Electric drive systems and energy management method

The present invention discloses an electric drive system, which includes an electrical energy storage system, power conversion system, the energy management system, and the AC drive system. Electrical energy storage system for providing or receiving electrical power. Power conversion system connected to the electrical energy storage system, for converting one into a power input output power. AC drive system is connected to the power conversion system for converting electrical energy output from the power conversion system into mechanical torque. The energy management system and the electrical energy storage system, power conversion system and communications AC drive system, for controlling the flow of energy in the energy storage system, power conversion system and the AC drive systems. The present invention also discloses a method for energy management. The electric drive system and energy management method disclosed by the present invention, can improve the efficiency of the electric drive system.