Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters
This article proposes a closed-loop analytic filtering scheme for the low-frequency capacitor voltage ripple in cascaded H-bridge converters. Although this technique can be applied to a number of cascaded converter applications, this article focuses particularly on the low-capacitance cascaded H-bri...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/139667 |
| _version_ | 1811684124133425152 |
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| author | Rodriguez, Ezequiel Ramos Farivar, Glen Ghias Beniwal, Neha Townsend, Christopher David Dehghani Tafti, Hossein Vazquez, Sergio Pou, Josep |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Rodriguez, Ezequiel Ramos Farivar, Glen Ghias Beniwal, Neha Townsend, Christopher David Dehghani Tafti, Hossein Vazquez, Sergio Pou, Josep |
| author_sort | Rodriguez, Ezequiel Ramos |
| collection | NTU |
| description | This article proposes a closed-loop analytic filtering scheme for the low-frequency capacitor voltage ripple in cascaded H-bridge converters. Although this technique can be applied to a number of cascaded converter applications, this article focuses particularly on the low-capacitance cascaded H-bridge static compensator. Filtering of capacitor voltage signals is particularly important in this application, due to the presence of large low-frequency harmonic voltage ripple. The main novelty of the proposed algorithm in this article is the estimation of the capacitance value of each H-bridge. The closed-loop capacitance estimation method reduces steady-state error in estimated voltage ripple magnitude and phase, which is otherwise present in the available open-loop filters in the literature. Furthermore, fast dynamic response is achieved compared to filtering schemes based on low-pass and bandstop filters. Therefore, the proposed solution optimizes the tradeoff between filtering accuracy and transient response. It also mitigates parametric uncertainties, time delays, and harmonic contamination in the outer voltage control loop. Furthermore, the estimated capacitance is also useful to track the state of health of the dc-link capacitors. Experimental results on a seven-level 1-kVA cascaded H-bridge prototype are presented to demonstrate the comparative performance of the proposed filtering scheme and traditional approaches. |
| first_indexed | 2024-10-01T04:23:38Z |
| format | Journal Article |
| id | ntu-10356/139667 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:23:38Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1396672021-01-07T03:12:55Z Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters Rodriguez, Ezequiel Ramos Farivar, Glen Ghias Beniwal, Neha Townsend, Christopher David Dehghani Tafti, Hossein Vazquez, Sergio Pou, Josep School of Electrical and Electronic Engineering Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU (ERI@N) Engineering::Electrical and electronic engineering Capacitance Estimation Capacitor Voltage Filtering This article proposes a closed-loop analytic filtering scheme for the low-frequency capacitor voltage ripple in cascaded H-bridge converters. Although this technique can be applied to a number of cascaded converter applications, this article focuses particularly on the low-capacitance cascaded H-bridge static compensator. Filtering of capacitor voltage signals is particularly important in this application, due to the presence of large low-frequency harmonic voltage ripple. The main novelty of the proposed algorithm in this article is the estimation of the capacitance value of each H-bridge. The closed-loop capacitance estimation method reduces steady-state error in estimated voltage ripple magnitude and phase, which is otherwise present in the available open-loop filters in the literature. Furthermore, fast dynamic response is achieved compared to filtering schemes based on low-pass and bandstop filters. Therefore, the proposed solution optimizes the tradeoff between filtering accuracy and transient response. It also mitigates parametric uncertainties, time delays, and harmonic contamination in the outer voltage control loop. Furthermore, the estimated capacitance is also useful to track the state of health of the dc-link capacitors. Experimental results on a seven-level 1-kVA cascaded H-bridge prototype are presented to demonstrate the comparative performance of the proposed filtering scheme and traditional approaches. MOE (Min. of Education, S’pore) Accepted version 2020-05-21T01:33:38Z 2020-05-21T01:33:38Z 2020 Journal Article Rodriguez, E., Farivar, G. G., Beniwal, N., Townsend, C. D., Dehghani Tafti, H., Vazquez, S., & Pou, J. (2020). Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters. IEEE Transactions on Power Electronics, 35(8), 8819-8832. doi:10.1109/TPEL.2020.2966305 0885-8993 https://hdl.handle.net/10356/139667 10.1109/TPEL.2020.2966305 8 35 8819 8832 en IEEE Transactions on Power Electronics © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: https://doi.org/10.1109/TPEL.2020.2966305 application/pdf |
| spellingShingle | Engineering::Electrical and electronic engineering Capacitance Estimation Capacitor Voltage Filtering Rodriguez, Ezequiel Ramos Farivar, Glen Ghias Beniwal, Neha Townsend, Christopher David Dehghani Tafti, Hossein Vazquez, Sergio Pou, Josep Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters |
| title | Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters |
| title_full | Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters |
| title_fullStr | Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters |
| title_full_unstemmed | Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters |
| title_short | Closed-loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded H-bridge converters |
| title_sort | closed loop analytic filtering scheme of capacitor voltage ripple in multilevel cascaded h bridge converters |
| topic | Engineering::Electrical and electronic engineering Capacitance Estimation Capacitor Voltage Filtering |
| url | https://hdl.handle.net/10356/139667 |
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