COMPENSATION FOR REACTIVE POWER AND HARMONIC CURRENTS DRAWN BY NON-LINEAR LOAD IN PV-MICRO HYDRO GRID
Date
2023-04
Authors
Thapa, Ajay
Karmacharya, Raisha
Nepal, Raj Krishna
Khatiwada, Sanket
Journal Title
Journal ISSN
Volume Title
Publisher
I.O.E. Pulchowk Campus
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.
Description
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.
Keywords
PQ theory,, MATLAB, REACTIVE POWER