Single-phase grid-tied photovoltaic system with boost converter and active filtering

This paper deals with a single-phase grid-tied photovoltaic system, which can operate, simultaneously, as shunt active power filter and injecting active power into the grid. The photovoltaic system is composed of DC/DC step-up (boost) converter and full-bridge DC-AC converter, performing both reactive power compensation and harmonic current suppression generated by nonlinear loads. The photovoltaic system is implemented utilizing an equivalent electric model, and its maximum power point is tracked by means of P&O algorithm, which is used to control the DC-DC step-up converter. The algorithm adopted to obtain the current reference of the DC-AC converter is based on the synchronous reference frame (SRF) method. Furthermore, an anti-islanding technique is implemented, in order to guarantee the safe operation of photovoltaic system. Simulation results are present to validate the proposed control strategy, and to verify the system feasibility.