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基于全局預(yù)定時(shí)間終端滑模控制的獨(dú)立光伏MPPT

來源：電工電氣發(fā)布時(shí)間：2023-04-26 10:26 瀏覽次數(shù)：554

基于全局預(yù)定時(shí)間終端滑模控制的獨(dú)立光伏MPPT

王琰¹，劉崇新²

(1 國(guó)網(wǎng)江蘇省電力有限公司無錫供電分公司，江蘇無錫 214000；

2 西安交通大學(xué) 電氣工程學(xué)院，陜西西安 710049)

摘要：基于 PID 控制的傳統(tǒng)最大功率點(diǎn)跟蹤 (MPPT) 的速度較慢，且在光照、負(fù)載迅速變化時(shí)往往會(huì)發(fā)生振蕩，可能導(dǎo)致 MPPT 失敗。為了提高 MPPT 的速度，改善 MPPT 的動(dòng)態(tài)性能，將預(yù)定時(shí)間穩(wěn)定性理論引入獨(dú)立光伏 MPPT 中，建立了獨(dú)立光伏系統(tǒng)模型，并通過變步長(zhǎng)擾動(dòng)觀察法確定參考電壓，基于李雅普諾夫穩(wěn)定性理論，設(shè)計(jì)了全局預(yù)定時(shí)間終端滑模控制器，在預(yù)定時(shí)間內(nèi)完成對(duì)參考電壓的追蹤并實(shí)現(xiàn) MPPT。通過仿真結(jié)果表明：提出的控制方法不僅能準(zhǔn)確地在預(yù)定時(shí)間實(shí)現(xiàn) MPPT，還具備優(yōu)良的動(dòng)態(tài)性能和較強(qiáng)的魯棒性；預(yù)定時(shí)間終端滑模控制器有助于系統(tǒng)在光照、負(fù)載發(fā)生大擾動(dòng)時(shí)迅速、平滑地實(shí)現(xiàn) MPPT，具有較好的工程實(shí)際價(jià)值。

關(guān)鍵詞： 預(yù)定時(shí)間控制；滑模控制；最大功率點(diǎn)跟蹤；獨(dú)立光伏系統(tǒng)

中圖分類號(hào)：TM615 ；TM914.4 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2023)04-0006-06

Global Predefined Time Terminal Sliding Mode Control for

MPPT in a Stand-Alone Photovoltaic System

WANG Yan¹, LIU Chong-xin²

（1 State Grid Jiangsu Electric Power Co., Ltd. Wuxi Power Supply Company, Wuxi 214000, China;

2 School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China）

Abstract: 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.

Key words: predefined time control; sliding mode control; maximum power point tracking; stand-alone photovoltaic system

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基于全局預(yù)定時(shí)間終端滑模控制的獨(dú)立光伏MPPT