基于交流小信号注入的双向DC-DC变换器均流控制  

Current Sharing Control of Bidirectional DC-DC Converter Based on AC Voltage Small Signal Injection

作　　者：段慧芹[1] 黄志勇[1] 杜书平[1] 鄢天毕 韦永恒 魏红星 程卓 DUAN Huiqin;HUANG Zhiyong;DU Shuping;YAN Tianbi;WEI Yongheng;WEI Hongxing;CHENG Zhuo(State Grid Xinyang Power Supply Company,Xinyang 464000,Henan,China;Guiyang Ruitai Electric Power Technology Co.,Ltd.,Guiyang 550002,Guizhou,China)

机构地区：[1]国网信阳供电公司,河南信阳464000 [2]贵阳锐泰电力科技有限公司,贵州贵阳550002

出　　处：《电气传动》2022年第14期15-19,共5页Electric Drive

基　　金：国网河南省电力公司科技项目(5217701500FZ)。

摘　　要：储能双向DC-DC变换器作为实现直流微电网功率平衡的关键设备,变换器间的功率分配是多变换器并联控制的主要目标之一。为了解决双向DC-DC变换器的均流问题,提出了一种基于交流电压小信号注入的并联均流控制策略。设计了双向DC-DC变换器的充/放电切换策略,并在双向DC-DC变换器的高压侧的电压中注入交流电压小信号,利用交流电压产生的无功功率协调各变换器的电流,进而实现了双向DC-DC变换器在充放电多工况下的负载精确分配。最后,实验验证了所提方法的可行性和有效性。Bidirectional DC-DC converter is the key equipment to realize the power balance of DC microgrid,and the accurate distribution of load current is one of the main objectives of multi converter parallel control. Aiming at the current sharing problem of bidirectional DC-DC converter,a current sharing control based on AC voltage small signal injection was proposed. The charging and discharging switching strategy of bidirectional DC-DC converter was designed,and a small AC voltage signal was injected into the voltage of high voltage side of bidirectional DC-DC converter,and the reactive power generated by AC voltage was used to coordinate the current of each converter,so as to realize the accurate load distribution of bidirectional DC-DC converter under multiple charging and discharging conditions. Finally,the feasibility and effectiveness of the proposed method were verified by experiments.

关 键 词：双向DC-DC变换器 均流控制 频率下垂 Q—V下垂控制 

分 类 号：TM46[电气工程—电器]