This paper presents the design and performance analysis of a three-phase single stage solar
photovoltaic integrated unified power quality conditioner (PV-UPQC). The PV-UPQC
comprises shunt and series connected voltage compensators linked back-to-back with a
common DC-link. The shunt compensator serves a dual role, extracting power from the PV
array and compensating for load current harmonics. An improved synchronous reference frame
control, based on a moving average filter, is employed for extracting the load active current
component, enhancing the PV-UPQC's performance. The series compensator addresses grid
side power quality issues such as voltage sags and swells by injecting voltage in-phase or out
of phase with the point of common coupling (PCC) voltage during sag and swell conditions,
respectively. This proposed system harnesses the benefits of clean energy generation while
enhancing power quality. The steady-state and dynamic performance of the system are
evaluated through simulations in Matlab-Simulink under nonlinear load conditions.
Furthermore, the system's performance is validated using a scaled-down laboratory prototype
subjected to various disturbances including load unbalancing, PCC voltage sags/swells, and
irradiation variations.