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This paper presents a current sensor-less flyback inverter controlled by MPPT for a photovoltaic (PV) small power system. Although the proposed system has such small output power as 300 Watts, a few sets of PV small power systems can be easily connected in parallel for the higher output power requirements. When a PV system is constructed by a lot of small power ones, the total system-cost will become a matter of concern. To overcome this difficult problem, this paper proposes that no expensive dc current sensor is used in the PV system and the PV current can be estimated from the PV voltage. This novel current sensor-less flyback inverter is applied to the PV system operated by MPPT, which shows the satisfactory MPPT-performance as well as the system with a dc current sensor. This paper also treats the design method and the operation of the unique flyback inverter with center-taped secondary winding. Finally, the parallel inverter system in which the outputs of the inverters connect each other is constructed, and the experimental results show that the parallel system gets larger power than the conventional one when the PV array is partially shaded by buildings.
Research papers (publications of university or research institution)
