Non-Unit DC Line Protection Method for Multi-Terminal MMC-HVDC System Based on Normalized Backward Traveling Waves

Conference paper (2023)

Authors

F. Xie Xi’an Jiaotong University, Intelligent Electrical Power Grids -

L. Liu Intelligent Electrical Power Grids -

Zhiguo Hao Xi’an Jiaotong University

A. Lekić Intelligent Electrical Power Grids -

Aleksandra Lekić Intelligent Electrical Power Grids -

Aleksandra Lekic Intelligent Electrical Power Grids -

A. Lekic Intelligent Electrical Power Grids -

M. Popov Intelligent Electrical Power Grids -

Research Group

Intelligent Electrical Power Grids () (TU Delft)

Modular multilevel converter Non-unit protection Traveling wave Levenberg-Marquardt algorithm Multi-terminal DC grid

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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

Intelligent Electrical Power Grids

Abstract

Existing line protection methods for multi-terminal direct current (MTDC) systems are constrained by the placement and values of boundary elements. To overcome this limitation, this paper proposes a non-unit DC line protection method based on the normalized backward traveling waves (BTWs) of the 1-mode voltage. Firstly, this article studies the traveling wave characteristics and derives the expressions for the normalized BTWs. Then, the Levenberg-Marquardt algorithm is used for amplitude fitting and normalization calculation. Based on the normalized BTWs, a non-unit protection method is proposed. Finally, the proposed method is evaluated with a simulation model on the PSCAD/EMTDC platform. The results demonstrate that the proposed method can accurately identify faults of different resistances and distances without requiring boundary devices, and is robust against noise disturbances (35 dB).

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