Phasor Domain Steady-State Modeling and Design of the DC–DC Modular Multilevel Converter

Journal Article · Wed Jan 06 00:00:00 EST 2016 · IEEE Transactions on Power Delivery

DOI:https://doi.org/10.1109/TPWRD.2016.2515498· OSTI ID:1376524

Yang, Heng ^[1]; Qin, Jiangchao ^[1]; Debnath, Suman ^[2]; Saeedifard, Maryam ^[1]

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1. Georgia Inst. of Technology, Atlanta, GA (United States)
2. Purdue Univ., West Lafayette, IN (United States)

The DC-DC Modular Multilevel Converter (MMC), which originated from the AC-DC MMC, is an attractive converter topology for interconnection of medium-/high-voltage DC grids. This paper presents design considerations for the DC-DC MMC to achieve high efficiency and reduced component sizes. A steady-state mathematical model of the DC-DC MMC in the phasor-domain is developed. Based on the developed model, a design approach is proposed to size the components and to select the operating frequency of the converter to satisfy a set of design constraints while achieving high efficiency. The design approach includes sizing of the arm inductor, Sub-Module (SM) capacitor, and phase filtering inductor along with the selection of AC operating frequency of the converter. The accuracy of the developed model and the effectiveness of the design approach are validated based on the simulation studies in the PSCAD/EMTDC software environment. The analysis and developments of this paper can be used as a guideline for design of the DC-DC MMC.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1376524
• Journal Information: IEEE Transactions on Power Delivery, Vol. 31, Issue 5; ISSN 0885-8977
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
24 POWER TRANSMISSION AND DISTRIBUTION