Patent ID: 9748796
Date: 2017-08-29
CPC Classifications: H02J,H02M,Y02B

Claim:
1. A multi-port energy storage system comprising: a bidirectional power conversion circuit formed with an AC side and a DC side; a DC-AC inverter circuit formed with a DC side and an AC side; an electric energy storage facility connecting between the DC side of the bidirectional power conversion circuit and the DC side of the DC-AC inverter circuit; a first AC port connecting with the AC side of the bidirectional power conversion circuit; a second AC port connecting with the AC side of the DC-AC inverter circuit; and an AC switch formed with a first side connecting with a utility power source or an AC power source and a second side connecting with the AC side of the bidirectional power conversion circuit, with the bidirectional power conversion circuit switching on the AC switch to connect the electric energy storage facility, the first AC port and the second AC port to the utility power source or the AC power source, with the bidirectional power conversion circuit switching off the AC switch to disconnect the electric energy storage facility, the first AC port and the second AC port from the utility power source or the AC power source; wherein when the utility power source or the AC power source stays within a normal tolerance, the AC switch is selectively switched on as a close state allowing the utility power source or the AC power source to directly supply an AC power to the first AC port and further to directly supply the AC power to the AC side of the bidirectional power conversion circuit, wherein the bidirectional power conversion circuit converts the AC power of the utility power source or the AC power source into a DC power to charge the electric energy storage facility and the DC power is further converted into an AC power by the DC-AC inverter circuit to supply to the second AC port; wherein when the utility power source or the AC power source stays within the normal tolerance, the AC switch is selectively switched on as a close state allowing the utility power source or the AC power source to directly supply the AC power to the first AC port while the bidirectional power conversion circuit converts the DC power stored in the electric energy storage facility into a first AC power to supply to the utility power source or the AC power source and the DC-AC inverter circuit converts the DC power stored in the electric energy storage facility into a second AC power to supply to the second AC port; and wherein when the utility power source or the AC power source is out of tolerance is in or failure, the AC switch is selectively switched off as an open state, wherein the bidirectional power conversion circuit converts the DC power stored in the electric energy storage facility into the first AC power to supply to the first AC port and the DC-AC inverter circuit converts the DC power stored in the electric energy storage facility into the second AC power to the second AC port.