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Research On The Reciprocal Power-fed AC Drive Test System For Electric Traction

Posted on:2008-08-15Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z W MaFull Text:PDF
GTID:1102360212492561Subject:Power system and its automation
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AC drive technology has been the evolution direction of railway locomotives and urban rail transit cars in China because of its economical and technical superiorities. AC drive test rigs with equivalent power are needed to provide good test site for the research, development and production of high power AC drive systems. So this dissertation makes some researches on a twin inverter-motor reciprocal power-fed AC drive test system.This dissertation expatiates on the work principle and energy conserving principle of the reciprocal power-fed test system, proposes the associated control strategy of twin motors based on vector control, and gives the small signal linear model of twin motors, which is the important reference of stability analysis and parameter selection. Simulation and test results show that twin inverter-motors reciprocal power-fed system using the above control strategy has good steady-state performance, good features of speed and load torque adjustment, the availability of emulating traction and braking condition tests of locomotives, and obvious energy saving effect.The voltage decoupling problem and the different voltage decoupling algorithms of vector control system are thoroughly analyzed, and by introducing the theory of sliding-mode variable structure control, a combined-type sliding-mode variable structure current controller is proposed for high-power voltage-decoupling vector control system. Mathematical anlysis and simulation results show that this current controller has not only the advantages of feedforward decoupling such as fast response and perfect decoupling, but also the advantages of siding mode control such as robustness and good anti-disturbance.This dissertation adopts double series system of four-quadrant converter at the DC source side of test system, and proposes predicted current control scheme based on phase-shifted SVPWM. Simulation and test results show that this four-quadrant converter has several advantages such as steady DC output voltage, high power factor and bidirectional power flow, and meets DC1500V power supply for the test system.The over-modulation problem of space vector pulse-width modulation (SVPWM) is thoroughly studied, and a new SVPWM algorithm with entire modulation range is proposed to unify the algorithms of linear modulation and over-modulation. Simulation and test results show that this new algorithm has simple structure and good practicability, and uses only one kind of algorithm to realize the smooth transient fromlinear modulation range, overmodulation range, to square waveform condition.This dissertation develops a converter control system including dual-DSP controlboard, intelligent IGBT driver board, etc., which achieves successful applications inboth four-quadrant converter and inverter.
Keywords/Search Tags:AC drive test system, four-quadrant converter, inverter, asynchronous traction motor, dual-DSP control board, vector control, sliding-mode variable structure control, space vector pulse-width modulation
PDF Full Text Request
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