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Research On Elevator Energy Efficiency Evaluation And Energy-saving Control Based On Ultracapacitor

Posted on:2013-06-30Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z H YaoFull Text:PDF
GTID:1222330392452547Subject:Power electronics and electric drive
Abstract/Summary:PDF Full Text Request
As a kind of high energy consumption special equipment, elevator has a hugeenergy saving potential. At present, the domestic elevator energy-saving technologiesand energy efficiency evaluation methods are currently in their infancy, and there areno relevant national standards. The unrealistic conclusions will be drawn out, ifcarrying out the domestic elevator graded energy efficiency evaluations using foreignstandards. Considering carbon emissions and trade protection measures, thedevelopment of our elevator industry will be restricted. Based on the backgroundabove, the technology of elevator energy conservation based on ultracapacitor and thenew method of energy efficiency evaluation are studied in this paper, aiming atproviding technical support for supervision and management of the elevator energyconsumption as well as promoting our country’s elevator energy saving technologydevelopment and elevator energy saving level.Firstly, a harmonic detection method based on FFT is adopted to detect thevoltage and current harmonics of the typical traction elevators with the energyfeedback device or not respectively. Then the harmonic characteristic of elevatorfeedback energy and the influence of the energy feedback device are analyzed bycomparing the measurement data. The results show that the bad effect of feedbackenergy can not be neglected. To reduce the harmonic pollution, the quality control andsupervision of the feedback device should be strengthened.Secondly, the elevator structure with ultracapacitor energy storage system isproposed and designed and the equivalent circuit models of ultracapacitor are built,such as debye polarization cell, transmission line model, lumped circuit model and soon. And on this basis, the ultracapacitor energy storage system is modeled. Twoworking modes for bidirectional DC/DC circuit are established and independentcontrol between upper and lower bridge arm is adopted. The PI controller is designedfor simulation to simulate the states of energy flow during elevator runtime.Thirdly, the power flow status in the four typical working conditions namely lightloading up/heavy loading down, light loading up/light loading down, high loading up/light loading down, and high loading up/heavy loading down is deduced and analyzedin detail. The working states of elevator (electro motion state energy consumption or generating state) are obtained in every start-stop and constant speed stage of the upand down process based on the torque curve. According to the results deduced above,the maximum regenerative energy of the elevator per reference stroke is proved to beequal to the potential energy when the elevator running from the top floor to thebottom floor with rated load. Based on theory above, the designing steps andparameters selecting methods of ultracapacitor are given.Finally, the energy consumption calculation model of elevator traction system isestablished by combining the dynamical model of elevator system andelectromagnetism model of Permanent Magnet Synchronous Motor (PMSM) together.Then the reliability of the model is verified by comparing the experimental data withthe calculation results. To solve the defects of foreign standards, the typeclassification of elevators and related parameters of energy efficiency evaluation areconfirmed based on the energy consumption calculation model and large quantities ofmeasured and survey data. Taking national conditions into account, a set of elevatorenergy efficiency evaluation procedures and methods is proposed.
Keywords/Search Tags:elevator energy saving technology, ultracapacitor, energyefficiency evaluation, energy feedback, super capacitor energy storage system, energymanagement, energy consumption calculation model
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