TY - JOUR
T1 - A non-unit line protection method for MMC-HVDC grids based on the curvatures of backward traveling waves
AU - Xie, Fan
AU - Hao, Zhiguo
AU - Ye, Dongmeng
AU - Yang, Songhao
AU - Li, Chuanxi
AU - Dai, Guoan
AU - Zhang, Baohui
AU - Wang, Ting
PY - 2023
Y1 - 2023
N2 - The existing protection techniques for high-voltage direct-current (HVDC) grids suffer from several shortcomings such as high sampling frequency, poor robustness, and reliance on simulation for threshold setting. To solve these problems, this paper proposes a non-unit protection method for modular multilevel converter (MMC)-based HVDC grids using the curvatures of backward traveling waves. To this end, the propagation characteristics of traveling waves and the boundary characteristics of DC lines are first studied, then the analytical expressions of backward traveling waves are derived. Moreover, the curvatures of backward traveling waves are analyzed. On this basis, a non-unit protection method is proposed, including zone selection, disturbance identification, and pole selection. At last, with a protection platform and a real-time digital simulator (RTDS) platform of the MMC-HVDC grid, the accuracy and the robustness of the proposed protection method are verified. The results show that the protection method can correctly identify faults with different distances and resistance in 1 ms and has strong robustness against transition resistance, sampling frequency, boundary value, noise, system topology, and line parameters.
AB - The existing protection techniques for high-voltage direct-current (HVDC) grids suffer from several shortcomings such as high sampling frequency, poor robustness, and reliance on simulation for threshold setting. To solve these problems, this paper proposes a non-unit protection method for modular multilevel converter (MMC)-based HVDC grids using the curvatures of backward traveling waves. To this end, the propagation characteristics of traveling waves and the boundary characteristics of DC lines are first studied, then the analytical expressions of backward traveling waves are derived. Moreover, the curvatures of backward traveling waves are analyzed. On this basis, a non-unit protection method is proposed, including zone selection, disturbance identification, and pole selection. At last, with a protection platform and a real-time digital simulator (RTDS) platform of the MMC-HVDC grid, the accuracy and the robustness of the proposed protection method are verified. The results show that the protection method can correctly identify faults with different distances and resistance in 1 ms and has strong robustness against transition resistance, sampling frequency, boundary value, noise, system topology, and line parameters.
KW - Curvatures
KW - HVDC grids
KW - Modular multilevel converters
KW - Non-unit protection
KW - Traveling waves
UR - http://www.scopus.com/inward/record.url?scp=85165974241&partnerID=8YFLogxK
U2 - 10.1016/j.ijepes.2023.109373
DO - 10.1016/j.ijepes.2023.109373
M3 - Article
AN - SCOPUS:85165974241
SN - 0142-0615
VL - 153
JO - International Journal of Electrical Power and Energy Systems
JF - International Journal of Electrical Power and Energy Systems
M1 - 109373
ER -