An Adaptive Fault Current Limiting Control for MMC and Its Application in DC Grid

被引:40
作者
Ni, Binye [1 ]
Xiang, Wang [2 ]
Zhou, Meng [1 ]
Zuo, Wenping [1 ]
Yao, Wei [1 ]
Lin, Weixing [3 ]
Wen, Jinyu [1 ]
机构
[1] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Peoples R China
[2] Univ Strathclyde, Dept Elect & Elect Engn, Glasgow G1 1XW, Lanark, Scotland
[3] TBEA SunOasis Co Ltd, Urumqi 830011, Xinjiang, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Fault currents; Circuit faults; Voltage control; Limiting; Capacitors; Fault detection; Inductance; Modular multilevel converters (MMC); DC grid; DC circuit breaker (DCCB); DC fault; HVDC transmission; PROTECTION SCHEME;
D O I
10.1109/TPWRD.2020.2997089
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
This paper proposes an adaptive fault current limiting control (AFCLC) for modular multilevel converters (MMC). Without introducing extra current limiting devices, this control scheme enables fast fault current suppression during DC faults. The AFCLC will be triggered automatically once DC faults occur. By adaptively reducing the output DC voltages of MMCs, the fault current can be suppressed. Compared with the existing current limiting methods, the proposed AFCLC has a better performance on fault current limiting, since it only depends on the real-time operating condition and no fault detection delay is imposed. Firstly, the principle of the proposed AFCLC together with the mathematical analysis is disclosed. Then, the sensitivity analysis of the impact of key control parameters on the current limiting effect is investigated. Finally, the effectiveness of AFCLC is demonstrated in a four-terminal HVDC grid test model. The simulation results show that the proposed AFCLC can reduce the interrupted current and energy absorption of a DCCB from 10.39 kA and 38.24 MJ to 4.62 kA and 8.32 MJ, respectively. The simulation results also prove that the AFCLC will not affect the accuracy of the DC fault detection algorithms under DC faults.
引用
收藏
页码:920 / 931
页数:12
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