Patent ID: 7456523

Claim:
A power generation system comprising: a plurality of sets of direct current power sources; power converters which are connected to the direct current power sources to convert a direct current power into an alternating current power, wherein the power converters are connected in parallel to supply the alternating current power to a system power supply; and operation state setting means for setting, from among the power converters, a first power converter when started first as a master machine which is adapted to detect an islanding operation state in which power supply from the system power supply is stopped, and for executing setting so as to cause the remaining power converters not to detect the islanding operation state, wherein said operation state setting means is further constructed to set, from among the power converters excluding the first power converter, a second power converter when started second as a reserve master machine, and to execute settings so as to cause the remaining power converters not to be set to the reserve master machine, wherein when the master machine is not present among the power converters in operation or an operating mode of the master machine changes to a constant voltage operation mode, said operation state setting means is adapted to select the reserve master machine as the master machine, and wherein when an operating mode of the reserve master machine changes to the constant voltage operation mode, said operation state setting means is adapted to change the reserve master machine to another power converter.