Pulse width modulation (PWM) converters generate switching common-mode voltages (CMV) across the load terminals. These voltages cause common mode currents, leading to bearing failure in motor loads and electromagnetic interference problems. This study proposes a novel space vector PWM strategy to reduce the CMV in the dual three-phase permanent magnet synchronous motor (PMSM) driven by two-level six-phase inverter. The novel space vector PWM algorithm discards the use of zero vectors. Firstly, the two largest voltage vectors of each sector are selected as main vectors to synthesise reference vector. Then, three groups voltage vector, which are opposite to the main vectors, have been selected as auxiliary vectors. Appropriate auxiliary vector selected is based on the length of zero voltage vector working time. Next, zero vector working time is distributed to the main and selected auxiliary vectors based on voltage-second principle. In addition, CMV and the harmonic component in z1z2 subspace of the proposed space vector PWM are analysed in detail. Finally, the expected CMV reduction to one-sixth of DC voltage and change rate of CMV in each cycle promised by the proposed novel space vector PWM are demonstrated with simulation and experimental results.

References

1. 1)
  - 16. Lopez, O., Alvarez, J., Malvar, J.: etc: ‘Space-vector PWM with common-mode voltage elimination for multiphase drives’, IEEE Trans. Power Electron., 2016, 31, (12), pp. 8151–8161. DOI: 10.1109/TPEL. 2016.2521330.
2. 2)
  - 14. Duran, J., Prieto, J., Barrero, F.: ‘Space vector PWM with reduced common-mode voltage for five-phase induction motor drives operating in overmodulation zone’, IEEE Trans. Ind. Electron., 2013, 8, (8), pp. 4159–4168. DOI: 10, 10.1109/TPEL.2012.2229394.
3. 3)
  - 4. Lu, H., Li, J., Qu, R., et al: ‘Fault-tolerant predictive current control with two-vector modulation for six-phase permanent magnet synchronous machine drives’, IET Electr. Power Appl., 2018, 12, (2), pp. 169–178. DOI: 10.1049/iet-epa.2017.0331.
4. 4)
  - 12. Lai, Y.-S., Chen, P.-S., Lee, H.-K.: ‘Optimal common-mode voltage reduction PWM technique for inverter control with consideration of the dead-time effects-part II: applications to IM drives with diode front end’, IEEE Trans. Ind. Appl., 2004, 40, (6), pp. 1605–1612. DOI: 10.1109/TIA. 2004.836151.
5. 5)
  - 7. Bakhshai, A.R., Joos, G., Jin, H.: ‘Space vector PWM control of a split-phase induction machine using the vector classification technique.’ Proc. Appl. Power Electron. Conf., Anaheim, CA, USA, February 15–19 1998, vol. 2, pp. 802–808. DOI: 10.1109/APEC.1998.653990.
6. 6)
  - 5. Ren, Y., Zhu, Z.Q.: ‘Reduction of both harmonic current and torque ripple for dual three-phase permanent-magnet synchronous machine using modified switching-table-based direct torque control’, IEEE Trans. Ind. Electron., 2015, 11, pp. 6671–6683. DOI: 10.1109/TIE. 2015. 2448511.
7. 7)
  - 6. Ren, Y., Zhu, Z.Q.: ‘Enhancement of steady-state performance indirect torque controlled dual three phase permanent magnet synchronous machine drives with modified switching table’, IEEE Trans. Ind. Electron., 2015, 6, pp. 3338–3350. DOI: 10.1109/TIE.2014.2376881.
8. 8)
  - 2. Melo, V.F.M.B., Jacobina, C.B., Rocha, N.: ‘Fault tolerance performance of dual-inverter-based six-phase drive system under single-, two-, and three-phase open-circuit fault operation’, IET Power Electron., 2018, 11, (1), pp. 212–220. DOI: 10.1049/iet-pel.2016.0724.
9. 9)
  - 11. Hava, A.M., Un, E.: ‘Performance analysis of reduced common-mode voltage PWM methods and comparison with standard PWM methods for three-phase voltage-source inverters’, IEEE Trans. Power Electron., 2009, 24, (1), pp. 241–252. DOI: 10.1109/TPEL.2008.2005719.
10. 10)
  - 17. Chen, K.-Y.: ‘Generalized minimum common-mode voltage PWM for two-level multiphase VSIs considering reference order’, IEEE Trans. Power Electron., 2016, 32, (8), pp. 6493–6509. DOI: 10.1109/TPEL. 2016. 2615111.
11. 11)
  - 13. Tallam, R.M., Kerkman, R.J., Leggate, D., et al: ‘Common-mode voltage reduction PWM algorithm for AC drives’, IEEE Trans. Ind. Appl., 2010, 46, (5), pp. 1959–1969. DOI: 10.1109/ ECCE.2009.5316381.
12. 12)
  - 1. Liu, Z., Zheng, Z., Wang, Q., et al: ‘Enhanced rotor field-oriented control of multiphase induction machines based on symmetrical components theory’, IET Power Electron., 2019, 12, (4), pp. 656–666. DOI: 10.1049/iet-pel.2018.5710.
13. 13)
  - 9. Zhou, C., Yang, G.: ‘PWM strategy with minimum harmonic distortion for dual three-phase permanent-magnet synchronous motor drives operating in the overmodulation region’, IEEE Trans. Power Electron., 2016, 2, pp. 1367–1380. DOI: 10.1109/TPEL.2015.2414437.
14. 14)
  - 10. Erdman, J.M., Kerkman, R.J., Schlegel, D.W., et al: ‘Effect of PWM inverters on AC motor bearing currents and shaft voltages’, IEEE Trans. Ind. Appl., 1996, 32, (2), pp. 250–259. DOI: 10.1109/28.491472.
15. 15)
  - 8. Yazdani, D., Khajehoddin, S.A., Bakhshai, A., et al: ‘Full utilization of the inverter in split-phase drives by means of a dual three-phase space vector classification algorithm’, IEEE Trans. Ind. Electron., 2009, 56, (1), pp. 120–128. DOI: 10.1109/TIE. 2008. 927405.
16. 16)
  - 15. Duran, M.J., Prieto, J., Barrero, F.: ‘Space vector PWM with reduced common-mode voltage for five-phase induction motor drives operating in over-modulation zone’, IEEE Trans. Power Electron., 2013, 28, (8), pp. 4030–4040.
17. 17)
  - 18. Pulvirenti, M., Scarcella, G., Scelba, G.: ‘Space vector modulation technique for common mode currents reduction in six phase AC drives’. European Conf. on Power Electronics & ApplicationsLille, France, October 2013, pp. 1–10. DOI: 10.1109/EPE. 2013.6634729.
18. 18)
  - 3. Levi, E.: ‘Advances in converter control and innovative exploitation of additional degrees of freedom for multiphase machines’, IEEE Trans. Ind. Electron., 2016, 63, (1), pp. 433–448. DOI: 10.1109/ TIE.2015.2434999.

Novel space vector PWM technology with lower common-mode voltage for dual three-phase PMSM

References

Related content