Direct Torque Control in a Flying Capacitor Inverter with Reduction of Common Mode Voltage
Subject Areas : electrical and computer engineering
Mohammad
Arasteh
1
(University of Science & Culture)
2
(University of Science and Technology)
S.
Farhangi
3
(University of Tehran)
S. A.
Abrishamifar
4
(University of Science and Technology)
Keywords: Bearing current common mode voltage direct torque control flying capacitor inverter multilevel drive,
Abstract :
Bearing current in inverter-fed induction motors can result in premature bearing failure. This paper gives a detailed analysis of common mode voltage as the main source of bearing currents. Moreover, it presents an algorithm to reduce the common mode voltage in multilevel DTC drive. Based on the given analysis, the common mode voltage is reduced to about 33 percent of the initial value. The simulation results in MATLAB/SIMULINK confirm the capability of the algorithm in common mode voltage reduction without degrading the electromagnetic torque and the speed response. The results of real world experiments using TMS320F2812 DSP processor are also provided.
[1] J. Rodríguez, S. Bernet, B. Wu, J. O. Pontt, and S. Kouro, "Multilevel voltage-source-converter topologies for industrial medium-voltage drives," IEEE Trans. on Ind. Electron., vol. 54, no. 6, pp. 2930-2945, Dec. 2007.
[2] S. S. Fazel, S. Bernet, D. Krug, and K. Jalili, "Design and comparison of 4-kV neutral-point-clamped, flying-capacitor, and series-connected H-bridge multilevel converters," IEEE Trans. Ind. Applicat, vol. 43, no. 4, pp. 1032-1040, Jul./Aug. 2007.
[3] D. Krug, S. Bernet, S. S. Fazel, K. Jalili, and M. Malinowsk, "Comparison of 2.3-kV medium-voltage multilevel converters for industrial medium-voltage drives," IEEE Trans. Ind. Electron., vol. 54, no. 6, pp. 2979-2992, Dec. 2007.
[4] J. Rodríguez, J. Pontt, S. Kouro, and P. Correa, "Direct torque control with imposed switching frequency in an 11-level cascaded inverter," IEEE Trans. Industrial Electronics, vol. 51, no. 4, pp. 827-833, Aug. 2004.
[5] M. F. Escalante, J. C. Vannier, and A. Arzande, "Flying capacitor multilevel inverters and DTC motor drive applications," IEEE Trans. on Ind. Electron., vol. 49, no. 4, pp. 809-815, Aug. 2002.
[6] N. R. N. Idris and A. H. M. Yatim, "Direct torque control of induction machines with constant switching frequency and reduced torque ripple," IEEE Trans. on Ind. Electron., vol. 51, no. 4, pp. 758-767, Aug. 2004.
[7] N. R. N. Idris, C. L. Toh, and M. E. Elbuluk, "A new torque and flux controller for direct torque control of induction machines," IEEE Trans. Ind. Applicat., vol. 42, no. 6, pp. 1358-1366, Nov./Dec. 2006.
[8] S. Chen, T. A. Lipo, and D. Fitzgerald, "Modelling of bearing currents in inverter drives," IEEE Trans. Ind. Applicat., vol. 32, no. 1, pp. 21-32, Jan./Feb. 1996.
[9] J. Erdman, R. Kerkman, and D. Schlegel, "Effect of PWM inverters on AC motor bearing currents and shaft voltages," IEEE Trans. Ind. Applicat., vol. 32, no. 2, pp. 250-259, Mar./Apr. 1996.
[10] A. V. Jouanne, H. Zhang, and A. K. Wallace, "An evaluation of mitigation techniques for bearing currents, EMI and overvoltages in ASD applications," IEEE Trans. Ind. Applicat., vol. 34, no. 5, pp. 1113-1122, Sep./Oct. 1998.
[11] D. Busse, J. M. Erdman, R. J. Kerkman, D. W. Schlegel, and G. L. Skibinski, "An evaluation of the electrostatic shielded induction motor: a solution for rotor shaft voltage buildup and bearing current," IEEE Trans. Ind. Applicat., vol. 33, no. 6, pp. 1563-1570, Nov./Dec. 1997.
[12] X. Chen, D. Xu, F. Liu, and J. Zhang, "A novel inverter - output passive filter for reducing both differential- and common-mode dv/dt at the motor terminals in PWM drive systems," IEEE Trans. on Ind. Electron., vol. 54, no. 1, pp. 419-426, Feb. 2007.
[13] N. Hanigovszki, J. Poulsen, and F. Blaabjerg, "A novel output filter topology to reduce motor overvoltage," IEEE Trans. Ind. Applicat., vol. 40, no. 3, pp. 845-852, May/Jun. 2004.
[14] H. Akagi and S. Tamura, "A passive EMI filter for eliminating both bearing current and ground leakage current from an inverter-driven motor," IEEE Trans. Power Electron., vol. 21, no. 5, pp. 1459-1469, Sep. 2006.
[15] D. Hyypio, "Mitigation of bearing electro-erosion of inverter-fed motors through passive common-mode voltage suppression," IEEE Trans. Ind. Applicat., vol. 41, no. 2, pp. 576-583, Mar./Apr. 2005.
[16] C. Mei, J. C. Balda, and W. P. Waite, "Cancellation of common-mode voltages for induction motor drives using active method," IEEE Trans. Energy Convers., vol. 21, no. 2, pp. 380-386, Jun. 2006.
[17] F. Wang, "Motor shaft voltages and bearing currents and their reduction in multilevel medium - voltage PWM voltage - source - inverter drive applications," IEEE Trans. Ind. Applicat., vol. 36, no. 5, pp. 1336-1341, Sep./Oct. 2000.
[18] H. Zhang, Von Jouanne, S. Dai, A. K. Wallace, and F. Wang, "Multilevel inverter modulation schemes to eliminate common-mode voltages," IEEE Trans. Ind. Applicat., vol. 36, no. 6, pp. 1645-1653, Nov./Dec. 2000.