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Analysis of a doubly fed induction motor in electric drives of pumping stations

The investigation of a doubly fed induction motor in electric drives of pumping stations is conducted in this paper. The effect of non-sinusoidal rotor supply is considered in the analysis as well. The current total harmonic distortion (THD) is evaluated with respect to the selected voltage modulation in a thyristor frequency converter (TFC) as well as on motor duty cycle. A novel method of reactive power regulation with constant rotor current I2=I2 =constant is proposed. It is shown that the proposed method considerably improves motor performance in the whole operation range. The proposed analytical method is verified with laboratory measurements. © 2015 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the organizing committee of the International Conference on Industrial Engineering (ICIE2015).