Abstract:
Non-linear loads are frequently used in both domestic and industrial applications. A non-linear
load connected to the grid produces currents with harmonic content. The voltage and current of
the grid are lowered in quality by these harmonics. A Proportional Integral-modified reduced
order generalized integrator-based frequency-locked loop (PI+MROGI-FLL) is developed for
controlling the interfacing inverter to mitigate the harmonics. The PI+MROGI-FLL is designed
to evaluate the three-phase reference currents by extracting the fundamental constituents from
the load currents. It offers many benefits, including improved harmonic mitigation, adaptive
frequency and phase, grid synchronisation, and minimal computational burden. The suggested
controller is modelled in MATLAB/Simulink using both a PV system and a hybrid system. The
proposed controller’s performance is compared with that of existing conventional controllers. In
comparison to other controllers, the PI+MROGI controller exhibits higher harmonic mitigation
capability
