COMPENSATION FOR REACTIVE POWER AND HARMONIC CURRENTS DRAWN BY NON-LINEAR LOAD IN PV-MICRO HYDRO GRID

Abstract

This project proposes a method to improve the power quality of a PV micro hydro grid by utilizing instant PQ theory and hysteresis current control band logic. The main goal is to mitigate harmonics and ensure reliable utility power supply. This is achieved through the use of a shunt active power filter, which acts as a current source and cancels out harmonics by injecting equal and opposite harmonic components at the grid connection point. The proposed system includes a shunt active power filter with an inverter that employs the instantaneous PQ theory algorithm to generate reference current. The hysteresis band current control logic utilizes the reference current in the a-b-c frame to generate appropriate gate signals for the inverter, ensuring that the current drawn from the inverter tracks the reference currents within a specified band, thereby compensating for the non-linear load. The MATLAB-Simulink Toolbox is used to simulate the shunt active power filter in order to demonstrate its efficiency and adaptability. The simulation considers two different types of loads to validate the effectiveness of the proposed scheme. The simulation results are analyzed and evaluated. Overall, the project aims to design a system that can compensate for reactive power and harmonic current consumed by the load. By ensuring nearly sinusoidal current in proportion to the active power, the system aims to improve the power quality of the PV micro hydro grid.