基于固定时间滑模控制构网型柔性直流输电系统振荡抑制  

Oscillation Suppression of Grid-Forming VSC-HVDC System Based on Fixed-Time Sliding Mode Control

作　　者：朱思睿 王灿林 章德 李勇[3] 周洋 文汀 ZHU Sirui;WANG Canlin;ZHANG De;LI Yong;ZHOU Yang;WEN Ting(State Grid Hunan Electric Power Company Limited Economic and Technological Research Institute,Changsha 410007,China;Hunan Key Laboratory of Energy Internet Supply-Demand and Operation,Changsha 410007,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]国网湖南省电力有限公司经济技术研究院,湖南长沙410007 [2]能源互联网供需运营湖南省重点实验室,湖南长沙410007 [3]湖南大学电气与信息工程学院,湖南长沙410082 [4]长沙理工大学电气与信息工程学院,湖南长沙410114

出　　处：《湖南电力》2024年第4期84-92,共9页Hunan Electric Power

基　　金：湖南省科技创新领军人才项目(2023RC1038);国网湖南省电力有限公司科技项目(5216A2220011);湖南省科技创新平台与人才计划(2019TP1053)。

摘　　要：构网型柔性直流输电系统接入电网,实现对受端电网电压和频率的支撑。针对构网型柔性直流输电系统受端电网引起的振荡问题,提出固定时间滑模控制方法。首先,基于虚拟同步机控制,建立构网型柔性直流输电系统的数学模型。然后,基于滑模控制和固定时间稳定理论,提出非线性固定时间滑模控制方法以抑制系统振荡。通过李雅普诺夫理论证明了所提的非线性固定时间滑模控制能够实现柔性直流输电系统在固定时间内恢复稳定。最后,在MATLAB/Simulink中建立构网型柔性直流输电系统的仿真模型,验证所提方法在振荡抑制方面的有效性和优越性。The grid-forming voltage source converter based high voltage direct current(VSC-HVDC)system is connected to the grid,which supports the voltage and frequency of the grid.This paper focuses on the oscillation problem caused by the receiving end grid of grid-forming VSC-HVDC system and proposes a fixed-time sliding mode control method to damp the oscillation.First,a mathematical model of the grid-forming VSC-HVDC system is established based on virtual synchronous generator control.Then,a nonlinear fixed time sliding mode control method is proposed for oscillation suppression control according to the sliding mode control and fixed time stability theory.Furthermore,Lyapunov theory proves that the proposed nonlinear fixed time sliding mode control can realize the restoration of stability of the grid-forming VSC-HVDC system within the fixed time.Finally,a simulation model of the grid-forming VSC-HVDC system is constituted on MATLAB/Simulink and the simulation results verify the validity and superiority of the proposed method in oscillation suppression.

关 键 词：构网型柔性输电系统 虚拟同步机 振荡抑制 滑模控制 固定时间稳定 

分 类 号：TM721.1[电气工程—电力系统及自动化]