感应电机电源切换中残压和电压差的研究及最优切换策略

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Abstract In order to suppress the inrush problems during the power switching of induction motor as much as possible under the different alternate power sources, it is necessary to select the optimal power switching method and determine the best switching moment with the consideration of the action time of the switch. Therefore, the stator residual voltage after the power off, the voltage difference and the phase-angle difference between the residual voltage and the voltage of the different alternate sources should be quantificationally researched more accurately. Firstly, it is found that there are two operation stages of motor based on the test wave of stator currents after the power off, that is, the short stator two-phase asymmetrical transient process and the rotor freedom operation. And the result approves inevitably the accurate quantitative calculation of the stator residual voltage. Then, the analytical derivation of two stages of the power-off process is made respectively in depth based on the symmetrical and asymmetrical vector models of motor. And the analytical expression of the stator residual voltage is obtained. Finally, the stator residual voltage, the voltage difference and the phase- angle difference between the residual voltage and the voltage of the different alternate sources are studied with emphasis. As a result, the optimal power switching strategy and the best switching moment are determined. And the drawed conclusions are verified to be correct and feasible by the test results of the power switching of induction motor.

Key words： Residual voltage voltage difference phase-angle difference the optimal power switching the best switching moment space vector induction motor

Received: 13 May 2014 Published: 14 April 2015

PACS:	TM32
	TM346

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	Cui Xueshen
	Zhang Zili
	Li Heming
	Jia Ying
	Zhang Xiaodong

Cite this article:

Cui Xueshen,Zhang Zili,Li Heming等. Residual Voltage, Voltage Difference and Optimal Switching Strategy During the Power Switching of Induction Motors[J]. Transactions of China Electrotechnical Society, 2015, 30(2): 162-171.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I2/162

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