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A Backup Protection Scheme for Hybrid HVDC Transmission System Combining Energy Function and Directional Criterion
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  • Zijiang WANG,
  • Youping Fan,
  • Yiming Wu,
  • Jianbin Fan,
  • Hao Hu,
  • Yinbiao Shu
Zijiang WANG
Wuhan University
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Youping Fan
Wuhan University

Corresponding Author:[email protected]

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Yiming Wu
Wuhan University
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Jianbin Fan
Wuhan University
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Hao Hu
Wuhan University
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Yinbiao Shu
Wuhan University
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Abstract

By combining the LCC rectifier and MMC converter, the hybrid HVDC transmission system reduces the construction cost while avoiding the commutation failure problem. However, traditional protection schemes for HVDC transmission systems are not fully suitable for the hybrid HVDC transmission system with two types of converters. A new backup protection scheme is proposed in this paper to improve the reliability of the hybrid HVDC transmission system. The energy functions for two types of converters are first constructed using data at the AC side to obtain the energy level of each converter. The backup protection scheme is then designed by calculating the improved Hausdorff distance change rates of energy levels, which is a supplement to the traditional protection scheme using DC voltage/current. Furthermore, a directional protection scheme is introduced to identify the fault near the T area. The proposed protection scheme is verified by the Wudongde ±800kV three-terminal hybrid HVDC transmission model built on PSCAD. The results show that the proposed protection scheme can identify the fault pole and the fault line even in the case of up to 800Ω fault resistance.