Open AccessPositive sequence pilot impedance protection of AC tie line based on MMC-HVDC system
Author(s) -
Zhiyong Yang,
Binsheng Yang
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2137/1/012025
Subject(s) - fault (geology) , electrical impedance , power (physics) , high impedance , line (geometry) , control theory (sociology) , impedance bridging , engineering , sequence (biology) , power grid , computer science , impedance matching , electrical engineering , mathematics , damping factor , physics , chemistry , geometry , control (management) , quantum mechanics , artificial intelligence , geology , biochemistry , seismology
MMC-HVDC has the characteristics of limited amplitude, controlled phase angle and unequal positive and negative sequence impedance. Therefore, the fault characteristics of flexible direct system and AC power grid tie line are quite different from traditional synchronous power supply, which may affect the performance of AC power grid sudden variable protection. Therefore, a new AC protection method based on positive sequence current sudden variable impedance is proposed. The results show that when an in zone fault occurs, the direction of current sudden changes at both ends is the same, and the positive sequence impedance may approach the line impedance; When an out of area fault occurs, the current abrupt variables at both ends have opposite directions and equal sizes, and the positive sequence impedance is much greater than the line impedance. Based on the above characteristics, the criteria of fault start up and fault type are constructed. The simulation results show that the protection method can realize fault discrimination quickly and reliably.