微电网平滑切换控制方法及策略  

Control Methods and Strategies of Microgrid Smooth Switchover

作　　者：郑竞宏[1] 王燕廷[2] 李兴旺[2] 王忠军[2] 王小宇[1] 朱守真[1] 

机构地区：[1]电力系统国家重点实验室,清华大学电机系,北京市100084 [2]东北电力大学电气工程学院,吉林省吉林市132012

出　　处：《电力系统自动化》2011年第18期17-24,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50823001,51007044)~~

摘　　要：微电网由并网运行模式到孤岛运行模式的平滑切换是保证微电网区域内重要负荷持续可靠供电的重要手段。文中利用MATLAB/Simulink仿真软件建立了逆变器微源类型的微电网模型,实现了微电网并网及孤岛2种运行模式及其相应的控制方法。在推导控制器系统传递函数的基础上,分析了控制参数对系统频谱特性的影响,并通过时域仿真研究了控制参数对微电网运行模式切换暂态过程的影响规律,在此基础上提出了基于控制器状态跟随的微电网平滑切换控制方法。同时,从微电源容量与微电网内负荷匹配程度的角度,提出了3区域平滑切换控制策略,有效地减小了微电网2种运行模式切换过程中的暂态振荡。通过仿真验证了所提出的平滑切换控制方法及策略的有效性。Smooth switchover of microgrid from grid-connected operation mode to islanded operation mode can guarantee the continuous power supply to important loads.A microgrid model for inverter source is established with MATLAB/Simulink software,which realizes both grid-connected and islanded operation modes of microgrid and their control methods.Then the impacts of control parameters on the spectrum characteristics are analyzed based on the transfer function of controller system.And through time-domain simulation,impact of control parameters on transient process of microgrid operation mode switchover are investigated.According to the analysis above,a microgrid smooth switchover control method based on controller status follow is presented.In the meantime,as viewed from the micro-source capacity matching with load,the three-region smooth switchover control strategies are proposed to effectively reduce the transient oscillations in switchover process of microgrid two operation mode.Finally,the simulation results show the effectiveness of the proposed smooth switchover method and strategies.

关 键 词：微电网 平滑切换 控制器状态跟随 控制策略 

分 类 号：TM711[电气工程—电力系统及自动化]