A DC Line Protection Scheme for MMC-Based DC Grids Based on AC/DC Transient Information

被引：18

作者：

He, Yangyang ^{[1
]}

Zheng, Xiaodong ^{[1
]}

Tai, Nengling ^{[1
]}

Wang, Jing ^{[2
]}

Nadeem, Muhammad Haroon ^{[1
]}

Liu, Jian ^{[3
]}

机构：

[1] Shanghai Jiao Tong Univ, Minist Educ, Key Lab Control Power Transmission & Convers, Shanghai 200240, Peoples R China

[2] State Grid Hubei Elect Power Co, Jingzhou0 430000, Hubei, Peoples R China

[3] Hangzhou Power Supply Co, State Grid Zhejiang Elect Power Co, Hangzhou 310009, Peoples R China

来源：

IEEE TRANSACTIONS ON POWER DELIVERY | 2020年 / 35卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Grounding; Inductors; Transient analysis; Circuit faults; Fault diagnosis; Fault currents; HVDC transmission; Protection scheme; MMC-based DC grid; AC; DC transient information; fault criterion setting method; NONUNIT PROTECTION; HVDC;

D O I：

10.1109/TPWRD.2020.3026100

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

With the rapid development of renewable energy, multi-terminal flexible DC grids composed of modular multilevel converters have been widely used in power systems. To ensure the safe and stable operation of a DC grid, this paper proposes a DC line protection scheme for MMC-based DC grids using AC/DC transient information. In the proposed scheme, the difference between the transient voltage root mean square ratios (DTVR) on both sides of the current-limiting inductor of DC lines is used to identify the DC line fault, and the instantaneous zero sequence voltage (IZSV) of the AC side of the converter station is used to discriminate the faulted poles. According to the theoretical analysis result, a fault criterion setting method suitable for faulted pole discrimination is proposed. The proposed scheme is based on local information and tested in a PSCAD/EMTDC model of a four-terminal MMC-based DC grid. The simulation results show that the scheme can fast and accurately identify faults.

引用

页码：2800 / 2811

页数：12

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