基于模糊PI与电流分配补偿的微网下垂控制  

Droop Control of Microgrid Based on Fuzzy PI and Current Distribution Compensation

作　　者：杨桂兴[1,2] 王维庆 印欣[2] YANG Gui-xing;WANG Wei-qing;YIN Xin(Xinjiang University,Urumqi 830049,China;不详)

机构地区：[1]新疆大学,新疆乌鲁木齐830049 [2]国网新疆电力有限公司,新疆乌鲁木齐830049

出　　处：《电力电子技术》2023年第8期90-93,共4页Power Electronics

基　　金：国家自然科学基金(52067020)。

摘　　要：由于线路阻抗不可忽略,传统应用于直流微电网的DC/DC变换器的下垂控制会造成直流母线电压存在偏差,分布式单元输出电流/功率不均衡。因此,为了减小母线电压偏差并提高各单元输出电流/功率均分程度,此处提出了一种基于电压电流双补偿的改进下垂控制策略。利用模糊算法对电压偏差进行补偿,提升电压控制精度;同时通过相邻单元间的输出电流信息交互,精确分配各变换器输出电流/功率。为了验证所提控制策略的可行性,分别搭建了基于双有源桥(DAB)结构的直流微电网模型,同时搭建了2台DAB并联的直流微网实物平台。仿真和实验结果表明了所提控制策略对于提升电压/电流控制精度的有效性和正确性。Because the line impedance is not negligible,the droop control of DC/DC converter used traditionally in DC microgrid will cause the DC bus voltage deviation and the distributed unit output current/power imbalance.Therefore,in order to reduce the voltage deviation of the bus and improve the output current/power distribution degree of each unit,an improved droop control strategy based on double compensation of voltage and current is proposed.Fuzzy algorithm is used to compensate the voltage deviation and improve the voltage control precision;at the same time,the output current/power of each converter can be accurately allocated through the exchange of output current information between adjacent units.In order to verify the feasibility of the proposed control strategy,a DC microgrid model based on the dual active bridge(DAB)structure is built respectively,and two DAB parallel DC microgrid physical platforms are built at the same time.Simulation and experimental results show that the proposed control strategy is effective and correct for improving the voltage/current control accuracy.

关 键 词：变换器 微电网 电流分配补偿 下垂控制 

分 类 号：TM46[电气工程—电器]