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.
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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|Item Type:||Conference Paper|
|Keywords:||Cascaded multilevel inverter, Non-integer voltage ratio, Supercapacitor direct integration, Wind energy|
|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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