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Design of Control Platform for Elevator Energy Feedback System

Author: ZhongChunBo
Tutor: FangChangShi
School: South China University of Technology
Course: Control Theory and Control Engineering
Keywords: elevator energy feedback PWM rectifier dual closed loop control SVPWM
CLC: TM461
Type: Master's thesis
Year: 2011
Downloads: 99
Quote: 1
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Abstract


In the context of energy saving and emission reduction policy, in order to increase the power efficiency and decrease the power losses, technological transformation on the traditional power devices through cutting-edge power electronic technologies has become a research hot spot. PWM rectifier boasts its capacities in bidirectional power flow, power factor correction and harmonics suppression. Thus, it is wildly applied in the update and innovation progress of power industry. Considering the drawback that the regenerative energy in current prevalent elevator cannot transmit back to the grid, this thesis aims at renovating the uncontrollable rectifier in the front stage of traditional frequency converter with the advanced PWM rectifier power feedback system, to send the regenerative power of elevator back to the grid. As a consequence, it makes great sense to the development of green energy saving elevator.This paper reviews the principles of elevator energy feedback system, builds up the model of three-phase voltage source PWM rectifier, and then introduces the corresponding control strategies. Together with the mathematical model of PWM rectifier in synchronous rotating coordinate, the dual closed-loop control configurations, both the currents inner loop and voltages outer loop, as well as their implementations by space vector pulse width modulation are put forward. On the basis of theoretical analysis, a simulation model of three-phase voltage source PWM rectifier is constructed by using Matlab/Simulink. The feasibility of the proposed control strategies is verified by the simulation results, which has enormous guidance significance in the design of sample machine.Furthermore, this project devises a control platform for the elevator energy feedback prototype based on hardware DSP+CPLD+IPM. Physical experiments are carried out by feeding the system to an elevator traction motor and other simulative loads, which manifest that the elevator energy feedback system has many desirable features, such as bidirectional power flow, sinusoidal input currents, high input power factor, and stable DC-link voltage. The experiment waveforms are in well accordance with the theoretical analysis and further consolidate the correctness of the control proposal and system design.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Rectifier
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