对等结构的微网逆变器控制策略研究  

Research on the Control Scheme for Inverter of Microgrid Based on Peer-to-peer Architecture

作　　者：徐瑞东[1] 周建勇[1] 宋淑贞[1] 王博雅[1] 

机构地区：[1]中国矿业大学,信息与电气工程学院,江苏徐州221116

出　　处：《电力电子技术》2017年第8期104-108,共5页Power Electronics

基　　金：国家级大学生创新训练计划项目(152111624G);江苏省“六大人才高峰”高层次人才资助项目(ZNDW-004)~~

摘　　要：针对对等结构微网,采用一种分层控制策略。微网逆变器在孤岛和联网运行模式下均采用下垂控制,发生孤岛时无需改变控制算法;通过虚拟阻抗控制算法能重塑线路阻抗,提高功率解耦度,并在抑制电压谐波方面具有重要作用。二次电压和频率恢复控制以修复由于第1层本地控制引起的电压幅值和频率偏差;一种简单可靠的预同步控制算法实现孤岛模式向联网模式无缝切换。仿真和实验验证了控制策略的正确性和可靠性。A hierarchical control scheme for microgrid based on peer-to-peer architecture is proposed.Microgrid invert- ers are controlled in droop mode in the island and grid connected mode without switching the control algorithm when islanding condition is happened.The virtual impedance control can reshape the circuit impedance, improve the power decoupling degree, and has an important role in the suppression of voltage harmonics.The secondary control includes voltage amplitude and frequency recovery control can restore amplitude and frequency deviation produced by primary control.A simple and reliable pre-synchronous control scheme is uesed to realize seamless switching from islanded mode to grid connected mode.The correctness and reliability of the strategy are verified by simulation and experiment.

关 键 词：微网 逆变器 下垂控制 虚拟阻抗 

分 类 号：TM615[电气工程—电力系统及自动化]