Elevator control system and elevator control method

The invention relates to an elevator control system and an elevator control method. The elevator control method is used for controlling an elevator device with a lift car, a counterweight and a traction machine, wherein the traction machine adopts a synchronous motor as a traction motor. The elevator control system comprises an elevator control device for controlling the operation of the elevatordevice and a dynamic braking control device which enables the traction motor to generate a three-phase short circuit so as to dynamically brake the traction motor; and when the elevator control devicejudges that the braking force of a brake device of the traction machine is reduced, no specified load exists in the lift car and the lift car moves to the position above the top floor, then a dynamicbraking instruction is sent to the dynamic braking control device, and the dynamic braking control device enables the traction motor to be in three-phase short circuit according to the dynamic braking instruction of the elevat