, the buck-boost capability and the topology extension performance. The proposed inverter adopts a PR controller for closed-loop control, and its feasibility is verified by simulation. In addition, on the basis of theoretical analysis and simulation verification, an experimental prototype of the proposed inverter is built. The experimental results prove the correctness of the theoretical analysis and simulation results, and verify that the inverter has good dynamic and static performance.

Key words： Multi-level inverter Zeta converter buck-boost self-equalization close loop control

Received: 18 September 2020

PACS:

TM464

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	Wang Liqiao
	Han Xujing
	Li Zhanyi
	Yang Bin

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Wang Liqiao,Han Xujing,Li Zhanyi等. A Novel Flying-Capacitor Zeta Multi-Level Inverter[J]. Transactions of China Electrotechnical Society, 2022, 37(1): 254-265.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201222 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I1/254

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