交直流混合微电网中储能变流器无缝切换策略  

Control Strategies of Seamless Switching for Energy Storage Converter in Hybird AC/DC Microgrid

作　　者：毕大强[1,2] 周稳[3] 戴瑜兴[3] 李显国[3] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市100084 [2]电力系统及发电设备控制和仿真国家重点实验室清华大学,北京市100084 [3]电气数字化设计技术浙江省工程实验室温州大学,浙江省温州市325035

出　　处：《电力系统自动化》2016年第10期84-89,共6页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA051201)~~

摘　　要：设计了一种交直流混合微电网结构,分析了储能变流器在该微电网平台结构中的作用,重点研究了并网切换孤岛、孤岛切换并网的过程。针对不同工况互相切换过程中存在的问题,提出了储能变流器无缝切换策略,包含并网切换孤岛过程补偿算法与孤岛切换并网过程预同步方法。实现了两种工作模式间的无缝切换,变流器输出电压电流平滑过渡。仿真与实验结果验证了所提方法的有效性与可靠性。A hybrid AC/DC microgrid structure is designed,and the role of the energy storage converter in this microgrid is analyzed.The switchings between grid-connected and island modes are the focus of attention.For problems in the transition between different working conditions,the seamless switching control strategy is proposed for the energy storage converter,including the compensation algorithm for the transient process during grid-connected mode transition to the island mode,and the pre-synchronization method for the transient process during the island mode transition to the grid-connected mode.Use of the control method proposed makes it possible to achieve seamless switching between the two working conditions above,and the converter output voltage and current are smooth and impact-free during the switching of operating modes.The validity and reliability of the method proposed are verified by simulation and experimental results.

关 键 词：微电网(微网) 储能 变流器 无缝切换 并网/孤岛运行 

分 类 号：TM727[电气工程—电力系统及自动化] TM46