Electric control system, method and device for operation machine and operation machine

The invention provides an electric control system, method and device for an operation machine and the operation machine. The electric control system for the operation machine comprises an electric leakage protection cabinet, an active rectification module, a battery management module, a motor controller and a whole vehicle controller. The electric leakage protection cabinet, the active rectification module, the battery management module and the motor controller are electrically connected in sequence, and the electric leakage protection cabinet, the active rectification module, the battery management module and the motor controller are electrically connected with the whole vehicle controller. The electric leakage protection cabinet is electrically connected with a three-phase power grid, and the motor controller is electrically connected with a motor of the operation machine. The leakage protection cabinet is set to control the connection state with the three-phase power grid based on the measured leakage curr