一种微网主逆变器的并/离网平滑切换策略  

A Seamless Transfer Strategy Between Grid-connected and Islanding Operation for Microgrid Inverters

作　　者：王伟[1] 韦徵[1] 陈杰[2] 陈新[2] WANG Wei;WEI Zheng;CHEN Jie;CHEN Xin(l.NARI Group Corporation/State Grid Electric Power Research Institute,Nanjing 211106,China;不详)

机构地区：[1]国电南瑞科技股份有限公司,江苏南京211106 [2]南京航空航天大学,自动化学院,江苏南京211106

出　　处：《电力电子技术》2021年第7期123-125,133,共4页Power Electronics

基　　金：南瑞集团科技项目(524608190042);国家自然科学基金(51777095)。

摘　　要：微网需要具备孤岛和并网两种运行模式,而如何实现两种模式间的平滑切换是技术难点。研究了主从结构微网主逆变器在两种模式下的平滑切换控制策略,在传统控制结构基础上提出了一种基于单位增益控制的逆变器并/离网平滑切换方法。通过引入合理的前馈环节,使得电压环和电流环的增益为1,即在控制模式切换前后均具有相同的单位增益,从而消除了在模式切换时的扰动和暂态影响。给出了该控制策略的原理分析,详细设计了前馈环节的实现方法。最后搭建了一台原理样机,对所提控制策略进行了验证。Microgrid should provide grid-connected and islanding operation modes,however,how to effectively realize smooth switch between these two modes remains a technical barrier.A feedforward based unity gain control strategy to guarantee the smooth transfer for the microgrid with master-slave configuration is proposed.By introducing a feedforward branch,the gain of voltage loop and current loop can be designed to be unity,either in the grid-connected or islanding operation mode.Thus,voltage overshoot or sag along with the modes switching can be effectively improved.Operational principle of the proposed control and its design consideration of the feedforward function is discussed.Finally,an experimental prototype is established,experimental results verify the effectiveness of the control strategy.

关 键 词：逆变器 微网 平滑切换 

分 类 号：TM464[电气工程—电器]