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Research on Induction Motor Variable Frequency Starting Power Supply

Author: FangWeiJia
Tutor: ChaoZeYun
School: Huazhong University of Science and Technology
Course: Electrical Engineering
Keywords: online UPS BOOST double loop SVPWM
CLC: TM343
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
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Abstract


Sudden power failure is an objective reality. When the power is down, it is vitally important to provide uninterrupted power supply. Special three-phase online uninterruptible power supply is an essential device on ship. This article talks about supply unit used as starting turbo generator accessories oil pumps and diesel generator pumps. According to the circuit,it can be divided into two parts: BOOST and three-phase inverter. Outer voltage inner current control loop guarantees the stability of output voltage in large range of input voltage. The double loop control can also export stable three-phase sine voltage in the sudden change of load.induction motor VF starting can be done by SVPWM.This article not only derives BOOST small-signal model, concludes system transfer function and designs the circuit parameters, but talks about and analyzes the influence of right half plane zero. The control strategy of double loop can make us get less fluctuation of output voltage between the switching from195V~255V to 463V~546V which improves the dynamic performance of the system. Controller is designed. Simulation and experimental can be found in the text.The model of three-phase inverter in different coordinate system can be got in the text. After decoupling in dq0 coordinate system, inner inductor current loop outer voltage control loop has been chosen which can realize the restriction of inductor current and enhance the system dynamic performance. Simulation is given in the text.System hardware is analyzed and designed in the text .Programs are written. Double loop BOOST control and VVVF induction motor starting based on 50Hz three-phase inverter by using SVPWM are done.

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CLC: > Industrial Technology > Electrotechnical > Motor > AC motor > Induction motor
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