荆楚理工学院学报2025，Vol.40Issue(6)：11-18,8.
解耦双同步坐标系下低压穿越控制策略
Low Voltage Ride-through Control Strategy in Decoupled Double Synchronous Reference Frame
陈鹏宇1
作者信息
- 1. 湖北汽车工业学院机器人与自动化学院,湖北 十堰 442002
- 折叠
摘要
Abstract
To enhance the stability of grid-connected photovoltaic(PV)systems during grid voltage sags,this paper investigates a grid-connected system composed of a boost converter and a two-level inverter.By analyzing the impact of grid voltage sags on PV grid-connected systems under traditional control strategies,it is concluded that DC-link overvoltage and grid-side current overload are the main causes of low voltage ride-through(LVRT)failure.To address this issue,this paper adopts a third-order decoupled double synchronous reference frame phase-locked loop(DDSRF-PLL)to improve system synchronization accuracy.During LVRT,the calculation method for active current is reconstructed,and dynamic adjustment of reactive current is achieved by using a piece-wise function to accelerate grid voltage recovery.By introducing point of common coupling(PCC)voltage feedforward control,the negative sequence components during voltage sags are effectively suppressed.Simulation results demonstrate that the proposed con-trol strategy can effectively avoid LVRT failures and ensure compliance with grid-connection requirements.关键词
低电压穿越/解耦双同步坐标系锁相环/电压前馈控制/无功电流调节/电压恢复Key words
low voltage ride-through(LVRT)/decoupled double synchronous reference frame phase-locked loop(DDSRF-PLL)/voltage feedforward control/reactive current regulation/voltage recovery分类
信息技术与安全科学引用本文复制引用
陈鹏宇..解耦双同步坐标系下低压穿越控制策略[J].荆楚理工学院学报,2025,40(6):11-18,8.
