Abstract

This study proposes a novel Direct Torque Control (DTC) method for the Direct Three level Matrix Converter (DTMC), which uses both the input phase voltage vectors (short vectors) and the input line voltage vectors (long vectors). The problem of voltage imbalance at the input filter capacitance due to the use of the short vectors is addressed with an additional voltage hysteresis comparator. With the errors of torque, flux, sin Ψ and the neutral point voltage, an Optimum Switching Table (OST) is designed for the DTMC. The OST generates the necessary switching signals for the DTC of the DTMC. The DTMC topology with the modified ISVM technique reduces the THD at the output. The proposed DTMC Indirect Space Vector pulse width Modulation (ISVM) technique uses the idea of multilevel inverter SVM technique along with the proposed neutral current balancing strategy for generating the firing pulses. The switching loss model for the DTMC is developed and the performance of the DTMC is compared with that of the Conventional Matrix Converter (CMC). The performance of the proposed DTC technique for the DTMC is evaluated through simulation to explain the reduced torque ripple characteristics. To validate the proposed DTMC ISVM technique, a 3 kVA direct multilevel matrix converter prototype was developed.

Keywords:

Conventional matrix converter, direct three level matrix converter, direct torque control, indirect space vector pulse width modulation,

References

1. Aneesh, M.A.S., A. Gopinath and M.R. Baiju, 2009. A simple space vector pwm generation scheme for any general n-level inverter. IEEE T. Ind. Electr., 56(5): 1649-1656.
   CrossRef    
2. Apap, M., J.C. Clare, P.W. Wheeler and K.J. Bradley, 2003. Analysis and comparison of ac-ac matrix converter control strategies. Proceedings of the 34th IEEE Power Electronics Specialists Conference. Acapulco, Mexico, 3: 1287-1292.
   CrossRef    
3. Bierhoff, M.H. and F.W. Fuchs, 2004. Semiconductor losses in voltage and current source IGBT converters based on analytical derivation. Proceedings of the 32nd IEEE Power Electronics Specialist Conference. Aachen, Germany, pp: 2836-2842.
   CrossRef    
4. Boost, M.A. and P.D. Ziogas, 1988. State of the art PWM techniques: A critical evaluation. IEEE T. Ind. Appl., 24(2): 271-280.
   CrossRef    
5. Busquets-Monge, S., J. Bordonau, D. Boroyevich and S. Somavilla, 2004. The nearest three virtual space vector pwm: A modulation for the comprehensive neutral-point balancing in the three-level npc inverter. IEEE Power Electron. Lett., 2(1): 11-15.
   CrossRef    
6. Celanovic, N. and D. Boroyevich, 2000. A comprehensive study of neutral point voltage balancing problem in three-level neutral point clamped voltage source pwm inverters. IEEE T. Power Electr., 15(2): 242-249.
   CrossRef    
7. Erickson, R.W. and O.A. Al-Naseem, 2001. A new family of matrix converters. Proceedings of the 27th IEEE Industrial Electronic Conference. Denver, USA, 2: 1515-1520.
   CrossRef    
8. Erickson, R.W., S. Angkititrakul and K. Almazeedi, 2006. A new family of multilevel matrix converters for wind power applications. Final Report to NREL (National Renewable Energy Laboratory), University of Colorado Boulder, Colorado.
   
9. Fa-Hai, L., L. Yao-Hua, W. Xiang-Heng and G. Jing-De, 1994. Modelling and simulation of synchronous motor fed by cycloconverter. Proceedings of the 25th IEEE Power Electronics Specialists Conference. Taipei, Taiwan, 2: 830-834.
   CrossRef    
10. Huber, L. and D. Borojevic, 1989. Space vector modulator for forced commutated cycloconverters. Proceedings of the 24th IEEE Industry Applications Conference. California, USA, 1: 871-876.
    CrossRef    
11. Lopez, O., J. Alvarez, J.D. Gandoy and F.D. Freijedo, 2008. Multilevel multiphase space vector pwm algorithm. IEEE T. Ind. Electr., 55(5): 1933-1942.
    CrossRef    
12. Meng, Y.L., P. Wheeler and C. Klumpner, 2010. Space-vector modulated multilevel matrix converter. IEEE T. Ind. Electr., 57(10): 3385-3394.
    CrossRef    
13. Nielsen, P., F. Blaabjerg and J.K. Pedersen, 1996. Space vector modulated matrix converter with minimized number of switchings and a feed forward compensation of input voltage unbalance. Proceedings of the IEEE Power Electronics, Drives and Energy Systems for Industrial Growth Conference. New Delhi, India, 2: 833-839.
    
14. Rashid, M.H., 2005. Power Electronics: Circuits, Devices and Applications. Prentice Hall, India.
    
15. Wang, B. and G. Venkataramanan, 2006. Analytical modeling of semiconductor losses in matrix converters. Proceedings of the 5th IEEE Power Electronics and Motion Control Conference. Shanghai, China, 1: 1-8.
    CrossRef    

Competing interests

The authors have no competing interests.

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