NDLI: A switching frequency reduction and a mitigation of voltage fluctuation of modular multilevel converter for HVDC

Content Provider	IEEE Xplore Digital Library
Author	Hak-Jun Lee Jae-jung Jung Seung-Ki Sul
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Seoul Nat. Univ., Seoul, South Korea (Jae-jung Jung; Seung-Ki Sul) \|\| Corp. Technol. R&D Center, LSIS Co., Ltd., Anyang, South Korea (Hak-Jun Lee)
Abstract	A switching loss of Modular Multilevel Converter(MMC) might increase drastically in HVDC system because the number of sub-module(SM) is proportional to the DC-link voltage. And, a special strategy for reducing switching frequency has been significant research issue in terms of overall operating efficiency of MMC for HVDC system. The voltage fluctuation of capacitor in SM, however, increases as the switching frequency decreases, and the capacitor with large capacitance which is the main portion of equipment cost for SM is required to mitigate the voltage fluctuation. In this paper, the switching frequency reduction strategy is proposed using the sorting method with a virtual capacitor voltage of individual SMs. In addition, this paper presents the $2^{nd}$ order harmonic circulating current injection to suppress the voltage fluctuation. By numerical loss analysis, it is identified that the $2^{nd}$ order harmonic current injection does not incur severe additional loss. Thanks to the harmonic current injection, the capacitance of SM capacitor could be reduced by 33% at the cost of only 0.05 % efficiency degradation in the given simulation condition. To evaluate the effectiveness of the proposed strategies, the computer simulation with 400 kV, 400MA, 221-level MMC has been performed and the results are discussed. Additionally, validity of the proposed strategies has been verified by 7-level down scaled prototype experimental setup.
Starting Page	483
Ending Page	490
File Size	1866569
Page Count	8
File Format	PDF
ISBN	9781479957767
DOI	10.1109/ECCE.2014.6953433
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switching frequency reduction Modular Multilevel Converter Voltage fluctuations Fluctuations MMC Switching frequency Capacitors Switches Harmonic analysis Sorting HVDC
Content Type	Text
Resource Type	Article

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