Publication

A Supercapacitor-Based Energy Storage System for Elevators with Soft Commutated Interface

Alfred Rufer
2001
Conference Papers

Abstract

In recent years, power variations and energy criteria has been the main motivation for developing regenerative drive converters for elevators [1]. A more performant solution for power-smoothing can be easily found by using a supercapacitor based storage device, connected to the intermediary circuit of a Variable Speed Drive system. In this paper, power and energy considerations are made for the design of the storage tank and regarding the maximum power demand from the feeding network. For the power-conversion circuit, which is necessary to compensate the voltage variations of the supercapacitors by descharging and charging, a high efficiency converter topology is proposed which allows the bidirectionnal energy flow under soft-commutation conditions, and offers also a good flexibility for the optimal sizing of the supercapacitor voltage level. The typical behaviour of the special converter is given, together with an analyse of the advantages related to the specific application.

Official source

https://infoscience.epfl.ch/entities/publication/55a33a13-dda7-4057-a241-27b411b7140d

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Alfred Rufer
2001
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/55a33a13-dda7-4057-a241-27b411b7140d

About this result

Related concepts (32)

Variable-frequency drive

A variable-frequency drive (VFD, or adjustable-frequency drives, adjustable-speed drives), variable-speed drives, AC drives, micro drives, inverter drives, or drives) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the input electricity. Depending on its topology, it controls the associated voltage or current variation. VFDs are used in applications ranging from small appliances to large compressors.

Power electronics

Power electronics is the application of electronics to the control and conversion of electric power. The first high-power electronic devices were made using mercury-arc valves. In modern systems, the conversion is performed with semiconductor switching devices such as diodes, thyristors, and power transistors such as the power MOSFET and IGBT. In contrast to electronic systems concerned with the transmission and processing of signals and data, substantial amounts of electrical energy are processed in power electronics.

Power inverter

A power inverter, inverter or invertor is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). The resulting AC frequency obtained depends on the particular device employed. Inverters do the opposite of rectifiers which were originally large electromechanical devices converting AC to DC. The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry. The inverter does not produce any power; the power is provided by the DC source.

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