A battery storage device for distributed hybrid powered smart grid system and control method thereof

摘要

The present invention relates to a distributed hybrid powered smart grid system and control method thereof, which belongs to the technical field of new energy power generation and electrical technology. A flywheel set is used to adjust the frequency of grid-connected inverter power of the system so that power frequency fluctuation, compared with that of other grid-connected inverter power generation system, is reduced by 10%. Switching between constant charge and floating charge of batteries is realized by reasonable arrangement of the batteries, so service life of the batteries is extended by 20%. Capabilities of fault recovery and fault detection of the system are enhanced by control of the protective system, and service life of the system is 1000 h longer than that of systems without the protective system. Black start control of the system can enable the system to successfully and safely recover operation after the system completely shuts down, so recovery capability of the system is further improved, and impact to system loads and the grid because of overvoltage and overcurrent during system start is reduced. That smart grid system comprises as an essential component a battery storage having layers of battery packs connected to each other so that groups of them can be appropriately charged.