Grid-Interconnected Solar Photovoltaic System for Power Quality Improvement Using Extended Reference Signal Generation Strategy

This research article exhibits a utility grid-interfaced solar photovoltaic (SPV) system for power quality enhancement. An adaptive proportional integral derivate (APID) controller with a unit vector template (UVT) is employed to generate a reference current signal of a shunt active power filter (APF). The UVT-based control scheme is used to separate the fundamental components from the load currents and to estimate the reference phase currents. These currents are used to generate pulse width modulation signal for the shunt APF. To maintain a constant dc link voltage of shunt APF, an APID controller is employed in the dc link voltage regulator. This extended reference signal generation scheme of shunt APF remarkably enhances the system performance and also diminishes the current and voltage harmonics in the power distribution system. The presented reference current generation scheme has been mathematically examined, and digital simulation results under different steady and dynamic states are presented. The SPV system is accomplished by utilizing the incremental conductance maximum power point technique and is interconnected with the utility grid. Finally, the entire system is validated through the real-time hardware prototype developed by using dsPIC30F4011.