基于全局预定时间终端滑模控制的独立光伏MPPT  

Global Predefined Time Terminal Sliding Mode Control for MPPT in a Stand-Alone Photovoltaic System

作　　者：王琰 刘崇新[2] WANG Yan;LIU Chong-xin(State Grid Jiangsu Electric Power Co.,Ltd.Wuxi Power Supply Company,Wuxi 214000,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网江苏省电力有限公司无锡供电分公司,江苏无锡214000 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《电工电气》2023年第4期6-11,52,共7页Electrotechnics Electric

基　　金：国家自然科学基金项目(51877162)。

摘　　要：基于PID控制的传统最大功率点跟踪(MPPT)的速度较慢,且在光照、负载迅速变化时往往会发生振荡,可能导致MPPT失败。为了提高MPPT的速度,改善MPPT的动态性能,将预定时间稳定性理论引入独立光伏MPPT中,建立了独立光伏系统模型,并通过变步长扰动观察法确定参考电压,基于李雅普诺夫稳定性理论,设计了全局预定时间终端滑模控制器,在预定时间内完成对参考电压的追踪并实现MPPT。通过仿真结果表明:提出的控制方法不仅能准确地在预定时间实现MPPT,还具备优良的动态性能和较强的鲁棒性;预定时间终端滑模控制器有助于系统在光照、负载发生大扰动时迅速、平滑地实现MPPT,具有较好的工程实际价值。The traditional Maximum Power Point Tracking(MPPT)based on PID control has slow speed and tends to oscillate during the rapid change of light and load,which may lead to the failure of MPPT.To solve these problems,the paper introduces the predefined time stability theory to MPPT of a stand-alone photovoltaic system.It first establishes a stand-alone photovoltaic system model and determines the reference voltage through variable step perturbation and observation method.Then based on the Lyapunov stability theory,a global predefined time terminal sliding mode controller is designed to track the reference voltage and complete MPPT within the predefined time.The simulation results show that this control method not only completes MPPT within the predefined time,but also has excellent dynamic performance and strong robustness.Besides,the predefined time terminal sliding mode controller is helpful for the system to complete MPPT fast and smoothly during the rapid change of light and load,verifying its great engineering application.

关 键 词：预定时间控制 滑模控制 最大功率点跟踪 独立光伏系统 

分 类 号：TM615[电气工程—电力系统及自动化] TM914.4