NFTSM控制的光伏并网系统低压穿越控制策略  

LVRT Control Strategy for Photovoltaic Grid-connected System Controlled by NFTSM

作　　者：赵建文[1] 李洋 袁艺博 张钰冰 ZHAO Jianwen;LI Yang;YUAN Yibo;ZHANG Yubing(School of Electrical and Control Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学电气与控制工程学院,西安710054

出　　处：《电力系统及其自动化学报》2024年第5期27-36,47,共11页Proceedings of the CSU-EPSA

基　　金：陕西省自然科学基础研究计划资助项目(2023-JC-YB-308);国家自然科学基金资助项目(52074213)。

摘　　要：针对现有PI与ISMC控制下光伏并网系统LVRT过程响应速度慢、不对称故障时控制效果较差或抖振效果明显等问题,提出一种NFTSM控制的LVRT控制策略。考虑光伏并网系统外部条件多变的特性,采用双指数滑模超平面与控制率,选取指数趋近律加速趋近速率,构造出具有调节有功、无功输出的非奇异快速滑模控制器,并验证其稳定与收敛性,简单且有效地实现了光伏并网LVRT。Matlab/Simulink仿真结果表明,NFTSM控制的光伏并网LVRT具有收敛速度快、谐波含量低、抗外界干扰与抖振抑制能力强等优点。In view of the problems of a photovoltaic(PV)grid-connected system under the PI and ISMC control such as a slow response speed during the low voltage ride through(LVRT)process,a poor control effect under asymmetric fault and an obvious shake vibration phenomenon,an LVRT control strategy based on non-singular fast terminal sliding mode(NFTSM)control is proposed in this paper.Considering the characteristics of changeable external conditions for the PV grid-connected system,the double-exponential sliding mode hyperplane with a control rate is adopted,and the exponential approach law is selected to accelerate the approaching rate,so as to construct a non-singular fast sliding mode controller with adjustable active power and reactive power output.In addition,its stability and convergence are verified,thereby realizing the PV grid-connected LVRT simply and effectively.Matlab/Simulink simulation results show that the PV grid-connected LVRT controlled by NFTSM has advantages such as a fast convergence speed,a low harmonic content,strong resistance to external interference and a strong capability of shake vibration inhibition.

关 键 词：光伏并网 低电压穿越 积分滑模 非奇异快速终端滑模 谐波含量 抖振抑制 

分 类 号：TM743[电气工程—电力系统及自动化]