可变拓扑的改进型交直流混合微电网  

An Improved Hybrid AC/DC Microgrid with Variable Topology

作　　者：孟润泉[1] 杜毅 韩肖清[1] 王磊[1] 王金浩 王鹏[1] MENG Runquan;DU Yi;HAN Xiaoqing;WANG Lei;WANG Jinhao;WANG Peng(Shanxi Key Lab of Power System Operation and Control(Taiyuan University of Technology),Taiyuan 030024,China;State Grid Shanxi Electric Power Research Institute,Taiyuan 030000,China)

机构地区：[1]电力系统运行与控制山西省重点实验室(太原理工大学),山西省太原市030024 [2]国网山西省电力科学研究院,山西省太原市030000

出　　处：《电力系统自动化》2020年第18期147-154,共8页Automation of Electric Power Systems

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

摘　　要：为提高配电网非理想工况下并网的交直流混合微电网(HMG)的运行性能,提出一种可变拓扑的交直流HMG及其控制策略。首先,在HMG交流母线与配电网之间插入了串联补偿变压器(SCT),并设置对应的双功能变换器在并网运行时控制SCT实现电压补偿,而在孤岛运行时用作HMG交直流母线接口变换器。其次,在分析电路拓扑和工作模式的基础上,设计了双功能变换器与交直流母线接口变换器的解耦协调控制策略。最后,仿真和实验结果表明,在配电网电压波动、暂降和暂升工况下,所提方案能够使HMG交流母线电压保持稳定,提高了HMG的故障穿越能力和供电质量。In order to improve the grid-connected operation performance of the hybrid AC/DC microgrid(HMG)in non-ideal distribution network environment,this paper proposes an improved HMG with variable topology and its control strategies.First,a series compensation transformer(SCT)is inserted between the AC busbar of the HMG and the distribution network,and the corresponding dual functional converter is set to control the SCT to realize voltage compensation in the grid-connected operation mode,while it is used as an AC/DC busbar interface converter of the HMG in the island operation mode.Then,based on the analysis of the circuit topology and operation modes,the decoupled and coordinated control strategies of the dual functional converter and busbar interface converter are designed.Finally,the simulation and experimental results show that the proposed schemes can keep the AC busbar voltage of the HMG stable and improve the fault ride-through ability and power supply quality of the HMG under conditions of voltage fluctuation,sag and swell.

关 键 词：微电网 交直流变换器 串联补偿变换器 故障穿越能力 电能质量 

分 类 号：TM727[电气工程—电力系统及自动化]