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Research on the Soft Starter with Discrete Frequency Variable Capability

Author: GuoDeSheng
Tutor: XuDianGuo
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Asynchronous motor Soft starter Thyristor Discrete Variable Frequency
CLC: TM573
Type: Master's thesis
Year: 2007
Downloads: 134
Quote: 1
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Abstract


Soft starter motor soft start and soft stop light load and energy, and a variety of protection features in one of a set of new motor control device, compared to the traditional starter, it highlights the advantages reflected in the output voltage is continuously adjustable, able stepless adjustment motor starter, the impact of torque and the impact of current, easy to control, and the small size. With the development of power electronics components, asynchronous motor soft start technology matures, more and more. In this paper, the analysis of the development status of the soft starter technology, access to large number of domestic and foreign literature, the multiple functions of the soft starter and independently developed a soft start equipment. The research topics include: analysis under the control of the dynamic model of the asynchronous motor soft starter asynchronous motor soft starter in the equation of state, and the establishment of a simulation model of the soft starting system. By comparing the simulation results with actual measurements under different firing angle, to verify the accuracy of the simulation model built. Built simulation model based on the fundamental amplitude of the output voltage using the expected value as the output voltage. Obtained by the quantitative analysis of the output voltage as a soft starter, the firing angle, the approximate relationship between the freewheeling angle and the output voltage fundamental amplitude. As a theoretical basis to achieve asynchronous motor soft start ramp voltage, current limit start and soft stop function. In addition, we also study the induction motor fault detection and inverse time operation characteristic, the the motor abnormalities state fault protection function. In addition to the basic soft start and its failure protection function in order to improve the soft starting torque of the motor, to broaden the scope of application of the soft starter, the system also increases the discrete variable frequency soft-start function. Obtained through the analysis of discrete variable frequency spectrum of the output voltage and three-phase voltage fundamental phase in a discrete variable frequency motor starting torque. And this choice based on the transition frequency inverter soft start asynchronous motor discrete variable frequency soft starter. In addition, the paper also negative effects of discrete variable frequency soft start research, put forward some corresponding improvement measures and solutions. Finally, the paper developed a soft starter with discrete frequency control system, the entire system of hardware and software implementation, and experimental research. The new soft-start controller both soft starter excellent performance and meets the requirements of the heavy start.

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CLC: > Industrial Technology > Electrotechnical > Electrical > Controllers,contactors, starters,solenoid > Starter
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