Effect of Randomized PI Controller in Off Grid Network

Abstract

Off-grid connection of photovoltaic (PV) system use power electronic components such as inverters and supply a non-linear load as users. This produce harmonics which adversely affect the power quality of the distribution network. A sinusoidal pulse width modulation (SPWM) of the voltage source inverter (VSI) is proposed to act as a switching pulse. The scheme to mitigate the harmonic problem and phase error in singlephase full bridge inverter is considered using low pass filter and current controller. The current control parameter using a conventional Proportional Integral (PI) is simulated. This is extended with the modification of control method where randomization control parameter technique is added to produce a more efficient current controller system by using a random integral gain to the system. Result shows the latter technique is better for reduction of harmonics rather than conventional PI controller technique.