基于动态负荷分配的直流微电网电压控制策略  

Voltage control strategy of DC microgrid based on dynamic load allocation

作　　者：肖宏飞[1] 黄锦锋 陈鑫 林艳艳 吴晨曦[2] XIAO Hongfei;HUANG Jinfeng;CHEN Xin;LIN Yanyan;WU Chenxi(School of Information Engineering,Hangzhou Dianzi University,Hangzhou 311305,China;School of Automation,Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学信息工程学院,浙江杭州311305 [2]杭州电子科技大学自动化学院,浙江杭州310018

出　　处：《电力自动化设备》2021年第8期55-61,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(U1766201);浙江省教育厅科研项目(Y201738136)。

摘　　要：U-I下垂控制具有良好的自适应性及扩展性,可用于直流微电网的电压控制及负荷分配。传统下垂控制存在难以兼顾稳态电压控制精度与负荷分配精度、下垂系数整定受限等问题。为此,提出了一种适用于下垂控制的二次电压控制策略,通过电压灵敏度整定下垂控制的电压参考值,实现直流母线电压的快速调节,提高系统的暂态响应速度;根据运行需求整定负荷分配系数,并更新下垂控制的电流参考值,在功率单元间实现所需比例的负荷分配。仿真结果验证了所提控制策略在负荷突变、下垂系数改变、分布式发电发生故障、通信中断等情形下的有效性及适应性。U-I droop control has good adaptability and expansibility,and can be used in voltage control and load distribution of DC microgrid.Traditional droop control is difficult to balance the accuracy of steady-state voltage control with the accuracy of load distribution and its droop coefficient setting is limited.Therefore,a secondary voltage control strategy suitable for droop control is proposed.By setting the voltage reference value of droop control through voltage sensitivity,the DC bus voltage can be regulated quickly and the transient response speed of the system is improved.The load distribution coefficient is set accor-ding to the operation requirements,and the current reference value of droop control is updated to realize the required proportional load distribution among power units.Simulative results verify the effectiveness and adaptability of the proposed control strategy in the case of load mutation,droop coefficient change,distributed generation failure,communication interruption,and so on.

关 键 词：直流微电网 下垂控制 电压调节系数 动态负荷分配 二次电压控制 电压灵敏度 

分 类 号：TM761[电气工程—电力系统及自动化]