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Research on Technology of Self-Controlled Soft Start with Variable Frequency for Synchronous Motor

Author: WangZuoHua
Tutor: XuDianGuo
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Synchronous motor Controlled inverter soft starter Rotor position Phase-locked loop Series thyristor valve group
CLC: TM341
Type: Master's thesis
Year: 2009
Downloads: 97
Quote: 0
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Abstract

Large-scale iron and steel enterprises blast furnace blowers commonly used high-power synchronous motor drag, but the high-power synchronous motor is difficult to start making its application has been largely restricted controlled inverter soft starter in all high-power synchronous motor way not only to control the motor free starts and stops and has the other starter unparalleled advantage of its starting time, starting current and power factor and so controllable, currently most of the domestic iron and steel enterprises to adopt self-control frequency soft starting device using imported equipment, the localization of the product has not yet appeared. Synchronous motor controlled inverter soft start device developed to conduct a more in-depth analysis and research, the main contents include the full realization of the digital control system, the whole position detector detects the position of the rotor, impact grid PLL design series thyristor valve group isolated synchronous trigger technology. Firstly, the operating principle of the AC - DC - AC inverter power supply current type of synchronous motor controlled frequency soft starting device elaborated complete control of all of the main converter circuit the TMS320F2812 DSP processor as the master chip communication and protection functions, and make full use of the software resources to conserve the integrity and reliability of the control system hardware consumption improve. Taken by the stationary rotor position the sudden excitation detection sensor polarity and magnitude of the counter electromotive force to determine the actual position of the rotor, in the low-speed running state using intermittent commutation EMF zero crossing detection in high-speed operation state to determine the actual rotor position, the load commutation, speed up to 95% of the rated into synchronous step process of shock grid voltage phase, frequency, amplitude lock engineering algorithms, 3kW motor control object in a lab environment The soft starter motor without position detector. Thyristor valve group for 10kV medium voltage applied to the high-power synchronous motor series, this paper also proposed a novel series thyristor valve manifold isolation synchronous trigger module implementations, AC and DC output control variable current source to pass through a high-pressure Toroid on cable access to the multi-way synchronization isolate the trigger signal, the isolation strength of up to 20kV, trigger synchronization error of less than 100ns, reliable the actual medium voltage projects in the field of application to prove the feasibility of this method.

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