基于动态一致性算法的微电网无功功率分布式二级控制策略  

Distributed secondary reactive power control strategy of microgrid based on dynamic consensus algorithm

作　　者：张小莲[1] 石春晖 郝思鹏[1] 殷明慧[2] 张俊芳[2] 陈冲 Zhang Xiaolian;Shi Chunhui;Hao Sipeng;Yin Minghui;Zhang Junfang;Chen Chong(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211167,China;School of Automation,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京工程学院电力工程学院,江苏南京211167 [2]南京理工大学自动化学院,江苏南京210094

出　　处：《可再生能源》2022年第3期368-376,共9页Renewable Energy Resources

基　　金：国家自然科学基金项目(51977111,61673213)。

摘　　要：微电网在孤岛模式运行时,由于线路存在阻抗效应,传统下垂控制无法精准分配输出的无功功率,而且通讯网络复杂,容易造成系统崩溃。文章提出了一种基于动态一致性算法的无功功率分布式二级控制策略,通过设计二级控制规律,将下垂控制和分布式二级控制相结合,在本地下垂控制器中,引入比例-积分控制器,对下垂特性曲线的参考电压进行自适应调节,实现了无功功率与线路阻抗和下垂系数的解耦;通过动态一致性算法实现分布式控制,构建稀疏的通信网络,由本地控制器进行自身决策。仿真分析及结果验证,当负荷突变和通信故障时,与离散平均一致性的分布式控制策略相比,文章所提策略有较好的动态性能。Due to line impedance effect in islanded microgrid,when the traditional droop control is used as the distributed generation(DG)control technology,there is a problem that the distribution accuracy of reactive power output of DG is poor.Moreover,centralized control structure is often used in traditional microgrid control,which requires complex communication net work and is easy to cause communication collapse.The distributed two-level control strategy of reactive power based on dy namic consensus algorithm combines droop control with distributed two-level control,and introduces proportional integral controller in local droop controller to adjust the reference voltage of droop characteristic curve adaptively,realizing the decoupling of reactive power,line impedance and droop coefficient;this control strategy also realizes distributed control through dynamic consistency algorithm,and constructs a sparsity communication network,therefore the local controller can make its own decision.Simulation analysis and results verify that in the face of load mutation and communication failure,the proposed strategy has better dynamic performance than the distributed control strategy based on discrete consistency.

关 键 词：微电网 动态一致性 线路阻抗效应 分布式控制 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程] TK51