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Vujacic, M, Dordevic, O, Mandrioli, R and Grandi, G (2021) DC-link low-frequency current and voltage ripple analysis in multiphase voltage source inverters with unbalanced load. IET Electric Power Applications. ISSN 1350-2352
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DC-link low-frequency current and voltage ripple analysis in multiphase voltage source inverters with unbalanced load.pdf - Published Version Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (5MB) | Preview |
Abstract
Inverter’s performance and operating mode may be negatively affected by inverter input (dc-link) current and voltage ripple. It is a common experience that even theoretically balanced loads with perfectly balanced supply voltages, such as multiphase ac motors supplied by PWM inverters, in practice show a certain degree of current unbalance, in the range of a few percent, which introduces a low-frequency instantaneous power oscillation. This reflects in current and voltage low-frequency ripple on the dc-link inverter side (i.e., at the double-fundamental frequency). A possible method to analyze this matter is through the symmetric sequence components. In particular, based on the first negative current sequence component and by considering the equiva-lent dc-link impedance calculated at the dominant double-fundamental frequency, the amplitude of the corresponding dc-link voltage ripple component is calculated in this paper for a general multiphase load. Finally, the design of the dc-link capacitor in multiphase inverters is proposed considering requirements referred to the double-fundamental dc voltage ripple. The feasibility of proposed developments has been verified for three-, five- and seven-phase inverters by both numerical simulations and comprehensive experimental tests, always showing a good matching.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0906 Electrical and Electronic Engineering |
| Subjects: | T Technology > TK Electrical engineering. Electronics. Nuclear engineering |
| Divisions: | Engineering |
| Publisher: | Institution of Engineering and Technology (IET) |
| Date Deposited: | 25 Oct 2021 11:12 |
| Last Modified: | 08 Nov 2021 09:00 |
| DOI or ID number: | 10.1049/elp2.12153 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/15698 |
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