主从结构微电网逆变器离网全过程平滑切换控制策略  

Seamless Transferring Control Strategy for Master-Slave Microgrid Inverter in Whole Off-grid Process

作　　者：张纯江[1] 徐菁远 庆宏阳 柴秀慧[1] 王晓寰[1] ZHANG Chunjiang;XU Jingyuan;QING Hongyang;CHAI Xiuhui;WANG Xiaohuan(Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province(Yanshan University),Qinhuangdao 066004,China)

机构地区：[1]电力电子节能与传动控制河北省重点实验室(燕山大学),河北省秦皇岛市066004

出　　处：《电力系统自动化》2022年第23期125-133,共9页Automation of Electric Power Systems

基　　金：河北省自然科学基金重点项目(E2018203152);国家自然科学基金资助项目(52077191)。

摘　　要：主从结构微电网系统的主逆变器一般采用PQ-V/F控制方法,在非计划孤岛情况下从并网模式切换到孤岛模式会导致孤岛检测期间电压不可控。为解决以上问题,提出了一种基于附加电流控制器和电压保持器的组合式平滑切换控制策略,并网运行时附加电流环与电感电流环共同调节并网电流;孤岛运行时附加电流环退出,电压控制器作为电压外环与电感电流内环共同调节输出电压。孤岛检测期间电压控制器作为保持器,保持孤岛模式下控制器输出量,附加电流控制器与电压保持器配合,共同维持逆变器输出电压,避免了电压越限。仿真和实验结果验证了所提控制策略能够实现非计划孤岛情况下运行模式的平滑切换。The master inverter of the master-slave microgrid system generally adopts the PQ-V/F control method.In the case of the unintentional islanding,the transferring from the grid-connected mode to the island mode will lead to the uncontrollable voltage during the islanding detection.To solve the above problem,a combined seamless transferring control method based on the additional current controller and the voltage retainer is proposed.In the grid-connected operation,the additional current loop and the inductor current loop jointly adjust the grid-connected current.In the island operation,the additional current loop exits,and the voltage controller acts as the voltage outer loop to adjust the output voltage with the inductor current inner loop.During the islanding detection,the voltage controller is used as the retainer to maintain the controller output in the island mode.The inverter output voltage is maintained by the additional current controller and the voltage retainer to avoid the voltage violation.Simulation and experimental results verify that the proposed control strategy can achieve seamless transferring of operation modes under the unintentional island condition.

关 键 词：微电网 主从控制 平滑切换 非计划孤岛 电压控制器 离网运行 

分 类 号：TM464[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]