第48卷第11期电力系统保护与控制Vol.48No.11 2020年6月1日Power System Protection and Control Jun.1,2020
DOI:10.ki.pspc.190771
孤立直流微电网多DC-DC变换器分布式协调控制策略
吴济东1，汪可友1，黄鑫1，齐琛1，李国杰1，张垠2
(1.电力传输与功率变换控制教育部重点实验室(上海交通大学)，上海200240；
2.国网上海市电力公司科学研究院，上海200437)
摘要：在孤立直流微电网中，为保证电网运行的稳定与设备运行的协调，多DC-DC变换器需要在保证直流母线电压稳定的同时，维持各变换器之间的功率能够按照设置的比例进行分配。研究表明，基于Lyapunov第二定律的新型协调控制策略，可以确保直流母线电压的稳定。研究各变换器的功率，证明了各变换器功率能够按照用户的设定实现按比例分配。分析表明，该控制策略作用下，控制策略的收敛速率按照指数的收敛速率进行收敛，响应速率较为迅速。其性能通过simulink离线仿真和StarSim HIL Pro实时仿真进行了验证，仿真结果与理论分析相吻合。
关键词：孤立直流微电网；电压稳定；协调控制；Lyapunov第二定律
Distributed coordinated control scheme of parallel DC-DC converters in isolated DC microgrids
WU Jidong1,WANG Keyou1,HUANG Xin1,QI Chen1,LI Guojie1,ZHANG Yin2
(1.Key Laboratory of Control of Power Transmission and Transformation(Shanghai Jiao Tong University),
Ministry of Education,Shanghai200240,China;2.Electric Power Rearch Institute of State
Grid Shanghai Municipal Electric Power Company,Shanghai200437,China)
Abstract:In isolated microgrids,to ensure the stability of power grid operation and the coordination of equipment operation,parallel DC converters are required to both ensure the DC bus voltage stability and maintain the power sharing ratio of each converter at the t proportion.Rearch indicates that a novel coordinating control scheme bad on the Lyapunov cond theorem can ensure the stability of the DC bus voltage.By analyzing the power of each converter connecting to the DC bus,the power sharing ratio can be t proportionally according to the ur’s command.Analysis shows that under the control scheme,the convergent speed is exponential,which means that the convergence is relatively fast.The rearch is verified by a Simulink offline simulation and StarSim HIL Pro real-time simulation.The simulation results correspond to the theoretical analysis.
This work is supported by National Natural Science Foundation of China(No.51877133)and Science and Technology Project of State Grid Corporation of China(No.52094017000Z)“Rearch on Theory,Design,and Control Technology of Microgrid Novel Operation Mode bad on Electric Power Spring”.
Key words:isolated DC microgrids;voltage stability;coordinating control scheme;Lyapunov cond theorem
0引言
随着化石能源的逐步枯竭以及公众对环境保护要求的日益提高，以光伏发电、风力发电为代表的新能源发电方式以其可持续性、环保无污染等特点日益受到电力研究者及电力行业工作人员的关注。
基金项目：国家自然科学基金项目资助(51877133)；国家电网公司科技项目资助(52094017000Z)“基于电力弹簧的微电网新型运行模式原理、设计与控制技术研究”
然而，光伏发电、风力发电等新能源发电形式受制于气候等自然条件，具有不稳定性、间歇性、难以预测等特点，使得新能源发电的大规模并网具有较大的挑战[1-7]。
如图1所示，在直流微电网中，通常利用直流母线汇集、分配、传输新能源发电方式发出的功率，使
连接于直流母线上的负载工作于正常状态。并通过储能装置，平衡用电量与扰动的新能源发电量，
