New elevator energy feedback control system design based on fuzzy PID controller

Aiming at reducing the elevator´s great energy consumption, this paper presents a new control system which can transform the energy that comes from the motor working at the generating state to the power grid. In this control system, because the conventional PI control cannot work efficiently at control of time variable and nonlinear objects, we adopted fuzzy-PID control. In this paper we gave the detail design process of the fuzzy-PID controller. The simulation results show that the output current power factor of the energy feedback control system is nearly 1, the elevator system´s interference on the power grid is minimized and through the comparison with the conventional PID control, we can see the advantage of the fuzzy-PID control in the elevator´s energy feedback control system.