Fast Distance Protection Scheme for Wind Farm Transmission Lines Considering R-L and Bergeron Models

Hu Zepeng; Li Bin; Zheng Yuping; Wu Tonghua; He Jiawei; Yao Bin; Sheng Yaru; Dai Wei; Li Xindong

DOI:10.35833/MPCE.2021.000423


Fast Distance Protection Scheme for Wind Farm Transmission Lines Considering R-L and Bergeron Models



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Author: Zepeng Hu¹,Bin Li¹,Yuping Zheng²,Tonghua Wu²,Jiawei He¹,Bin Yao¹,Yaru Sheng¹,Wei Dai²,Xindong Li²
Author Affiliation: 1.the Electrical Engineering and Automation, Tianjin University, Tianjin, China;2.the State Key Laboratory of Smart Grid Protection and Control, NARI Group Corporation, Nanjing, China
Foundation:	This work was supported by the Science and Technology Program of State Grid Corporation of China “Research on the Principle of Fast Protection in Time-frequency Domain with Single-ended Quantities of High-proportion New Energy Grid Lines” (No. 5100-202040327A-0-0-00).

Abstract:	The distributed capacitance of the line becomes larger as the scale of wind farms, the transmission voltage level, and the transmission distance increase. Hence, the error of the traditional time-domain distance protection scheme based on the R-L model, which ignores the distributed capacitance of the line, becomes unacceptable. Therefore, the error of the time-domain fault location method based on the R-L model, especially the maximum error range, is theoretically analyzed in this paper. On this basis, a novel fault location method based on the R-L and Bergeron models is proposed. Then, a fast time-domain distance protection scheme is designed. In the proposed scheme, the error in the fitting calculation is used to construct a weight matrix, and an algorithm for solving the time-domain differential equations is designed to improve the calculation speed and stability. Compared with the traditional frequency-domain distance protection scheme, the proposed scheme is independent of the power supply characteristics; thus, it is suitable for wind farm transmission lines. In addition, compared with the traditional method based on the R-L model, the proposed scheme effectively avoids the negative influence of the distributed capacitance of the line, which significantly improves the operating speed. Different types of faults are simulated by PSCAD/EMTDC to verify the effectiveness and superiority of the proposed scheme.
Keywords:	Transmission line ; R-L model ; time-domain distance protection ; wind farm

Received:June 29, 2021 Online Time:2023/05/23



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