全桥三电平DC-DC变换器优化控制策略

doi:10.19595/j.cnki.1000-6753.tces.200535

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Abstract In this paper, an optimal control strategy was proposed according to the problems of the full-bridge three level (FBTL) DC-DC converter, such as coordinated control of two duty cycles, small output power of the FBTL DC-DC converter and voltage balance of divided capacitors. First, the characteristics of the FBTL DC-DC converter was analyzed in detail and a self-balance modulation scheme for divided capacitor voltage was investigated. Second, a strategy to resist the voltage disturbance of the divided capacitor was proposed. At the same time, a restraint condition for the duty cycles was investigated. Third, taking the harmonics of the transformer input voltage as the objective, and taking the power of the FBTL DC-DC converter and the voltage regulation capacity of the divided capacitor as the constraints, an optimization model for the duty cycles was established. The optimal duty cycles were calculated offline and stored in the digital control system. The look-up table method was adopted to get the optimal duty cycles. The proposed method does not require an accurate model of the converter, and the control process is simple and efficient. Finally, a FBTL DC-DC converter model in Matlab/Simuink and a FBTL DC-DC converter experimental prototype were built to verify the theoretical analysis.

Key words： HVDC full-bridge three-level DC-DC converter voltages control of the divided capacitors optimal control

Received: 25 May 2020

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TM464

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	Li Wei
	Wang Hui
	Huang Shoudao
	Wu Xuan

Cite this article:

Li Wei,Wang Hui,Huang Shoudao等. Optimal Control for the Full-Bridge Three-Level DC-DC Converter[J]. Transactions of China Electrotechnical Society, 2021, 36(16): 3342-3353.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200535 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I16/3342

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