适用于中高压直流电网的开关电容接入式直流变压器

doi:10.19595/j.cnki.1000-6753.tces.161130

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Abstract A scheme of dc transformer based on switched capacitor applied in high and medium DC power system was presented and analyzed in this paper. When the DC voltage ratio of primary and secondary voltage sides fails to match the voltage ratio of transformer, the voltage matching of high frequency link can be achieved by adding a short circuit conduction process of the primary full bridge, thereby improving the current stress of the switches and the efficiency of the system. The proposed scheme can also be functioned as a DC circuit breaker. It can remove a DC-side short circuit fault and resume operation very quickly once the fault disappears, which improves the reliability of the system. Redundancy operation can also be realized when internal sub-module fault occurs, further improving the reliability of the system. In this paper, the characteristics of voltage and current, conduction behavior, control and fault dealing strategies, and parameters design were analyzed. The correctness and practicability of the proposed scheme were verified by the physical prototype experiment.

Key words： High and medium DC power system DC transformer switched capacitor voltage match redundancy operation DC circuit breaker

Received: 19 July 2016 Published: 05 March 2018

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TM46

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	Li Jianguo
	Zhao Biao
	Song Qiang
	Liu Wenhua

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Li Jianguo,Zhao Biao,Song Qiang等. DC Transformer Based on Switched Capacitor in High and Medium Voltage DC Power System[J]. Transactions of China Electrotechnical Society, 2018, 33(4): 817-825.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161130 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I4/817

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