文章摘要
房志学,苏建徽,王华锋,等.微网逆变器低电压穿越控制策略[J].电力系统自动化,2019,43(2):143-149. DOI: 10.7500/AEPS20180408004.
FANG Zhixue,SU Jianhui,WANG Huafeng, et al.Low Voltage Ride-through Control Strategy of Microgrid Inverter[J].Automation of Electric Power Systems,2019,43(2):143-149. DOI: 10.7500/AEPS20180408004.
微网逆变器低电压穿越控制策略
Low Voltage Ride-through Control Strategy of Microgrid Inverter
DOI:10.7500/AEPS20180408004
关键词: 下垂控制  低电压穿越  不平衡故障  快速恢复
KeyWords: droop control  low voltage ride-through(LVRT)  unbalance fault  rapid recovery
上网日期:2018-09-30
基金项目:国家重点研发计划资助项目(2017YFB0903503)
作者单位E-mail
房志学 合肥工业大学电气与自动化工程学院, 安徽省合肥市 230009  
苏建徽 合肥工业大学电气与自动化工程学院, 安徽省合肥市 230009  
王华锋 全球能源互联网研究院有限公司, 北京市102209  
施永 合肥工业大学电气与自动化工程学院, 安徽省合肥市 230009 shiyongmail@yeah.net 
徐华电 合肥工业大学电气与自动化工程学院, 安徽省合肥市 230009  
摘要:
      微网逆变器一般采用下垂控制或虚拟同步机控制,其低电压穿越方式及特性与基于PQ控制的逆变器不同。下垂控制或虚拟同步机控制的逆变器低电压穿越的主要问题是在故障期间逆变器电压与电网电压之间不断产生相位的偏移,该相位偏移会严重影响并网电流恢复的速度。针对上述问题,提出一种在故障期间对功角等变量进行记忆保持的策略,使变量在故障前后基本保持一致,以实现故障后系统的快速恢复。针对故障期间产生的负序分量,采用在双同步旋转坐标系下对正、负序电流进行独立控制并引入电网电压前馈的方法。仿真和实验均验证了控制策略的正确性和有效性。
Abstract:
      The microgrid inverter is generally controlled by droop controller or virtual synchronous generator, and the methods and characteristics of low voltage ride-through(LVRT)are different from inverters with PQ controller. The main problem of the LVRT strategy of the microgrid inverter is phase shift between the inverter voltage and the grid voltage during the fault, which would greatly affect the recovery speed of the grid-connected current. To solve the problems above, a strategy for memory retention of variables such as power angle during faults is proposed so that the variables before and after the fault are basically consistent to achieve rapid recovery of the system after the fault. The positive and negative sequence currents are separately controlled in the double synchronous rotating coordinate system and the forward feeding of the grid voltage is introduced to eliminate the negative sequence component during faults. Both the simulation and the experiment verify the correctness and effectiveness of the control strategy.
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