基于非线性下垂控制的单模式微网并/离网无缝切换技术  

Single Mode Grid-Connected/Islanded Microgrid Seamless Transition Based on Nonlinear Droop Control Technology

作　　者：聂志强[1] 梁晖[1] 罗浩[1] 金渊[2] 

机构地区：[1]国家能源主动配电网技术研发中心(北京交通大学),北京市海淀区100044 [2]国网北京市电力公司电力科学研究院,北京市丰台区100075

出　　处：《电网技术》2016年第5期1371-1378,共8页Power System Technology

基　　金：国家能源应用技术研究及工程示范项目(基于分层储能的主动配电网关键装备研制(NY20150302)~~

摘　　要：双模式并/离网切换过程中会出现并网静态开关滞后于控制程序切换以及控制指令在切换前后会发生突变的现象,切换前后易产生电压、电流畸变,危害供电安全。分析了并/离网切换过程产生电压、电流畸变的原因,提出了改进的并/离网下垂单模式切换方法,采用平移下垂曲线并结合非线性下垂曲线控制策略。在此基础上,切换前对逆变器功率输出进行调整,实现了切换前后控制指令平滑过渡,抑制了电压电流畸变冲击,实现了并/离网平滑无缝切换。仿真和实验结果验证了所提策略的可行性。During dual mode grid-connected/islanding transition,phenomenon of static switch lagging behind control switch and control instructions changing severely makes microgrid produce voltage and current distortion and impact harming power supply safety.By analyzing reasons of voltage and current distortion,this paper adopts improved method of droop single mode grid-connected/islanding transition and droop curve translation combining nonlinear droop control strategy.On this basis,through adjusting inverter power output before switching,control instruction smooth transition is achieved and voltage and current distortion and impact are restrained,realizing grid-connected/islanding seamless and smooth transition.Simulations and experiments verify feasibility of the proposed power control and transition strategy.

关 键 词：双模式 下垂曲线 单模式 非线性 无缝切换 

分 类 号：TM72[电气工程—电力系统及自动化]