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Capacitor selection for modular multilevel converter

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Tang, Yuan, Ran, Li, Alatise, Olayiwola M. and Mawby, P. A. (Philip A.) (2014) Capacitor selection for modular multilevel converter. In: Energy Conversion Congress and Exposition (ECCE), 2014 IEEE, Pittsburgh, PA, 14-18 Sep 2014. Published in: 2014 IEEE Energy Conversion Congress and Exposition (ECCE) pp. 2080-2087. doi:10.1109/ECCE.2014.6953677

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Official URL: http://dx.doi.org/10.1109/ECCE.2014.6953677

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Abstract

A reliable method to select capacitors for a modular multilevel converter (MMC) is proposed in this paper. Based on the ageing mechanisms of the metallized polypropylene film (MPPF) capacitor and operational characteristics of MMC, four requirements, i.e. the maximum capacitor voltage, voltage ripple, ripple current and submodule voltage capability are considered in a procedure for capacitor selection. The effects of 2nd order harmonic circulating current suppression control and the arm inductors are taken into account. The ripple current stress is found to be less than 126mA/μF for 2kV submodule rated voltage, which is only half of the allowance of the selected MPPF capacitor. The findings are applied to a design example of a 21.8MW, 32kVdc grid-connected converter. Its operational region is firstly calculated using the proposed theory and then compared with simulation results.

Item Type: Conference Item (Lecture)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: 2014 IEEE Energy Conversion Congress and Exposition (ECCE)
Publisher: IEEE
Book Title: 2014 IEEE Energy Conversion Congress and Exposition (ECCE)
Official Date: 2014
Dates:
DateEvent
2014Published
Page Range: pp. 2080-2087
DOI: 10.1109/ECCE.2014.6953677
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Conference Paper Type: Lecture
Title of Event: Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Type of Event: Conference
Location of Event: Pittsburgh, PA
Date(s) of Event: 14-18 Sep 2014

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