一种基于主动电压扰动的直流微网负载均流控制策略  

A Load Current-Sharing Control Strategy for DC Microgrid Converters Based on Active Voltage Disturbance

作　　者：佟子昂 武建文[1] 马速良[1] 蒋原 罗晓武 Tong Ziang;Wu Jianwen;Ma Suliang;Jiang Yuan;Luo Xiaowu(School of Automation Science and Electrical Engineering Beihang University,Beijing 100191 China;School of Automation and Electrical Engineering University of Science and Technology Beijing,Beijing 100083 China)

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100191 [2]北京科技大学自动化学院,北京100083

出　　处：《电工技术学报》2019年第24期5199-5208,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51677002);民用飞机专项科研技术研究项目(MJ-2017-S-46)资助。

摘　　要：随着新能源发电技术的快速发展,直流微网变换器并联导致的功率分配不均和母线电压控制问题引起了广泛关注。目前,直流微网的大部分均流策略依赖系统或级间通信,均流效果受通信系统的可靠性影响。该文提出一种面向多台直流变换器并联运行,基于主动电压扰动的负载均流控制策略。无需通信,各直流变换器根据扰动前后本地的电气参数获取母线负载信息,据此实现多台直流变换器负载电流的均衡分配,同时将母线电压补偿至额定值;采用主动扰动方式,对电能质量影响小而可控。通过搭建仿真和实验平台,分析了在该文均流测量下负载突变后的均流效果,仿真及实验结果验证了文中均流策略的有效性。With the rapid development of new energy power generation technology,load current-sharing control and bus voltage control of the multiple parallel DC converters have attracted wide attention.Most of the load current-sharing methods depend on the communication between DC converters or system level communication,which have low reliability and bring about bus voltage dropping.In this paper,a load current-sharing control strategy based on active voltage disturbance is proposed.The method does not need communication.The DC converter obtains load information according to the output state change before and after the disturbance.Accordingly,the load current-sharing is achieved and the bus voltage is compensated to the rated value.By establishing the simulation and experimental platforms,the load current-sharing effect before and after the load changing is analyzed.The method uses active disturbance,which has little influence on power quality and is controllable.The results verify the effectiveness of the current sharing strategy.

关 键 词：直流微网 主动电压扰动 负载均流 无需通信 母线电压控制 

分 类 号：TM71[电气工程—电力系统及自动化]