Precharging strategy for soft startup process of modular multilevel converters based on various SM circuits

Jiangchao Qin; Suman Debnath; Maryam Saeedifard

doi:10.1109/APEC.2016.7468070

Precharging strategy for soft startup process of modular multilevel converters based on various SM circuits

Jiangchao Qin, Suman Debnath, Maryam Saeedifard

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

8 Scopus citations

Abstract

The modular multilevel converter (MMC) has become one of the most promising converter technologies for medium/high-power applications, specifically for high-voltage direct current (HVDC) transmission systems. One of the technical challenges associated with the operation and control of the MMC-based system is to precharge the submodule (SM) capacitors to their nominal voltages during the startup process. In this paper, considering various SM circuits, a general precharging strategy is proposed for the MMC-based systems under ac-and dc-side startup conditions. The proposed startup method does not require any additional feedback control loop, extra measurements, and/or auxiliary power supplies. Based on the developed startup method, the charging current is controllable by adjusting the changing rate of the number of blocked and bypassed SM capacitors. Performance of the proposed strategy for various MMCs is evaluated based on time-domain simulation studies in the PSCAD/EMTDC software environment.

Original language	English (US)
Title of host publication	2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1528-1533
Number of pages	6
Volume	2016-May
ISBN (Electronic)	9781467383936
DOIs	https://doi.org/10.1109/APEC.2016.7468070
State	Published - May 10 2016
Event	31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016 - Long Beach, United States Duration: Mar 20 2016 → Mar 24 2016

Other

Other	31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016
Country	United States
City	Long Beach
Period	3/20/16 → 3/24/16

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1109/APEC.2016.7468070

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Qin, J., Debnath, S., & Saeedifard, M. (2016). Precharging strategy for soft startup process of modular multilevel converters based on various SM circuits. In 2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016 (Vol. 2016-May, pp. 1528-1533). [7468070] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2016.7468070

Precharging strategy for soft startup process of modular multilevel converters based on various SM circuits. / Qin, Jiangchao; Debnath, Suman; Saeedifard, Maryam.

2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016. Vol. 2016-May Institute of Electrical and Electronics Engineers Inc., 2016. p. 1528-1533 7468070.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Qin, J, Debnath, S & Saeedifard, M 2016, Precharging strategy for soft startup process of modular multilevel converters based on various SM circuits. in 2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016. vol. 2016-May, 7468070, Institute of Electrical and Electronics Engineers Inc., pp. 1528-1533, 31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016, Long Beach, United States, 3/20/16. https://doi.org/10.1109/APEC.2016.7468070

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abstract = "The modular multilevel converter (MMC) has become one of the most promising converter technologies for medium/high-power applications, specifically for high-voltage direct current (HVDC) transmission systems. One of the technical challenges associated with the operation and control of the MMC-based system is to precharge the submodule (SM) capacitors to their nominal voltages during the startup process. In this paper, considering various SM circuits, a general precharging strategy is proposed for the MMC-based systems under ac-and dc-side startup conditions. The proposed startup method does not require any additional feedback control loop, extra measurements, and/or auxiliary power supplies. Based on the developed startup method, the charging current is controllable by adjusting the changing rate of the number of blocked and bypassed SM capacitors. Performance of the proposed strategy for various MMCs is evaluated based on time-domain simulation studies in the PSCAD/EMTDC software environment.",

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N2 - The modular multilevel converter (MMC) has become one of the most promising converter technologies for medium/high-power applications, specifically for high-voltage direct current (HVDC) transmission systems. One of the technical challenges associated with the operation and control of the MMC-based system is to precharge the submodule (SM) capacitors to their nominal voltages during the startup process. In this paper, considering various SM circuits, a general precharging strategy is proposed for the MMC-based systems under ac-and dc-side startup conditions. The proposed startup method does not require any additional feedback control loop, extra measurements, and/or auxiliary power supplies. Based on the developed startup method, the charging current is controllable by adjusting the changing rate of the number of blocked and bypassed SM capacitors. Performance of the proposed strategy for various MMCs is evaluated based on time-domain simulation studies in the PSCAD/EMTDC software environment.

AB - The modular multilevel converter (MMC) has become one of the most promising converter technologies for medium/high-power applications, specifically for high-voltage direct current (HVDC) transmission systems. One of the technical challenges associated with the operation and control of the MMC-based system is to precharge the submodule (SM) capacitors to their nominal voltages during the startup process. In this paper, considering various SM circuits, a general precharging strategy is proposed for the MMC-based systems under ac-and dc-side startup conditions. The proposed startup method does not require any additional feedback control loop, extra measurements, and/or auxiliary power supplies. Based on the developed startup method, the charging current is controllable by adjusting the changing rate of the number of blocked and bypassed SM capacitors. Performance of the proposed strategy for various MMCs is evaluated based on time-domain simulation studies in the PSCAD/EMTDC software environment.

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Precharging strategy for soft startup process of modular multilevel converters based on various SM circuits

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