DC/AC CONVERTER APPARATUS CONFIGURABLE AS GRID-CONNECTED OR STAND-ALONE AND POWER CONVERSION AND GENERATION SYSTEM COMPRISING SUCH DC/AC CONVERTER APPARATUS

摘要

A DC/AC converter apparatus comprising: .input terminals (10) to be connected to a DC power source; .a DC/AC conversion unit (11) adapted to receive input DC electrical power via the input terminals and to convert the input DC electrical power into AC electrical power, the DC/AC conversion unit comprising two output terminals (12); . two AC backup output terminals (14); .a switch arrangement (13) adapted to selectively connect the two AC output terminals to the grid terminals and to the two AC backup output terminals; .a control unit (16) associated to the switch arrangement and adapted to: - drive the switches of the switch arrangement, - sense when an AC voltage at the grid terminals is below a predetermined threshold; and - automatically drive the switches of the switch arrangement in such a way to disconnect the two AC output terminals from the grid terminals and to connect the two AC output terminals to the two AC backup output terminals when the AC grid voltage is below a said predetermined threshold.