A hybrid cascaded multilevel inverter with supercapacitor direct integration for wind power systems

Jayasinghe, S.D. Gamini, Vilathgamuwa, D. Mahinda, & Madawala, Udaya K. (2011) A hybrid cascaded multilevel inverter with supercapacitor direct integration for wind power systems. In Proceedings of the 2011 IEEE 8th International Conference on Power Electronics and ECCE Asia (ICPE & ECCE), IEEE, Jeju, Korea, pp. 638-645.

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This paper presents a grid-side inverter based supercapacitor direct integration scheme for wind power systems. The inverter used in this study consists of a conventional two-level inverter and three H-bridge modules. Three supercapacitor banks are directly connected to the dc-links of H-bridge modules. This approach eliminates the need for interfacing dc-dc converters and thus considerably improves the overall efficiency. However, for the maximum utilization of super capacitors their voltages should be allowed to vary. As a result of this variable voltage space vectors of the hybrid inverter get distributed unevenly. To handle this issue, a modified PWM method and a space vector modulation method are proposed and they can generate undistorted current even in the presence of unevenly distributed space vectors. A supercapacitor voltage balancing method is also presented in this paper. Simulation results are presented to validate the efficacy of the proposed scheme, modulation methods and control techniques.

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ID Code: 75073
Item Type: Conference Paper
Refereed: Yes
Keywords: Cascaded multilevel inverter, Non-integer voltage ratio, Supercapacitor direct integration, Wind energy
DOI: 10.1109/ICPE.2011.5944629
ISBN: 9781612849584
ISSN: 2150-6078
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 IEEE
Deposited On: 15 Aug 2014 05:18
Last Modified: 21 Aug 2014 02:19

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