基于有限时间一致性的直流微电网分布式协同控制  

Finite-time Consensus Based Distributed Cooperative Control for DC Microgrids

作　　者：顾伟[1] 薛帅 王勇[3] 柳伟[1] 陈明[1] 曹戈[1] 

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]国网江苏省电力公司检修分公司,江苏省南京市211102 [3]国网南京供电公司,江苏省南京市210019

出　　处：《电力系统自动化》2016年第24期49-55,84,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51477029);国家重点研发计划资助项目(2016YFB0900404)~~

摘　　要：直流微电网的控制目标主要是实现维持电压稳定和负荷比例分配,传统的下垂控制无法同时兼顾两个控制目标,而集中控制存在依赖中央控制器等弊端。文中提出一种基于有限时间一致性的直流微电网分布式控制策略,在下垂控制的基础上,提出包括电流矫正控制和电压调节控制的分布式二次控制。该策略基于多代理系统及其分布式交互协议实现,各分布式电源代理仅与邻居交互输出电流信息,通过有限时间一致性协议,完成各分布式电源的输出电流按比例分配,并利用平均输出电流进行电压协同调节。所述控制策略以分布式的方式实现,能够满足分布式电源即插即用的要求,采用有限时间一致性算法具有较好的收敛性能。为验证该策略的控制效果,在PSCAD/EMTDC中建立了详细的直流微电网模型进行仿真。结果表明所述策略可以有效地完成直流微电网电压稳定和负荷比例分配的控制目标。Two control objectives in DC microgrids are to maintain the stability of voltage and proportional power sharing.While there is an internal trade-off between voltage regulation and power sharing in the conventional droop control,and centralized control is excessively dependent on the central controller.A finite-time consensus based distributed cooperative control is proposed for DC microgrids.On the basis of the droop control,a distributed secondary control is introduced,which includes a current correct control and a voltage regulate control.The strategy is based on the multi-agent system and its distributed interaction protocol.Each DG agent only interchanges output current information with its neighbors.Proportional power sharing is achieved through a finite-time consensus protocol.The voltage is regulated by using the average current.The proposed control scheme is implemented in the fully distributed manner,can meet the requirements of plug and play,and the finite-time consensus algorithm has a better convergence performance.To verify the effectiveness of the scheme,a detailed model of DC microgrid is built in PSCAD/EMTDC.Simulation results indicate that the proposed scheme can effectively achieve the control objectives of voltage regulation and proportional power sharing in DC microgrids.

关 键 词：直流微电网 多代理系统 有限时间一致性 下垂控制 分布式控制 

分 类 号：TM727[电气工程—电力系统及自动化]