  This paper presents a simulation approach to enhance the power quality of a
PV-micro hydro grid supplying both linear consumer load and non-linear
industrial load by integrating Shunt Active Power Filter (SAPF), utilizing
instantaneous PQ theory and hysteresis current control band logic. The
non-linear load draws reactive power and harmonic current from the source
thereby affecting the power quality. The integration of the SAPF at the point
of common coupling (PCC) offers reactive power and harmonic current
compensation, ensuring that the current supply to the grid remains nearly
sinusoidal and proportional to the active power. By injecting equal and
opposite harmonic components, the SAPF effectively reduces Total Harmonic
Distortion (THD) from 7% to 2.96%, thereby enhancing the overall power quality
of the PV-micro hydro grid system.
