基于电流跟踪的多直流微源并联运行主从控制策略  

Master-Slave Control Strategy for Parallel Operation of Multiple DC Micro-Source Based on Current Tracking

作　　者：涂春鸣[1] 熊诵辉 肖凡[1] 兰征[1] 姜飞[2] 吴连贵[1] 刘贝[1] 

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082 [2]长沙理工大学电气与信息工程学院,湖南省长沙市410004

出　　处：《电网技术》2017年第7期2205-2213,共9页Power System Technology

基　　金：国家自然科学基金项目(51377051)~~

摘　　要：直流下垂控制可以改善直流微源并联的电流分配效果,然而其不能同时满足电流分配精度和调压要求。为此,提出一种基于电流跟踪的并联直流微源主从控制策略,其主变换器提供基准电流,各从变换器则根据自身容量比例跟踪主变换器的基准电流,该方法在满足电流分配精度的同时改善了变换器输出电压的偏移和负载电压的跌落;分析了所提控制策略的稳定性,并验证了其动态特性;研究并定量计算了允许最大电压偏移时的临界线路阻抗。最后,设计2台容量比为1:2的直流变换器进行仿真和实验,仿真和实验结果均证明了所提控制策略和临界线路阻抗分析的正确性和有效性。DC droop control can improve load current sharing between parallel-connected DC micro-sources. However, it cannot meet accuracy requirement of current distribution and voltage regulation. This paper presents a master-slave control strategy based on current tracking for parallel-connected DC micro-sources. The master converter generates reference current and the slave converter tracks the reference current proportionally according to their capacity. This method can meet accuracy requirement of current sharing and improve converter output voltage excursion and load voltage drop. Stability of the proposed control strategy is analyzed, and its dynamic characteristics are verified. Critical line impedance at permitted maximum voltage excursion was calculated quantitatively. At last, simulation and experiment is performed using two DC converters with capacity ratio 1：2. Results verify correctness and effectiveness of the proposed control strategy and analysis of the critical line impedance.

关 键 词：直流下垂控制 基准电流 主从控制策略 电流分配 电压偏移 临界线路阻抗 

分 类 号：TM721[电气工程—电力系统及自动化]