Title: Active disturbance rejection control of three-phase grid-connected photovoltaic systems

Authors: Hezheng Li; Jing Bai; Shunshoku Kanae; Yanxi Li; Lin Yue

Addresses: College of Electrical and Information Engineering, Beihua University, Jilin 132000, China ' Science and Technology Park of Beihua University, Beihua University, Jilin 132000, China ' Department of Medical Engineering, Junshin Gakuen University, Fukuoka, Japan ' College of Electrical and Information Engineering, Beihua University, Jilin 132000, China ' College of Electrical and Information Engineering, Beihua University, Jilin 132000, China

Abstract: In this paper, a three-phase grid-connected photovoltaic system based on active disturbance rejection controller (ADRC) is proposed to solve the problem of voltage instability which is caused by many internal uncertainties and external disturbances. A tracking differentiator is used to arrange the transient process to reduce the initial error, which solves the problem of large overshoot. The extended state observer is used to estimate the internal and external total disturbances in real-time, and adopts a linearisation technique via dynamic compensation process, which can reject internal and external disturbances effectively. The simulation experiments show that ADRC has better performance than PI controller in reducing power loss and rejecting disturbances.

Keywords: three-phase grid-connected photovoltaic system; tracking differentiator; extended state observer; ESO; internal and external disturbances.

DOI: 10.1504/IJMIC.2019.105973

International Journal of Modelling, Identification and Control, 2019 Vol.33 No.3, pp.225 - 236

Received: 29 Jun 2019
Accepted: 17 Jul 2019
Published online: 23 Mar 2020 *

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