Super Capacitor-based Elevator Energy Saving Technology Research And Realization

Elevators are supposed to be a giant energy-consuming part in modern construction. The energy released in traditional elevators is usually consumed by high power resistors, which results in a huge waste. However, by adopting elevator energy-saving system, it can be stored in super-capacitors in elevators for reusing and promotes energy recycling, thus bringing considerable social and economical benefits.This thesis explores and designs an elevator energy-saving system based on super-capacitors that are applied to save and reuse regenerated energy in elevators.Firstly, a profound research is conducted on energy-saving technology, followed by the presentation of a design to reproduce energy through super-capacitors in elevators. Meanwhile, the features of super-capacitors and the effect of capacitance deviation rate on energy storage modules are closely analyzed. The basic design of the energy-saving system involves three aspects, its general structure, hardware system and software system. The calculation and selection of key apparatuses are made, including the selection and design of a super-capacitor and a bi-directional DC/DC converter, with a quantitative analysis on regeneration in actual elevator experimental platform. Moreover, the controlling mode and principles of the bi-directional DC/DC converter are evaluated so as to bring in the double closed-loop controlling project.As for hardware, this thesis completes the tasks of voltage-sharing in super-capacitors, peak absorption and propulsion in switching tubes, hardware protection, signal sampling, signal adjustment and communication, display circuit design, and the selection of main apparatuses.For software, this thesis provides a design of the energy-saving software system and realizes control algorithm, in which the flow chat of main program and subprograms are introduced, and the software programming and debugging are accomplished.Finally, a joint debugging between energy-saving and elevator system is achieved through the flat base of an actual elevator controlling system in laboratory, which suggests that the super-capacitor energy storage system could be charged and recharged through stable operation of the controller, and that it is feasible to achieve energy recycling by super-capacitors and realize its reusing.