基于虚拟电阻的微电网孤岛运行控制策略  

Control Strategy for Island Microgrid Based on Virtual Resistance

作　　者：刘东奇 韩民晓 谢文强[1,2] 李蕊 LIU Dong-qi;HAN Min-xiao;XIE Wen-qiang;LI Rui(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Source,North China Electric Power University,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室,华北电力大学,北京102206 [2]华北电力大学,电气与电子工程学院,北京102206 [3]中国电力科学研究院,北京100192

出　　处：《电力电子技术》2018年第9期10-13,共4页Power Electronics

基　　金：国网公司科技项目(PDBl7201600116)

摘　　要：将下垂控制应用于微电网中电压源型逆变器的并联运行,具有无需通信、即插即用的优点,增加了系统的冗余性和灵活性,但也存在系统频率偏移、输出电压跌落等问题。为此提出一种基于虚拟电阻的下垂控制策略,删除了传统三环下垂控制中的功率下垂环,使用虚拟电阻环代替原来的功率外环,通过调节虚拟电阻的阻值来使各逆变器合理分配功率。此控制策略要求各逆变器输出电压相位一致,所以使用同步脉冲来进行同步,同时也使系统频率保持在50 Hz不随负载波动。仿真和实验证明了所提控制策略的有效性。Droop control that applied to the parallel operation of voltage source inverters in microgrid has the advan- tages of no need of communication, plug and play, which increases the redundancy and flexibility of the system, but there are also some problems such as system frequency offset and output voltage drop.A droop control strategy based on virtual resistance is proposed.The virtual resistance loop is used instead of the original power loop.The power sharing between different inverters is achieved by adjusting the virtual resistance.The synchronous pulse is used to synchronize the voltage phase and keep the system frequency at 50 Hz.Simulation and experiments demonstrate the effectiveness of the proposed control strategy.

关 键 词：微电网 虚拟电阻 同步脉冲 

分 类 号：V242.3[航空宇航科学与技术—飞行器设计]