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

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