Energy management system and method for gas-electric hybrid power ship

The embodiment of the invention discloses a gas-electric hybrid power ship energy management system and method. Through the system, a shore power supply device, a lithium battery power supply device and a gas generator power supply device are arranged, and the switching-on or switching-off states of a first switching-on and switching-off switch, a second switching-on and switching-off switch and a third switching-on and switching-off switch under different working conditions of a ship are controlled; the energy requirements of the shore power supply device and/or the lithium battery power supply device and/or the gas generator power supply device under the berthing working condition, the berthing working condition, the sailing working condition and the sailing working condition of the ship are met, and due to reasonable cooperation, the energy utilization rate can be increased while energy supply of the ship is ensured; and the gas generator power supply device is started to supply power only when the lithium