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Energies 2018, 11(2), 264; https://doi.org/10.3390/en11020264

Simplified Analytic Approach of Pole-to-Pole Faults in MMC-HVDC for AC System Backup Protection Setting Calculation

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Hubei Electric Power Security and High Efficiency Key Laboratory, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Received: 29 November 2017 / Revised: 19 January 2018 / Accepted: 19 January 2018 / Published: 23 January 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

AC (alternating current) system backup protection setting calculation is an important basis for ensuring the safe operation of power grids. With the increasing integration of modular multilevel converter based high voltage direct current (MMC-HVDC) into power grids, it has been a big challenge for the AC system backup protection setting calculation, as the MMC-HVDC lacks the fault self-clearance capability under pole-to-pole faults. This paper focused on the pole-to-pole faults analysis for the AC system backup protection setting calculation. The principles of pole-to-pole faults analysis were discussed first according to the standard of the AC system protection setting calculation. Then, the influence of fault resistance on the fault process was investigated. A simplified analytic approach of pole-to-pole faults in MMC-HVDC for the AC system backup protection setting calculation was proposed. In the proposed approach, the derived expressions of fundamental frequency current are applicable under arbitrary fault resistance. The accuracy of the proposed approach was demonstrated by PSCAD/EMTDC (Power Systems Computer-Aided Design/Electromagnetic Transients including DC) simulations. View Full-Text
Keywords: AC (alternating current) system backup protection; setting calculation; MMC-HVDC (multi-modular converter based high voltage direct current); pole-to-pole faults; fault analysis AC (alternating current) system backup protection; setting calculation; MMC-HVDC (multi-modular converter based high voltage direct current); pole-to-pole faults; fault analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Lan, T.; Li, Y.; Duan, X.; Zhu, J. Simplified Analytic Approach of Pole-to-Pole Faults in MMC-HVDC for AC System Backup Protection Setting Calculation. Energies 2018, 11, 264.

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