Emergency elevator energy storage power supply

How to recover energy from elevator systems?

Energy recovery from elevators’ systems is proposed. Energy storage using supercapacitors and lithium-ion batteries is implemented. Bidirectional power flow is controlled to use the stored energy as auxiliary supply to the load without exchanging with the grid. Emergency energy level is maintained and used in automatic rescue situation.

Can energy efficient elevator systems save energy?

Both proposed systems offered emergency rescue features in addition to storing the regenerated energy from the elevator. Savings up to 20% of consumed energy in an “already” energy efficient elevator system is achieved through the proposed power sharing control strategy.

Why is energy recovery important in elevators & auxiliary power supply systems?

Energy recovery in elevators’ systems is vital to achieve higher efficiency. Leaps in power electronics industry enables complex and tight control algorithms for energy recovery and harvesting. Energy recovery and auxiliary power supply system is proposed and analyzed in this manuscript.

Which energy storage devices can be embedded on elevators?

Among the wide range of energy storage devices, only three are mature enough and well suited to be embedded on Elevators (i.e., batteries, supercapacitors and flywheels). Batteries have the best energy density, but a bad power density and provide slow dynamic cycles (more than 100 s).

Can supercapacitor energy storage be used for elevator emergency leveling?

Abstract: A new method of using supercapacitor energy storage to realize elevator emergency leveling is proposed. The supercapacitor is connected to the DC bus of the inverter through a series current limiting device for online charging and discharging.

What happens if a supercapacitor fails in an elevator?

When the elevator encounters an abnormal power failure, the four-quadrant inverter converts the DC power provided by the supercapacitor into a back-to-back power supply. The elevator system can be powered on again, and the emergency leveling action can be completed without changing the original control logic.