Patent ID: 8269372
Filing Date: 2012-09-18
Classification: H01M,H02J,H02S,Y02E

Abstract:
1. A PV-FC hybrid generation system, comprising: a PV DC/DC converter unit for converting a PV output voltage from a photovoltaic cell into a predetermined voltage; an FC DC/DC converter unit for converting an FC output voltage from a fuel cell into a predetermined voltage; a DC link unit commonly connecting an output terminal of the PV DC/DC converter unit and an output terminal of the FC DC/DC converter unit, and linking the converted PV output voltage from the PV DC/DC converter unit to the converted FC output voltage from the FC DC/DC converter unit to thereby generate a DC voltage; a DC/AC inverter unit for converting the DC voltage from the DC link unit into a predetermined AC voltage; a voltage/current detection unit for detecting a plurality of voltages and currents generated by the fuel cell, the photovoltaic cell, and the DC/AC inverter unit, and for detecting output voltages from the PV DC/DC converter unit and the FC DC/DC converter unit; and a hybrid generation control unit for controlling operations of the PV DC/DC converter unit, the FC DC/DC converter unit, and the DC/AC inverter unit on the basis of the plurality of voltages and currents detected by the voltage/current detection unit, wherein the voltage/current detection unit comprises the FC output voltage and output current from the fuel cell, the PV output voltage and output current from the photovoltaic cell, output currents from the PV DC/DC converter unit and the FC DC/DC converter unit, the DC voltage from the DC link unit, the AC voltage and output current from the DC/AC inverter unit, and a grid voltage from a grid of a commercial power supply, the hybrid generation control unit comprises: the PV converter controller, the FC converter controller, and the inverter controller each adapted to determine a photovoltaic generation status according to a PV power obtained by calculation using the PV output voltage and the output current from the photovoltaic cell after a grid-connected operation starts, and perform one of predetermined first and second grid-connected control modes according to the determined photovoltaic generation status, the first grid-connected control mode is a control mode when photovoltaic generation is not being carried out in a grid-connected operation mode, and the second grid-connected control mode is a control mode when photovoltaic generation is being carried out in the grid-connected operation mode, and the inverter controller comprises: