Improved Proportional-Integral Coordinated MPPT Controller with Fast Tracking Speed for Grid-Tied PV Systems under Partially Shaded Conditions

Haidar Islam, Saad Mekhilef, Noraisyah Mohamed Shah, Tey Kok Soon, Addy Wahyudie and Mahrous Ahmed
Additional contact information
Haidar Islam: Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Saad Mekhilef: Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Noraisyah Mohamed Shah: Department of Electrical, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Tey Kok Soon: Department of Computer System & Technology, Faculty of Computer Science & Information Technology, University of Malaya, Kuala Lumpur 50603, Malaysia
Addy Wahyudie: Department of Electrical Engineering, United Arab Emirates University, P.O. Box 15551, Al Ain, UAE
Mahrous Ahmed: Department of Electrical Engineering, College of Engineering, Taif University, Taif 219744, Saudi Arabia

Sustainability, 2021, vol. 13, issue 2, 1-27

Abstract: When a photovoltaic (PV) system is exposed to physical objects and cloud coverage and connected to bypass diodes, a partial shading condition (PSC) occurs, which causes a global maximum power point (GMPP) and numerous local maximum power points (LMPPs) on the power-voltage (P-V) curve. Unlike conventional MPPT techniques that search for multiple LMPPs on the P-V curve, it is possible to track GMPP straightaway by designing a simple but robust MPPT technique that results in faster tracking speed and low power oscillations. Hence, in this study, an improved proportional-integral (PI) coordinated Maximum Power Point Tracking (MPPT) algorithm is designed to enhance the conversion efficiency of a PV system under PSC with fast-tracking speed and reduced power oscillations. Here, PI controllers are used to mitigating the steady-state errors of output voltage and current of PV system that later on passed through an incremental conductance (INC) algorithm to regulate the duty cycle of a dc–dc boost converter in order to ensure fast MPPT process. The PV system is integrated with the grid through an H-bridge inverter, which is controlled by a synchronous reference frame (SRF) controller. Tracking speed and steady-state oscillations of the proposed MPPT are evaluated in the MATLAB/Simulink environment and validated via a laboratory experimental setup using Agilent solar simulator and dSPACE (DS1104) controller. Results show that the proposed MPPT technique reduces the power fluctuations of PV array significantly and the tracking speed of the proposed method is 13% and 11% faster than the conventional INC and perturb and observe (P&O) methods respectively under PSCs.

Keywords: MPPT; PWM; partial shading condition; PV; grid-connected; incremental conductance and PI (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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