Analysis of Vector Estimating Modulation Method to Eliminate Common Mode Voltage

Document Type : Research Article

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Abstract

Abstract
The problem of common mode voltage in inverters can be considered as a major issue which leads to motor bearing failures. To eliminate these voltages, proposing some methods seems to be necessary. This paper has a comparative study on estimating modulation methods of eliminating common mode voltage. The main idea of these methods is based on generation of reference vector with nearest vector/ vectors with zero common mode voltage. Depending on the number of delivering nearest vectors, there are two estimating methods. For the reference method, reference vector is synthesized only by the nearest vector. But for the proposed method, the reference vector is synthesized by more than one vector. Dwell time calculations of these vectors are based on the distance between the afore-mentioned vectors and the reference vector. In this paper, some characteristics such as linear relationships among output voltage and modulation index, and also total harmonic distortion of output voltage and stator current are considered. Finally, it is concluded that the new method has more advantages such as more linear relationships and lower THD of current with respect to the reference method.

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References

Periodicals:
[1]     Jose Rodriguez, Jorge Pontt, Pablo Correa, Patricio Cortes, Cesar Silva, “A New Modulation Method to Reduce Common-Mode Voltages in Multilevel Inverters”, IEEE TRANSACTIONS ON INDUSTRY ELECTRONICS, VOL.51, NO.4, AUGUST 2004.
[2]     Shaotang Chen, Thomas A.lipo, Dennis Fitzgerald, “Modeling of Motor Bearing Currents in PWM Inverter Drives”,IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 32, NO. 6, NOVEMBER/ DECEMBER 1996.
[3]     A.  Muetze and A. Binder, “Don’t lose your bearings—Mitigation techniques for bearing currents in inverter-supplied drive systems,” IEEE Ind. Appl. Mag., VOL. 12, NO. 4, JULY/AUGUST 2006.
[4]     Haoran Zhang, Annette von Jouanne, Shaoan Dai, Alan K.Wallace, Fei Wang, “Multilevel Inverter Modulation Schemes to Eliminate Common‐Mode Voltages”, IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 36, NO. 6, NOVEMBER /DECEMBER 2000.
[5]     Wenix Yao, Haibing Hu, Zhengyu Lu, “ Comparsions of Spacevector Modulation and Carrier-Based Modulation of Multilevel Inverter”, IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 1, JANURAY 2008. 
[6]     Nasim Rashidirad, Abdolreza Rahmati, Adib Abrishamifar, “Comparison of Reliability in Modular Multilevel Inverters”, Electrical Review journal (PRZEGLAD ELEKTROTECHNICZNY), ISSN: 0033-2097, 2012
[7]     Nasim Rashidirad, Abdolreza Rahmati, Adib Abrishamifar, “A Novel Scheme to Eliminate Common Mode Voltage in Multilevel Inverters”, International Journal of Scientific and Engineering Research, Jun 2011.
Papers from Conference Proceedings (Published):
[8]     N. Rashidi‐rad, A. Rahmati and A. Abrishamifar, “A New Modulation Method to Eliminate Common Mode Voltages in Modular Multilevel Inverters”, in Proc.  2011 IEEE International Conference on Information and Industrial Electronics, pp. 113-116.
Dissertations:
[9]     Maryam Saeedifard, “Space Vector Modulation of Multi-Level and Multi-Module Converters for High Power Applications”, Ph.D. dissertation, Dept. Elec. Eng., Univ. Toronto, 2008.
AUT Journal of Modeling and Simulation
Volume 44, Issue 2 - Serial Number 2
November 2012
Pages 47-53

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