摘要
双极直流微电网因其具有较高的灵活性、可靠性和兼容性而受到广泛关注,但也存在极间电压不平衡的挑战。针对双极直流微电网中源、荷功率的不平衡分布导致极间电压偏差的问题,提出一种具备双极输出电压自均衡能力的隔离型DC/DC变换器。该变换器由移相全桥逆变单元和可调节的双极性电压增益单元组成,可有效支撑双极直流微电网极间电压的自动均衡,并且还具备控制简单、结构可扩展的优点。首先,详细阐述了所提变换器的推演过程,并给出了不同模态下的工作原理。然后,对该变换器的电压增益及器件应力、自平衡原理和损耗计算等方面进行了深入分析。最后,搭建了一台1 kW的实验样机对理论分析进行了验证。实验结果表明,所提变换器具备良好的双极输出电压自均衡能力。
Bipolar DC microgrids have attracted widespread attention due to their high flexibility,reliability,and compatibility.However,they also face challenges,such as voltage imbalance between poles.To address the problem of voltage deviation caused by unbalanced power distribution between source and load in bipolar DC microgrids,an isolated DC/DC converter with bipolar output voltage self-balancing capability is proposed.The proposed converter consists of a phase-shifting full-bridge inverter unit and an adjustable bipolar voltage gain unit,which can effectively support the automatic voltage balancing between the poles in a bipolar DC microgrid.It also features simple control and expandable structure.First,the derivation process of the proposed converter is elaborated in detail,and the working principles under different modes are presented.Then,an in-depth analysis is conducted on voltage gain,device stress,self-balancing principle,and loss calculation.Finally,a 1 kW experimental prototype is built to verify the theoretical analysis.Experimental results demonstrate that the proposed converter exhibits excellent bipolar output voltage self-balancing capability.
作者
邾玢鑫
陈思
杨浴金
王凯宏
杨楠
ZHU Binxin;CHEN Si;YANG Yujin;WANG Kaihong;YANG Nan(Hubei Provincial Research Center on Microgrid Engineering Technology,College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China)
出处
《电力系统保护与控制》
北大核心
2025年第19期139-150,共12页
Power System Protection and Control
基金
广西重点研发计划项目资助(桂科AB23026037)
湖北省教育厅科学研究计划重点项目资助(D20231201)。
关键词
双极直流微电网
自平衡
变换器
拓扑推演
bipolar DC microgrid
self-balancing
converter
topology derivation
