Double-Thyristor-Based Protection for Valve-Side Single-Phase-to-Ground Faults in HB-MMC-Based Bipolar HVDC Systems

被引：37
作者：
Li, Gen [1 ]
Liu, Wei [1 ]
Joseph, Tibin [1 ]
Liang, Jun [1 ]
Song, Ziming [2 ]
机构：
[1] Cardiff Univ, Sch Engn, Cardiff CF24 3AA, Wales
[2] Toshiba Int Europe Ltd, Uxbridge UB11 1EZ, Middx, England
来源：
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2020年 / 67卷 / 07期
基金：
英国工程与自然科学研究理事会; 欧盟地平线“2020”;
关键词：
Circuit faults; Grounding; Thyristors; HVDC transmission; Voltage control; Capacitors; Impedance; Bipolar high-voltage direct-current (HVdc); double-thyristors; modular multilevel converter (MMC) protection; single-phase fault; valve-side fault; LINES; VSC;
D O I：
10.1109/TIE.2019.2931502
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
The valve-side single-phase-to-ground (SPG) faults in the half-bridge modular multilevel converter (HB-MMC)-based bipolar high-voltage direct-current (HVdc) systems induce some special fault consequences: overvoltage on the submodule (SM) capacitors in converter upper arms and nonzero-crossing currents in the grid-side ac circuit breaker (ACCB). In this letter, a protection strategy based on converter-embedded double-thyristors is proposed to address these issues. The double-thyristors are installed in parallel with each SM in the lower arms of the converter. By triggering the double-thyristors, the SPG fault is converted into a three-phase short-circuit that ensures current zero-crossings in the grid-side ACCB. Moreover, as the voltages of converter ac buses are clamped by the ground through the triggered double-thyristors, the upper arm overvoltage is mitigated. The effectiveness of the proposed protection strategy has been verified in a bipolar HB-MMC HVdc link built in PSCAD/EMTDC.
引用
收藏
页码：5810 / 5815
页数：6
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