Patent ID: 7482710
Filing Date: 2009-01-27
Classification: H02J

Abstract:
1. A power generation system comprising a plurality of unit power generation systems each of which supplies electric power generated by its generator to a load via a power converter and a breaker, wherein: a first unit power generation system includes a first power converter having a storage battery in its DC section, and each of the other unit power generation systems includes other power converters having no storage battery in its DC section, the power generation system further comprises a controller which first starts up the first unit power generation system using electric power generated by the first power converter, and then starts up the other unit power generation systems having no storage battery using electric power generated by the first unit power generation system which has already been started up, during a startup of the power generation system when an external power system has an abnormality or no external power is available, and the controller executes AC voltage control of the first power converter while letting a charging and/or discharging unit provided to the storage battery execute DC voltage control of its power converter so as to suppress DC voltage fluctuations caused by variations in the load and maintain balance of electric power.