Abstract

This paper presents Normalized Least Mean Fourth (NLMF) based an adaptive reference current control technique in grid linked photovoltaic (PV) system for harmonic mitigation in the presence of utility-grid at the distribution terminals. The maximum power point scheme is utilized for maximizing the PV power by using an incremental conductance technique. The overall systemincorporates with PV plant, utility-grid, voltage source converter (VSC),and different types of linear & nonlinear loads. The VSC is interfaced with PVsystemthrough the common DC link busfor delivering the maximum PV power into utility-grid. An adaptive fuzzy tuned PID voltage controller is utilized to keep the DC bus voltage at a reference value. The proposed current controller is utilized for calculating the three-phase reference currents for harmonic mitigation in the presence of utility-grid. The overall system is validated on MATLAB/SIMULINK software platform under various transient conditions like steady-state, load removed and dynamic load conditions. The outcomes of the presented an adaptive current controller is found good and the currents of the utility-grid system are in the IEEE-519 standard limits.

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