access icon free Improved modulation method with reduced switching frequency for OW-PMSM system with common DC bus

© The Institution of Engineering and Technology
Received 09/04/2019, Published 17/07/2019

To reduce the switching frequency of open-winding permanent magnet synchronous motor (OW-PMSM) system with a common DC bus, this Letter proposes a novel modulation method. In this method, the independent modulation is implemented in each phase to generate the reference voltages in the abc reference frame, where only one bridge arm has switching actions. Compared with the existing modulation methods for OW-PMSM system, the total switching actions within one PWM period can be remarkably reduced to 6 with the control target of the zero-sequence current suppression achieved, and the modulation range can be kept unchanged. The experimental results validate the availability of the proposed modulation method for OW-PMSM system.

Inspec keywords: machine control; torque control; machine windings; permanent magnet motors; PWM invertors; synchronous motors

Other keywords: common DC bus; independent modulation; permanent magnet synchronous motor system; novel modulation method; OW-PMSM system; modulation range; improved modulation method; existing modulation methods; reduced switching frequency; abc reference frame

Subjects: Control of electric power systems; Synchronous machines; Mechanical variables control; Power convertors and power supplies to apparatus

References

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      • 2. Zhou, Y., Nian, H.: ‘Zero-sequence current suppression strategy of open-winding PMSG system with common DC bus based on zero vector redistribution’, Trans. Ind. Electron., 2015, 62, (6), pp. 3399–3408, doi: 10.1109/TIE.2014.2366715.
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      • 4. Balamurali, A., Feng, G., Lai, C., et al: ‘Investigation into variation of permanent magnet synchronous motor-drive losses for system level efficiency improvement’. IECON 2017 – 43rd Annual Conf. IEEE Industrial Electronics Society, Beijing, China, 29 October–1 November 2017, pp. 2014–2019, doi: 10.1109/IECON.2017.8216339.
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      • 1. Zhan, H., Zhu, Z., Odavic, M.: ‘Analysis and suppression of zero sequence circulating current in open winding PMSM drives with common DC bus’, Trans. Ind. Electron., 2017, 53, (4), pp. 3609–3620, doi: 10.1109/TIA.2017.2679678.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2019.1070
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