电力系统及其自动化学报2019，Vol.31Issue(4)：123-131,9.DOI:10.3969/j.issn.1003-8930.2019.04.018
四桥臂SVG改进电流检测方法及控制策略
Improved Current Detection Method and Control Strategy for Four-leg SVG
李勇 1刘宏 1刘乾易 1谢斌2
作者信息
- 1. 湖南大学电气与信息工程学院,长沙 410082
- 2. 湖南大学电气与信息工程学院,长沙 410082
- 折叠
摘要
Abstract
At present,static var generator(SVG)is widely used to solve the problem of unbalanced three-phase current in low-voltage distribution network.In this paper,the current detection algorithm and control strategy for a four-leg SVG were improved.First,the zero-sequence component of unbalanced current was separated based on dq0 detection algorithm. Then,the negative-sequence component was obtained through dq transformation,and the fast detection of un?balanced components was realized accordingly.At the same time,the phase locked loop(PLL)based on the transfor?mation of double-dq frame was designed to precisely lock the phase of grid voltage.Using this detection algorithm and adaptive hysteresis current control mode,a prototype of improved four-leg SVG was designed.Both simulation and ex?perimental results demonstrated that the improved detection algorithm was more accurate and faster;meanwhile,the in?troduction of adaptive hysteresis control effectively overcame the deficiency of unstable frequency in the traditional hys?teresis control.关键词
三相不平衡/四桥臂静止无功发生器/锁相环/电流检测/自适应滞环Key words
unbalance of three-phase/four-leg static var generator(SVG)/phase locked loop(PLL)/current detec⁃tion/adaptive hysteresis分类
信息技术与安全科学引用本文复制引用
李勇,刘宏,刘乾易,谢斌..四桥臂SVG改进电流检测方法及控制策略[J].电力系统及其自动化学报,2019,31(4):123-131,9.
