一种微网并网与孤岛运行无缝切换的优化控制方法  

An Optimal Control Method for Seamless Handover between Grid Connected and Islanding Operation

作　　者：张玉鹏 王云亮 ZHANG Yu-peng;WANG Yun-liang(School of Electrical Electronics Engineering,Tianjin University of Technology,Tianjin 300384 China;Tianjin Key Laboratory for Control Theory & Application in Complicated System,Tianjin University of Technology,Tianjin 300384 China)

机构地区：[1]天津理工大学电气电子工程学院,天津300384 [2]天津市复杂系统控制理论及应用重点实验室,天津300384

出　　处：《自动化技术与应用》2019年第1期86-90,共5页Techniques of Automation and Applications

摘　　要：本文以风光互补发电微网系统作为研究对象,针对微网系统在并网与孤岛运行模式切换时的电压波动及电流冲击问题,分析了风光互补发电微网系统的结构和运行特性,选择了每种运行模式下的控制方法。在并网运行模式下储能单元采用PQ控制,微网系统的频率和相位由电网提供。在独立运行模式下采用改进的V/f下垂控制策略,通过控制储能装置变流器的输出电压及频率,为风光发电单元提供频率和相位。其次,增加了预同步处理单元,从而消除切换过程中的冲击。最后,在PSCAD/EMTDC仿真软件平台上搭建风光储互补的微网模型,仿真结果证明,该控制策略有效实现了微电网的无缝切换。The micro-grid system based on wind and solar hybrid power generation is studied in this paper.Aiming at the voltage fluctuation and current impact of micro-grid operating mode switching,this paper puts forward a method of operation in each mode based on the structure and characteristics.Under the grid-connected mode,micro-grid adopts PQ control. Frequency and phase of micro-grid system is provided by the grid.Under independent mode,the improved droop V/ f control strategy is employed to battery,by controlling the energy storage device of the inverter output voltage and frequency,providing frequency and phase for scenery power generation unit.Secondly,in order to eliminate the impact during switching,a pre synchronization processing unit is added.Finally,a model of micro-grid composed of complementary wind farm,solar generation and energy storage system is constructed on PSCAD/EMTDC platform,and the feasibility of the proposed control strategy is verified by simulation results.

关 键 词：微网 风光储互补 PQ控制 V/f下垂控制策略 无缝切换 

分 类 号：TM76[电气工程—电力系统及自动化]