Suzhou Electric Appliance Research Institute
期刊號： CN32-1800/TM| ISSN1007-3175

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基于全局預定時間終端滑?？刂频莫毩⒐夥麺PPT

來源：電工電氣發(fā)布時間：2023-04-26 10:26 瀏覽次數(shù)：312

基于全局預定時間終端滑模控制的獨立光伏MPPT

王琰1，劉崇新2
(1 國網(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 電氣工程學院，陜西 西安 710049)
 
    摘 要：基于 PID 控制的傳統(tǒng)最大功率點跟蹤 (MPPT) 的速度較慢，且在光照、負載迅速變化時往往會發(fā)生振蕩，可能導致 MPPT 失敗。為了提高 MPPT 的速度，改善 MPPT 的動態(tài)性能，將預定時間穩(wěn)定性理論引入獨立光伏 MPPT 中，建立了獨立光伏系統(tǒng)模型，并通過變步長擾動觀察法確定參考電壓，基于李雅普諾夫穩(wěn)定性理論，設計了全局預定時間終端滑模控制器，在預定時間內(nèi)完成對參考電壓的追蹤并實現(xiàn) MPPT。通過仿真結(jié)果表明：提出的控制方法不僅能準確地在預定時間實現(xiàn) MPPT，還具備優(yōu)良的動態(tài)性能和較強的魯棒性；預定時間終端滑?？刂破饔兄谙到y(tǒng)在光照、負載發(fā)生大擾動時迅速、平滑地實現(xiàn) MPPT，具有較好的工程實際價值。
    關鍵詞： 預定時間控制；滑?？刂疲蛔畲蠊β庶c跟蹤；獨立光伏系統(tǒng)
    中圖分類號：TM615 ；TM914.4     文獻標識碼：A     文章編號：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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