Open AccessN IMPROVED VARIABLE STEP SIZE MPPT METHOD FOR PHOTOVOLTAIC ARRAY UNDER PARTIAL SHADING CONDITIONS
Author(s) -
Yi Yang,
Jessie Siaw Fei Lu
Publication year - 2021
Publication title -
journal of engineering and technological advances
Language(s) - English
Resource type - Journals
eISSN - 2811-4280
pISSN - 2550-1437
DOI - 10.35934/segi.v6i1.24
Subject(s) - maximum power point tracking , photovoltaic system , matlab , perturbation (astronomy) , control theory (sociology) , shading , maximum power principle , computer science , tracking (education) , power (physics) , mathematics , engineering , physics , artificial intelligence , psychology , pedagogy , computer graphics (images) , control (management) , quantum mechanics , inverter , electrical engineering , operating system
Photovoltaic (PV) systems are prone to partial shading effects, which cause multi-peak power points on the output curve, named local maximum power point (LMPP). The traditional perturbation and observation (P&O) algorithm will search into it when tracking maximum power. This paper proposes an improved variable step size (IVSS) perturbation tracking method to reduce the impact of perturbation step size choice on dynamic PV performance. MATLAB/Simulink software is used to develop and simulate the improved maximum power point tracking (MPPT) system. The IVSS tracking algorithm uses a program to achieve step perturbation. Finally, simulation results of the traditional P&O algorithm are compared with those achieved using the MPPT, verifying the superiority of proposed method in terms of tracking time, steady-state accuracy and maximum output power.