A multifunctional power processing unit for an off-grid PV diesel hybrid power system

In this paper a novel multifunctional power processing unit capable of extracting maximum power from solar photovoltaic panels is described. It employs a combination of a voltage controlled voltage source inverter (VCVSI) and a current controlled voltage source inverter (CCVSI), connected in series on the DC side and in parallel on the AC side Chem Nayar et al. (2003), H. Dehbonei et al. (2002), H. Dehbonei (2003). This power processing unit is able to provide an uninterruptible power supply feature, load voltage stabilisation, unity power factor operation, maximum power point tracking, higher efficiency for charging the battery from renewable energy sources and more reactive power support. The experimental results from the prototyped system confirm the validity of the proposed topology.