DESIGN OF CONTROLLER FOR GRID CONNECTED PHOTOVOLTAIC SYSTEM

Abstract

Growing environmental concerns and the depletion of conventional energy supplies reserves such as fossil fuel, photovoltaic energy sources have greatly increased in recent decades. Furthermore, this sort of power source offers other benefits such as low pollution, dependability, availability, no mechanical moving parts, less maintenance, a long-life span, and silence. More solar energy sources are expected to collaborate with a grid in the future. Aside from the low performance of a photovoltaic source of energy, the fundamental problem of a grid interfaced based photovoltaic system is its controllability. As the result, power energy produced from photovoltaic energy sources can be untracked at the maximum power point, if the system is not appropriately adjusted. Therefore, the optimization tracking techniques applied to the photovoltaic energy source become of high interest and always important for the sake of accomplishing excellent power quality and highest reliability. This dissertation presents the management active and reactive power of a single-phase PV system grid connected designed by an intelligent PSO-PID controller and hybrid fuzzy logic fraction order proportional-integral controller (FLCFOPI Controller). Intelligent PSO-PID Controller employed to MPPT to control PV voltage and optimize the performance of tracking power produced by PV panel, a hyperbolic cosine non-linear gain adds to the integral gain of PID controller to reduce large error in I-V characteristic curve of PV. The hybrid fuzzy logic fraction order proportional integral controller (FLCFOPI Controller) is employed to single-phase full-wave H-bridge voltage source inverter (VSI) with SPWM which aims to maintain dc-link voltage, unity power factor, and reduce voltage ripple. Single-phase lock loop (PLL) based 1/4 transport delay method is used to synchronize the phase of the PV- VSI with the grid-connected system. The proposed controller provides maximum active power into the grid while maintaining a power factor of unity, and it also allows for the modification of reactive power pumped into the system. The simulation result findings the proposed controller has a fast-settling time, robustness, and ability to tack grid power. For the validation of the effectiveness, efficiency, and validity of the proposed model the simulation results have been accomplished through MATLAB/ Simulink simscope power system.