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Regular Paper | Open Access

Energy-function Based Pilot Protection Scheme for Hybrid UHVDC Transmission Applying Improved Hausdorff Distance

Zijiang Wang, Youping Fan( ), Ben Shang, Yinbiao Shu
School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China, and also with the Institute of Next Generation Power Systems & International Standards, Wuhan University, Wuhan 430072, China
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Abstract

A hybrid UHVDC transmission system applying LCC as the rectifier and MMC as the inverter combines the advantages of both converter types, which makes this protection scheme more complicated. A new pilot protection scheme for a three-terminal hybrid DC transmission system applying energy functions is proposed. The energy function for LCC is applied to MMC to derive the energy level of the hybrid system. Furthermore, an improved Hausdorff distance (IHD) algorithm is proposed to detect the difference in energy levels between the normal and fault states. An abrupt change in energy level is characterized by IHD change rate. Time points at which the IHD change rate exceeds the threshold at converter stations are applied to determine the fault line and to estimate the fault section. The proposed protection scheme is then verified by a simulation model of the Wudongde ±800 kV three-terminal hybrid UHVDC transmission project. The appropriate sampling frequency is selected for a real-time calculation, and the threshold is selected considering the effect of noise. Results show the proposed scheme can identify and trip fault lines quickly and effectively, even for a 600 Ω grounding fault. Other waveshape similarity algorithms are compared and analyzed. Compared with existing protection schemes, the proposed scheme transmits less data to improve communication speed and reliability.

Keywords

Energy functionHausdorff distancepilot protectionUHVDC transmission

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CSEE Journal of Power and Energy Systems
Volume 10 Issue 3,
May 2024
Pages 891-902
DOI: 10.17775/CSEEJPES.2022.01330
Cite this article:
Wang Z, Fan Y, Shang B, et al. Energy-function Based Pilot Protection Scheme for Hybrid UHVDC Transmission Applying Improved Hausdorff Distance. CSEE Journal of Power and Energy Systems, 2024, 10(3): 891-902. https://doi.org/10.17775/CSEEJPES.2022.01330

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Received: 03 March 2022
Revised: 03 July 2022
Accepted: 25 July 2022
Published: 03 March 2023
© 2022 CSEE.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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