Size reduction of 6.6-kV multi-level power converter using new hybrid cell structure

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630105
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Nagaoka University of Technology
• Principal Investigator: ITOH JUNICHI 長岡技術科学大学, 工学(系)研究科(研究院), 准教授 (90377218)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: マルチレベル電力変換器 / 高電圧 / AC-DC変換

Outline of Final Research Achievements

This report describes outcomes of a study for Modular Multilevel Converter (MMC) with Hybrid cells. The main contents are as follows; (i) Consideration for fundamental operation of the MMC, (ii) Proposal of control method for the MMC, (iii) Volume evaluation of the proposed system. Moreover, the results are as follows; (i) Required PWM patterns was generated by virtual indirect control, (ii) A Miniature model of the MMC achieved a power conversion and retaining of capacitor voltage, (iii) Conditions in order to achieve volume reduction were clarified. Finally, the volume of the proposed system is approximately 50% of the volume of the conventional system.
From the above results, it was confirmed that the proposed MMC with Hybrid cells achieves the volume reduction and the cost reduction because of the reduction of the number of switching devices.

Free Research Field

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