交直流微电网AC/DC双向功率变换器控制策略  

Bidirectional AC/DC interlinking converter control strategy for an AC/DC microgrid

作　　者：焦皎 孟润泉[1] 任春光[1] 杜毅 JIAO Jiao;MENG Runquan;REN Chunguang;DU Yi(Shanxi Key Lab of Power System Operation and Control,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学电力系统运行与控制山西重点实验室,山西太原030024

出　　处：《电力系统保护与控制》2020年第16期84-92,共9页Power System Protection and Control

基　　金：山西省自然科学基金项目资助(201701D121134);国家自然科学基金项目资助(U1610121);山西省科技重大专项资助(20181102028)。

摘　　要：为了实现交直流混合微电网的可靠并网,基于微电网中AC/DC双向功率变换器下垂控制策略和预同步工作原理,提出一种适用于混合微电网中连接交直流子网的AC/DC双向功率变换器的控制策略。孤岛/并网模式时采用双向下垂控制实现双向功率流动。在由孤岛模式转为并网模式时,利用消除dq轴电压偏差实现幅值与相位同步,无需通过锁相环获取相位信息,实现平滑并网。同时,针对微电网中由于不平衡负载导致的三相不平衡工况,采用正负序分别控制的方法实现了非理想工况下微电网的同步互联。仿真结果验证了该方案的可行性。In order to realize the reliable grid connection of an AC/DC hybrid microgrid,a control strategy for a bidirectional AC/DC interlinking converter connected to an AC-DC subnet in a hybrid microgrid is proposed based on a droop control strategy in the microgrid and a pre-synchronization working principle.In the island/grid-connected mode,the bidirectional droop control is used to achieve bidirectional power flow.When the island mode is changed to the grid-connected mode,the amplitude and phase synchronization can be realized by eliminating the voltage deviation of the dq axis without obtaining phase information through phase-locked loop to realize smooth grid-connection.At the same time,for the three-phase unbalanced conditions caused by an unbalanced load in the microgrid,the method of positive and negative sequence control is adopted to realize the synchronous interconnection of the microgrid under non-ideal conditions.Simulation results verify the feasibility of the proposed scheme.

关 键 词：交直流混合微电网 AC/DC双向功率变换器 下垂控制 同步互联 不平衡工况 

分 类 号：TM46[电气工程—电器]