JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (6): 70-76.doi: 10.6040/j.issn.1672-3961.0.2017.383

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Soft-start control strategy of induction motor based on space voltage vector

ZHANG Weijiang1,2, DANG Hongshe1*   

  1. 1. School of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China;
    2. School of Electrical Engineering, Tibet Agriculture and Animal Husbandry College, Linzhi 860000, Tibet, China
  • Received:2017-08-03 Online:2017-12-20 Published:2017-08-03

Abstract: According to the theory of space voltage vector and its control idea, a control strategy which could improve the starting torque of induction motor was proposed based on the thyristor soft starter-induction motor system. By achieving the three-phase stator voltage in the thyristors controlled voltage space vector transform, an effective control of the rotor flux and electromagnetic torque was formed. The structure of the main circuit of the traditional soft starter was kept unchanged in this strategy, in order to determine the initial trigger angle easily and quickly. The Laplace transform of stator current under the effect of vector voltage was solved and analyzed by building up the mathematical model of order reduction based on αβ0 coordinate. To achieve the aim that induction motor acceleration could start smoothly, space voltage vector and zero voltage vector control had been achieved by means of controlling the trigger angle of the silcon controlled rectifier(SCR). The control strategy could improve the induction motor starting electromagnetic torque and effectively reduce the starting current significantly, and the results were validated by simulation and system experiment.

Key words: induction motor, soft start, rotor flux, control strategy, space voltage vector, electromagnetic torque

CLC Number: 

  • TM301.X
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