Asymmetrical interval type-2 fuzzy logic control based MPPT tuning for PV system under partial shading condition

Pallavi Verma; Rachana Garg; Priya Mahajan

doi:10.1016/j.isatra.2020.01.009

Asymmetrical interval type-2 fuzzy logic control based MPPT tuning for PV system under partial shading condition

ISA Trans. 2020 May:100:251-263. doi: 10.1016/j.isatra.2020.01.009. Epub 2020 Jan 11.

Authors

Pallavi Verma¹, Rachana Garg², Priya Mahajan³

Affiliations

¹ Electrical Engineering Department, Delhi Technological University, New Delhi, India. Electronic address: pallaviverma_phd2k16@dtu.ac.in.
² Electrical Engineering Department, Delhi Technological University, New Delhi, India. Electronic address: rachana16100@yahoo.co.in.
³ Electrical Engineering Department, Delhi Technological University, New Delhi, India. Electronic address: priyamahajan.eed@gmail.com.

PMID: 31955950
DOI: 10.1016/j.isatra.2020.01.009

Abstract

The conventional maximum power point tracking (MPPT) algorithm shows best performance under uniform insolation but when photovoltaic (PV) array is partially irradiated, the Power vs Voltage (P-V) plot consists of multiple local maxima power point (LMPP) and one global maxima power point (GMPP). The conventional MPPT algorithm may track local peak and fluctuate around it, resulting in lower power tracking. To eradicate this drawback of conventional algorithm, the solar PV system requires the synthesis of modified controller which is able to discriminate between local and global peak point. Along with implementing modified MPPT controller, to minimise the adverse effect of partial shading on PV system, different PV array arrangements like series-parallel (SP), honey comb (HC), total cross tied (TCT) etc. may be used. Author(s) in the present study, has proposed asymmetrical interval type-2 fuzzy logic control (IT-2 AFLC) based MPP algorithm for tracking global peak in partial shading condition (PSC) with different PV array arrangements. The presented algorithm has been compared with other approaches viz. perturb & observe (P&O) and type-1(T-1) FLC for GMPP tracking, fill factor, shading losses, mismatch loss and efficiency to establish its superiority. For evaluating the efficiency of different algorithms, the EN50530 MPPT efficiency test has been performed under dynamic condition. The proposed algorithm has been developed under MATLAB/Simulink environment.

Keywords: IT-2 FLC; Partial shading condition; Perturb & observe; Photovoltaic system; Type-1 FLC.