NDLI: Efficient Grounding for Modular Multilevel HVDC Converters (MMC) on the AC Side

Content Provider	IEEE Xplore Digital Library
Author	Haitian Wang Guangfu Tang Zhiyuan He Jie Yang
Copyright Year	1986
Abstract	An unbalance voltage between a positive pole and negative pole will exist for a long time in an ungrounded modular multilevel converter (MMC) HVDC transmission system. A zig-zag transformer has been proposed to construct an artificial neutral point and keep voltage balance between the positive pole and the negative pole. An efficient grounding system consists of the zig-zag transformer and the neutral grounding resistor. In this paper, the different impedances, including positive-, negative-, zero-sequence impedance, and dc current impedance, have been analyzed, respectively. Then, the computer simulations have been performed to evaluate the characteristic of the zig-zag transformer under normal voltage, zero-sequence voltage and unbalanced dc voltage, respectively. The simulation results show that the zig-zag transformer can effectively balance the unbalanced voltage in dc side of the MMC under different work conditions; the zero-sequence impedance is low and zero-sequence current is convenient for the detection of a single-phase fault; the power consumption of the neutral grounding resistor is of a light rating, and the cooling of the resistor is unnecessary. The method presented in this paper proves to be an efficient grounding method for the MMC-HVDC transmission system.
Sponsorship	IEEE Power Engineering Society
Starting Page	1262
Ending Page	1272
Page Count	11
File Size	1540135
File Format	PDF
ISSN	08858977
Volume Number	29
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Grounding Phase transformers Power transformer insulation Impedance Magnetic cores Resistance HVDC transmission zig-zag transformer Modular multilevel converter (MMC) negative-sequence impedance positive-sequence impedance system grounding voltage-source converter (VSC) zero-sequence impedance
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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