© The Institution of Engineering and Technology
The fluctuation of neutral-point potential (NPP) is an internal problem of three-level inverter. The fluctuation of NPP is investigated when the inverter, eight-switch three-phase inverter is working in fault tolerant mode. It is proved that the NPP fluctuation will cause output unbalance if the inverter is still controlled by the conventional space vector pulse-width modulation (SVPWM) strategy. Thus, a novel SVPWM considering NPP fluctuation is proposed to suppress the output unbalance. The effectiveness of the proposed method is demonstrated by the experimental results.
References
-
-
1)
-
17. Lewicki, A., Krzeminski, Z., Abu-Rub, H.: ‘Space-vector pulsewidth modulation for three-level NPC converter with the neutral point voltage control’, IEEE Trans. Ind. Electron., 2011, 58, (11), pp. 5076–5086 (doi: 10.1109/TIE.2011.2119453).
-
2)
-
4. Santu, K.G., Sibaprasad, C., Subrata, B., Chandan, C.: ‘A carrier-based PWM scheme for neutral point voltage balancing in three-level inverter extending to full power factor range’, IEEE Trans. Ind. Electron., 2017, 64, (3), pp. 1873–1883 (doi: 10.1109/TIE.2016.2624721).
-
3)
-
25. Celanovic, N., Boroyevich, D.: ‘A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters’, IEEE Trans. Power Electron., 2000, 15, pp. 242–249 (doi: 10.1109/63.838096).
-
4)
-
3. Abhijt, C., Pragasen, P., Sheldon, S.W.: ‘DC-bus voltage balancing algorithm for three-level neutral-point-clamped (NPC) traction inverter drive with modified virtual space vector’, IEEE Trans. Ind. Appl., 2016, 52, (5), pp. 3958–3967 (doi: 10.1109/TIA.2016.2566600).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.1333
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content/journals/10.1049/el.2017.1333
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Suppression strategy for output unbalance of eight-switch three-phase inverter