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适用于双极性低压直流微电网的自平衡隔离型DC-DC变换器
裴忠晨1, 宋晓民2, 刘闯1, 林琳3, 朱帝1, 姜宇1, 王菁月1, 李辉1
1.东北电力大学 电气工程学院,吉林 吉林 132012;2.国网山东省电力公司淄博供电公司,山东 淄博 255000;3.浙江华云清洁能源有限公司,浙江 杭州 310000
摘要:
双极性结构低压直流配电系统具有负荷灵活接入、运行可靠性高等优势。为了最大限度地减少功率变换级数并提升双极母线电压平衡能力,提出了一种适用于双极性低压直流微电网的自平衡隔离型DC-DC变换器。首先,介绍了自平衡隔离型DC-DC变换器的拓扑结构与调制策略,并分析了不平衡负载情况下正负极性直流电压自平衡机理及其换流过程;然后,结合零电压开关工作原理与输出电流纹波要求,对平衡电感参数进行优化设计,并推导了不平衡负载直流偏置引起的中性点电位偏移量;最后,搭建了一套实验样机验证了所提变换器在两直流极不平衡负载下甚至其中一直流极空载下可平衡双极母线电压。
关键词:  双极性低压直流微电网  电压自平衡  DC-DC变换器  平衡电感  极电压平衡  零电压开关
DOI:10.16081/j.epae.202202009
分类号:TM46
基金项目:国家自然科学基金资助项目(51877035)
Self-balancing isolated DC-DC converter for bipolar low voltage DC microgrid
PEI Zhongchen1, SONG Xiaomin2, LIU Chuang1, LIN Lin3, ZHU Di1, JIANG Yu1, WANG Jingyue1, LI Hui1
1.School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China;2.Zibo Power Supply Company of State Grid Shandong Electric Power Company, Zibo 255000, China;3.Zhejiang Huayun Clean Energy Co.,Ltd.,Hangzhou 310000, China
Abstract:
The bipolar low voltage DC distribution system has the advantages of flexible load access and high operation reliability. In order to minimize the number of power conversion stages and improve the voltage balance ability of bipolar buses, a self-balancing isolated DC-DC converter suitable for bipolar low voltage DC microgrid is proposed. Firstly, the topology and modulation strategy of self-balancing isolated DC-DC converter are introduced, and the self-balancing mechanism and commutation process of positive and negative pole DC voltages under unbalanced load conditions are analyzed. Then, based on the working principle of zero voltage switching and the requirement of output current ripple, the design of balance inductance parameters are optimized, and the neutral point potential offset caused by unbalanced load DC bias is derived. Finally, an experimental prototype is built to verify that the proposed converter can balance the voltages of the bipolar buses under the conditions of the unbalanced load of two DC poles or even the no-load of one DC pole.
Key words:  bipolar low voltage DC microgrid  voltage self-balancing  DC-DC converters  balance inductance  pole voltage balance  zero voltage switching

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