Harmonic compensation as ancillary service of a grid-connected photovoltaic power system

In this paper, an harmonic current compensation as ancillary service (AS) of a distributed generation (DG) connected in a distribution network is studied, aiming at the improvement of power quality (PQ). This compensation is performed by operating the three-phase inverter, whose dc bus is connected to the photovoltaic (PV) generator, acting as active power filter (APF) and DG. The control strategy is based on synchronous dq reference method. A P&O algorithm is used for maximum power tracking, along with a control algorithm for dc bus voltage. To validate the study, experimental results were obtained in an experimental setup.