Protection Scheme for Transient Impedance Dynamic-Time-Warping Distance of a Flexible DC Distribution System

Pinghao Ni, Jinghan He (), Chuanjian Wu, Dahai Zhang, Zhaoxiang Yuan and Zhihong Xiao
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Pinghao Ni: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Jinghan He: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Chuanjian Wu: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Dahai Zhang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Zhaoxiang Yuan: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Zhihong Xiao: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China

Sustainability, 2023, vol. 15, issue 17, 1-20

Abstract: Flexible DC power distribution systems have characteristics such as rapid fault occurrence and fragile power electronics. DC faults usually result in rapid converter blocking (2–5 ms). However, existing protection schemes are susceptible to distributed capacitance, cannot tolerate long communication delays, and require artificial boundaries, among other features that make it impossible to combine speediness, selectivity, and reliability. A technique based on normalized transient impedance dynamic-time-warping (DTW) distance is proposed to improve the performance of the protection scheme. First, the fault equivalent circuit of the flexible DC distribution system (±10 kV) is established, and its transient impedance expression is derived accordingly. Subsequently, the expression components are split and their fault characteristics are resolved separately. Finally, the protection scheme for normalized DTW distance is proposed based on the transient impedance fault characteristics. A flexible DC distribution system (±10 kV) is established to verify the performance of the scheme.

Keywords: flexible DC distribution system; double-ended protection; distributed power supply; distributed capacitance; communication delay; noise; fault resistance (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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