Performance of the elevator inverter with the super capacitor energy storage

The paper presents a super capacitor energy storage device to recycle the power with regenerative braking which the elevator inverter generates. During the running of the elevator, the fluctuation of DC bus voltage is greater, this will impact on grid greatly, especially on energy feedback. It will disturb user electricity distribution system and endanger the operation of power system. Through switching control of the Bi-directional DC/DC converter, the converter can control charge and discharge of the super capacitor. When the elevator inverter generates a power with regenerative braking, the power energy is charged to the super capacitor. it discharges the energy power when the elevator is accelerated or load is added to the elevator. Experimental results carried out on a 10-kW elevator inverter are presented.