Abstract. The problem of improving precision electric drives quality by minimization of the stator current pulsations generated by frequency inverter is discussed. The problem can be solved by using multi-phase inverters, as well as by improving the control algorithms. The influence of space-vector modula-tion algorithm on pulsations of stator current generated by a five-phase voltage inverter for various se-quences of basic vectors formation is considered. Changing the sequence of base vectors is shown to have a significant effect on the level of generated stator current pulsations. Two possible approaches to implementation of the space-vector modulation in the five-phase electric drives are presented, and com-parative analysis of the approaches with and without considering the dead time, is carried out. Results of modeling are presented, confirming that minimizing the number of commutations per modulation period with deep control of the electric drive speed has a significant impact not only on the level of the stator current pulsations, but also on the compensation of the current vector in the second plane of the base vectors, which can cause overheating and subsequent failure of the electric motor.

Keywords: multiphase electric drive, space-vector modulation, coefficient of variation, precision electric drive, frequency converters

References:

1. Tomasov V.S., Usol'tsev A.A., Vertegel D.A. Journal of Instrument Engineering, 2018, no. 12(61), pp. 1052–1059. (in Russ.)
2. Lovlin S., Abdullin A. 9th International Conference on Power Drives Systems, ICPDS 2016, IET, 2016, pp. 1–5.
3. Tomasov V.S., Usoltsev A.A., Vertegel D.A., Strzelecki R. Journal of Instrument Engineering, 2017, no. 7(60), pp. 624–634.
4. Lega A., Mengoni M., Serra G., Tani A. and Zarri L. IEEE International Symposium on Industrial Electronics, 2008, pp. 237–244.
5. Vukosavic S.N., Jones M., Levi E., Dujic D. 4th IET International Conference on Power Electronics, Machines and Drives, 2008, pp. 686–690.
6. Iqbal A., Levi E. European Conference on Power Electronics and Applications, Dresden, 2005, pp. 12.
7. Levi E., Bojoi R., Profumo F., Toliyat H., Williamson S. IET Electr. Power Appl., 2007, no. 4(1), pp. 489–516.
8. Mengoni M, Zarri L., Tani A., Parsa L., Serra G., Casadei D. IEEE Trans. Ind. Electron., 2015, no. 2(62), pp. 814–825.
9. Kim N., Baik W. 8th International Conference on Power Electronics and ECCE Asia, IEEE, 2011, pp. 2519–2524.
10. Parsa L. IECON Proceedings, 2005, pp. 1574–1579.
11. Levi E. IEEE Trans. Ind. Electron., 2008, no. 5(55), pp. 1893–1909.
12. Iqbal A., Levi E. International Power Electronics and Motion Control, EPE-PEMC, Portoroz, Slovenia, 2006, pp. 222–227.
13. Iqbal A., Moinuddin S., Khan M. IEEE International Conference on Industrial Technology, 2006, pp. 488–493.
14. Silva P., Fletcher J., Williams B. Power Electronics, Machines and Drives – PEMD, 2004, no. 2(2), pp. 650–655.
15. Ryu H., Kim J., Sul S. IEEE Trans. on Power Electronics, 2005, no. 6(20), pp. 1364–1371.
16. Hongwei G., Jianyong S., Guijie Y., Zhao P. International Power Electronics and Motion Control, IPEMC, 2012, pp. 992–996.
17. Duran M., Levi E. Industrial Electronics Conference, IECON-2006, pp. 2103–2108.
18. Duran M., Toral S., Barrero F., Levi E. Industrial Electronics Conference, IECON-2007, pp. 1518–1523.
19. Gataric S. IEEE Industry Applications Conference – IAS, 2000, vol. 3, pp. 1648–1654.