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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29638

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Stability Analysis of Single Inverter Fed Two Induction Motors in Parallel
This paper discusses the novel graphical approach for stability analysis of multi induction motor drive controlled by a single inverter. Stability issue arises in parallel connected induction motors under unbalanced load conditions. The two powerful globally accepted modeling and simulation software packages such as MATLAB and LabVIEW are selected to perform the stability analysis. The stability investigation is performed for different load conditions and difference in stator and rotor resistances among the two motors. It is very simple and effective than the techniques presented to obtain the stability of the parallel connected induction motor drive under unbalanced load conditions. Approximate transfer functions are considered to model the induction motors, load dynamics, speed controllers and inverter. Simulink library tools are utilized to model the entire drive scheme in MATLAB. Stability study is discussed in LabVIEW using control design and simulation toolkits. Simulation results are illustrated for various running conditions to demonstrate the effectiveness of the transfer function method.
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[1] G K.Matsuse, Y.Kouno, H.Kawai, J.Oikawa, "Characteristics of speed sensor-less vector controlled dual induction motor drive connected in parallel fed by a single Inverter”, IEEE Trans. Ind. Appl., vol. 40, pp. 153-161, Jan./Feb. 2004.
[2] Wang Ruxi, Wang Yue, Dong Qiang He Yanhui and Wang Zhaoan, "Study of control methodology for single inverter parallel connected dual induction motors based on the dynamic model”, IEEE PESC’06, 2006.
[3] B. K. Bose, "Modern Power Electronics and AC Drives”, Upper Saddle River, NJ: pp.348-350, Prentice-Hall, 2001.
[4] Yoshinaga T., Terunuma T. and Matsuse K., "Basic characteristic of parallel connected dual induction motor drives with matrix converter”, In: Proceedings of 34th Annual conference of IEEE Ind. Electronics, 2008, pp.584-589.
[5] Osawa A., Yamazaki M. and Matsuse K., "Vector control method of parallel connected induction motor drives fed by a matrix converter”, In: Proceedings of IEEE IAS meeting, Oct. 2011.
[6] Osawa A., Yamazaki M. and Matsuse K., "Vector control method and driving characteristics of parallel connected induction motor drives fed by a matrix converter”, In: Proceedings of IEEE power engineering conference, 2011.
[7] Masao Yano, Satoru Kuramoti and Hiroyuki Matsuda, "Vector control method of parallel connected induction motors”, Electrical engineering report, pp. 34-39, NR-12, Nov.2001.
[8] H. Kubota, I.Sato, Y. Tamura, K.Matuse, H. Ohta and Y. Hori, "Regenerative mode low speed operation of induction motor drive with adaptive observer”, IEEE Trans. Ind. Appl., vol.38, no.4, pp.1081-1086, July/Aug. 2002.
[9] Lennart Harnefors Marko Hinkkanen, "Complete stability of reducedorder and full-order observers for sensorless IM drives”, IEEE Trans. Ind. Eelectron., vol. 55, no. 3, pp.1319-1329, March 2008.
[10] Hisao Kubota, Kouki Matsuse and Takayoshi Nakano, " DSP-based speed adaptive flux observer of induction motor”, IEEE Trans. Ind. Appl., vol. 29, no. 2, pp.344-348, March/April 1993.
[11] P. Vaclavek and P. Blaha, "Lyapunov function based flux and speed observer for AC induction motor sensorless control and parameter estimation”, IEEE Trans. Ind. Electron., vol. 53, no.1, Feb. 2006.
[12] R. Krishnan, "Electric motor drives modeling, analysis and control”, pp. 492-501, PHI learning private limited, New Delhi, 2001.
[13] R. Gunabalan, V. Subbiah, "Speed sensorless vector control of parallel connected induction motor drive with fuzzy controller”, In: Proceedings of IEEE conference (ICCIC’12), 2012, pp. 473-478.
[14] Lab-view control design user manual, National Instruments, 2008.
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