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A Single-Ended Protection Principle for LCC-VSC-MTDC System with High Resistance Fault Tolerance

Dahai Zhang*, Chuanjian Wu, Jinghan He

School of Electrical Engineering, Beijing Jiaotong University, Beijing, 100044, China

* Corresponding Author: Dahai Zhang. Email:

Energy Engineering 2023, 120(1), 1-21.


Line-commutated converter-voltage source converter (LCC-VSC) power transmission technology does not have the problem of communication failure very usually. It therefore can support the long-distance, long-capacity transmission of electric energy. However, factors such as topology, control strategy, and short-circuit capacities make the traditional protection principles not fully applicable to LCC-VSC hybrid transmission systems. To enhance the reliability of hybrid DC systems, a single-ended principle based on transmission coefficients is proposed and produced. First, the equivalent circuit of the LCC-VSC hybrid DC system is analyzed and the expression of the first traveling wave is deduced accordingly. Then, the concept of multi-frequency transmission coefficients is proposed by analyzing the amplitude-frequency, and the characteristics of each element. Finally, the LCC-VSCDC system model is built to verify the reliability and superiority of the principle itself. Theoretical analysis and experimental verification show that the principle has strong interference resistance.


Cite This Article

Zhang, D., Wu, C., He, J. (2023). A Single-Ended Protection Principle for LCC-VSC-MTDC System with High Resistance Fault Tolerance. Energy Engineering, 120(1), 1–21.

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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