Anticipative Sorting Control of Modular Multilevel Converters

Cristian Lascu, Emanuel Serban, Cosmin Pondiche, Tomislav Dragicevic

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

This paper describes a new sorting and modulation strategy for Modular Multilevel Converters (MMC), which has the ability to control the switching frequency of the power devices. In order to control the capacitor voltages of individual submodule (SM), the new scheme uses anticipative inserting and bypassing of the MMC submodules based on the arm or load current levels. The MMC arm currents provide an accurate early indication about the capacitor voltage changes, and allow anticipative control action of voltage gradients. In this way, SMs with large voltages may be switched off in anticipation when subjected to fast voltage transients, avoiding protection trips. To this end, the arm or load current is quantized into several levels and the actual current level defines the number of switching events in real time. Next, the list of SMs is voltage-based sorted and several SMs are switched on or off in anticipation, before their voltage reaches the global limit. In this way, more SMs are switched when the arm current is large, i.e. when voltages change fast. This algorithm tends to group together the SM voltages when the voltage increases, while still maintaining an overall low switching frequency. The paper presents a detailed description of this current level anticipative sorting (CLAS) and analyses its performance with respect to the conventional sort-and-switch algorithm. Experimental results on a low power MMC setup with 24 SMs per phase validate the proposed CLAS algorithm.
Original languageEnglish
Title of host publicationProceedings of the 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
Number of pages8
PublisherIEEE Press
Publication dateSep 2018
Pages678-685
Article number8558135
ISBN (Print)978-1-4799-7311-8
ISBN (Electronic)978-1-4799-7312-5
DOIs
Publication statusPublished - Sep 2018
Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
Duration: 23 Sep 201827 Sep 2018

Conference

Conference10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
CountryUnited States
CityPortland
Period23/09/201827/09/2018
SponsorIEEE Industry Applications Society (IAS), IEEE Power Electronic Society (PELS)
SeriesIEEE Energy Conversion Congress and Exposition
ISSN2329-3721

Fingerprint

Sorting
Electric potential
Switching frequency
Capacitors
Switches
Modulation

Keywords

  • Dc-ac converters
  • Modular converters
  • Multilevel converters
  • Sorting control

Cite this

Lascu, C., Serban, E., Pondiche, C., & Dragicevic, T. (2018). Anticipative Sorting Control of Modular Multilevel Converters. In Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 (pp. 678-685). [8558135] IEEE Press. IEEE Energy Conversion Congress and Exposition https://doi.org/10.1109/ECCE.2018.8558135
Lascu, Cristian ; Serban, Emanuel ; Pondiche, Cosmin ; Dragicevic, Tomislav. / Anticipative Sorting Control of Modular Multilevel Converters. Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018. IEEE Press, 2018. pp. 678-685 (IEEE Energy Conversion Congress and Exposition).
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abstract = "This paper describes a new sorting and modulation strategy for Modular Multilevel Converters (MMC), which has the ability to control the switching frequency of the power devices. In order to control the capacitor voltages of individual submodule (SM), the new scheme uses anticipative inserting and bypassing of the MMC submodules based on the arm or load current levels. The MMC arm currents provide an accurate early indication about the capacitor voltage changes, and allow anticipative control action of voltage gradients. In this way, SMs with large voltages may be switched off in anticipation when subjected to fast voltage transients, avoiding protection trips. To this end, the arm or load current is quantized into several levels and the actual current level defines the number of switching events in real time. Next, the list of SMs is voltage-based sorted and several SMs are switched on or off in anticipation, before their voltage reaches the global limit. In this way, more SMs are switched when the arm current is large, i.e. when voltages change fast. This algorithm tends to group together the SM voltages when the voltage increases, while still maintaining an overall low switching frequency. The paper presents a detailed description of this current level anticipative sorting (CLAS) and analyses its performance with respect to the conventional sort-and-switch algorithm. Experimental results on a low power MMC setup with 24 SMs per phase validate the proposed CLAS algorithm.",
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Lascu, C, Serban, E, Pondiche, C & Dragicevic, T 2018, Anticipative Sorting Control of Modular Multilevel Converters. in Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018., 8558135, IEEE Press, IEEE Energy Conversion Congress and Exposition, pp. 678-685, 10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018, Portland, United States, 23/09/2018. https://doi.org/10.1109/ECCE.2018.8558135

Anticipative Sorting Control of Modular Multilevel Converters. / Lascu, Cristian; Serban, Emanuel; Pondiche, Cosmin; Dragicevic, Tomislav.

Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018. IEEE Press, 2018. p. 678-685 8558135 (IEEE Energy Conversion Congress and Exposition).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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T1 - Anticipative Sorting Control of Modular Multilevel Converters

AU - Lascu, Cristian

AU - Serban, Emanuel

AU - Pondiche, Cosmin

AU - Dragicevic, Tomislav

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N2 - This paper describes a new sorting and modulation strategy for Modular Multilevel Converters (MMC), which has the ability to control the switching frequency of the power devices. In order to control the capacitor voltages of individual submodule (SM), the new scheme uses anticipative inserting and bypassing of the MMC submodules based on the arm or load current levels. The MMC arm currents provide an accurate early indication about the capacitor voltage changes, and allow anticipative control action of voltage gradients. In this way, SMs with large voltages may be switched off in anticipation when subjected to fast voltage transients, avoiding protection trips. To this end, the arm or load current is quantized into several levels and the actual current level defines the number of switching events in real time. Next, the list of SMs is voltage-based sorted and several SMs are switched on or off in anticipation, before their voltage reaches the global limit. In this way, more SMs are switched when the arm current is large, i.e. when voltages change fast. This algorithm tends to group together the SM voltages when the voltage increases, while still maintaining an overall low switching frequency. The paper presents a detailed description of this current level anticipative sorting (CLAS) and analyses its performance with respect to the conventional sort-and-switch algorithm. Experimental results on a low power MMC setup with 24 SMs per phase validate the proposed CLAS algorithm.

AB - This paper describes a new sorting and modulation strategy for Modular Multilevel Converters (MMC), which has the ability to control the switching frequency of the power devices. In order to control the capacitor voltages of individual submodule (SM), the new scheme uses anticipative inserting and bypassing of the MMC submodules based on the arm or load current levels. The MMC arm currents provide an accurate early indication about the capacitor voltage changes, and allow anticipative control action of voltage gradients. In this way, SMs with large voltages may be switched off in anticipation when subjected to fast voltage transients, avoiding protection trips. To this end, the arm or load current is quantized into several levels and the actual current level defines the number of switching events in real time. Next, the list of SMs is voltage-based sorted and several SMs are switched on or off in anticipation, before their voltage reaches the global limit. In this way, more SMs are switched when the arm current is large, i.e. when voltages change fast. This algorithm tends to group together the SM voltages when the voltage increases, while still maintaining an overall low switching frequency. The paper presents a detailed description of this current level anticipative sorting (CLAS) and analyses its performance with respect to the conventional sort-and-switch algorithm. Experimental results on a low power MMC setup with 24 SMs per phase validate the proposed CLAS algorithm.

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DO - 10.1109/ECCE.2018.8558135

M3 - Article in proceeding

SN - 978-1-4799-7311-8

T3 - IEEE Energy Conversion Congress and Exposition

SP - 678

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BT - Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

PB - IEEE Press

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Lascu C, Serban E, Pondiche C, Dragicevic T. Anticipative Sorting Control of Modular Multilevel Converters. In Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018. IEEE Press. 2018. p. 678-685. 8558135. (IEEE Energy Conversion Congress and Exposition). https://doi.org/10.1109/ECCE.2018.8558135