Incremental passivity control in multilevel cascaded H-bridge converters
A low-capacitance static compensator (LC-StatCom) based on a cascaded H-bridge (CHB) multilevel converter can be an efficient and low-cost solution for reactive power compensation in power grids. However, the reduced capacitance, and, therefore, faster capacitor voltage dynamics, makes it challengin...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/139664 |
| _version_ | 1811697329518936064 |
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| author | Rodriguez, Ezequiel Ramos Leyva, Ramon Farivar, Glen Ghias Dehghani Tafti, Hossein Townsend, Christopher David Pou, Josep |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Rodriguez, Ezequiel Ramos Leyva, Ramon Farivar, Glen Ghias Dehghani Tafti, Hossein Townsend, Christopher David Pou, Josep |
| author_sort | Rodriguez, Ezequiel Ramos |
| collection | NTU |
| description | A low-capacitance static compensator (LC-StatCom) based on a cascaded H-bridge (CHB) multilevel converter can be an efficient and low-cost solution for reactive power compensation in power grids. However, the reduced capacitance, and, therefore, faster capacitor voltage dynamics, makes it challenging to control it. Classical cascade control schemes, in which the bandwidths associated with the inner current loop and the outer capacitor voltage loop need to be separated enough, are the most reported approaches. Nevertheless, for the LC-StatCom case, the voltage loop can be almost as fast as that one of the current loop. For this reason, this article proposes a control approach that does not separate voltage and current dynamics. Concretely, we propose a multi-input linear time-variant control law, based on incremental passivity theory for CHB multilevel converters. The proposed control guarantees stability despite saturation in the control signal. In addition, it provides capacitor voltage balance without the need to use a specific balancing stage. This article, first, reviews the average model of the converter and, then, analyses the steady-state dynamic behavior to determine the desired and coherent reference signals. Then, it applies an incremental passivity control approach to drive the LC-StatCom state variables to the desired references. After introducing the proposed control law, experimental results on a seven-level 1-kVA CHB LC-StatCom are shown to demonstrate its excellent performance in steady state and transients. |
| first_indexed | 2024-10-01T07:53:32Z |
| format | Journal Article |
| id | ntu-10356/139664 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:53:32Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1396642021-01-08T01:27:44Z Incremental passivity control in multilevel cascaded H-bridge converters Rodriguez, Ezequiel Ramos Leyva, Ramon Farivar, Glen Ghias Dehghani Tafti, Hossein Townsend, Christopher David Pou, Josep School of Electrical and Electronic Engineering Energy Research Institute @ NTU (ERI@N) Engineering::Electrical and electronic engineering Bilinear System Control Cascaded H-bridge (CHB) A low-capacitance static compensator (LC-StatCom) based on a cascaded H-bridge (CHB) multilevel converter can be an efficient and low-cost solution for reactive power compensation in power grids. However, the reduced capacitance, and, therefore, faster capacitor voltage dynamics, makes it challenging to control it. Classical cascade control schemes, in which the bandwidths associated with the inner current loop and the outer capacitor voltage loop need to be separated enough, are the most reported approaches. Nevertheless, for the LC-StatCom case, the voltage loop can be almost as fast as that one of the current loop. For this reason, this article proposes a control approach that does not separate voltage and current dynamics. Concretely, we propose a multi-input linear time-variant control law, based on incremental passivity theory for CHB multilevel converters. The proposed control guarantees stability despite saturation in the control signal. In addition, it provides capacitor voltage balance without the need to use a specific balancing stage. This article, first, reviews the average model of the converter and, then, analyses the steady-state dynamic behavior to determine the desired and coherent reference signals. Then, it applies an incremental passivity control approach to drive the LC-StatCom state variables to the desired references. After introducing the proposed control law, experimental results on a seven-level 1-kVA CHB LC-StatCom are shown to demonstrate its excellent performance in steady state and transients. MOE (Min. of Education, S’pore) Accepted version 2020-05-21T01:21:58Z 2020-05-21T01:21:58Z 2020 Journal Article Rodriguez, E. R., Leyva, R., Farivar, G. G., Dehghani Tafti, H., Townsend, C. D., & Pou, J. (2020). Incremental passivity control in multilevel cascaded H-bridge converters. IEEE Transactions on Power Electronics, 35(8), 8766-8778. doi:10.1109/TPEL.2020.2965164 0885-8993 https://hdl.handle.net/10356/139664 10.1109/TPEL.2020.2965164 8 35 8766 8778 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.2020.2965164 application/pdf |
| spellingShingle | Engineering::Electrical and electronic engineering Bilinear System Control Cascaded H-bridge (CHB) Rodriguez, Ezequiel Ramos Leyva, Ramon Farivar, Glen Ghias Dehghani Tafti, Hossein Townsend, Christopher David Pou, Josep Incremental passivity control in multilevel cascaded H-bridge converters |
| title | Incremental passivity control in multilevel cascaded H-bridge converters |
| title_full | Incremental passivity control in multilevel cascaded H-bridge converters |
| title_fullStr | Incremental passivity control in multilevel cascaded H-bridge converters |
| title_full_unstemmed | Incremental passivity control in multilevel cascaded H-bridge converters |
| title_short | Incremental passivity control in multilevel cascaded H-bridge converters |
| title_sort | incremental passivity control in multilevel cascaded h bridge converters |
| topic | Engineering::Electrical and electronic engineering Bilinear System Control Cascaded H-bridge (CHB) |
| url | https://hdl.handle.net/10356/139664 |
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