电力系统自动化2019，Vol.43Issue(2)：143-149,161,8.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
摘要
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 PQcontroller.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.关键词
下垂控制/低电压穿越/不平衡故障/快速恢复Key words
droop control/low voltage ride-through (LVRT)/unbalance fault/rapid recovery引用本文复制引用
房志学,苏建徽,王华锋,施永,徐华电..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):143-149,161,8.基金项目
国家重点研发计划资助项目 (2017YFB0903503).This work is supported by National Key R&.D Program of China (No. 2017YFB0903503). （2017YFB0903503）
