DC Fault Protection Based on Hybrid Bypass and System Recovery Strategy in MMC-HVDC

被引：0
|
作者：
Yang M. [1 ]
Xie Z. [1 ]
机构：
[1] College of Electrical & Automation Engineering, Fuzhou University, Fuzhou
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 02期
关键词：
DC bipolar short-circuit fault; Flexible HVDC; Hybrid bypass; STATCOM; System reclosing;
D O I：
10.13336/j.1003-6520.hve.20190130029
中图分类号：
学科分类号：
摘要：
The protection of DC line faults is a key issue for the flexible high-voltage direct current system using modular multilevel converter (MMC-HVDC). Firstly, we analyzed the principle and separation step based on hybrid bypass of dc fault isolation. It is found that the fault current is transferred through the bypass bridge arm, and the fast mechanical switch will be opened in the zero current to realize the physical isolation of converter station and DC-link, and then eliminate dc fault current. In system recovery, an unlock the sub-module is not needed, whether dc fault is eliminated or not can be judged by conducing the bypass bridge arm, and then the fast mechanical switch is closed under the zero voltage and system recovery running. When DC fault belongs to permanent one, the converter station can run as STATCOM. The DC fault protection scheme can deal with both permanent and transient DC bipolar short-circuits and faults effectively. Finally, a model of a two-terminal monopolar HVDC grid is developed in PSCAD/EMTDC to prove the feasibility of this scheme. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
引用
收藏
页码：564 / 570
页数：6
相关论文
共 14 条
  • [1] Xu Z., Liu G., Zhang Z., Research on fault protection principle of DC grids, High Voltage Engineering, 43, 1, pp. 1-8, (2017)
  • [2] Li B., Li Y., He J., Research on the key properties of MMC sub-modules with DC fault eliminating capability, Proceedings of the CSEE, 36, 8, pp. 2114-2122, (2016)
  • [3] Chang F., Wang Y., Wang Y., Et al., Multilevel sub-module topology of MMC with DC fault clearance capability, High Voltage Engineering, 41, 7, pp. 2428-2434, (2015)
  • [4] Wang Y., Liu J., An enhanced MMC-HVDC topology and system recovery strategy for DC fault protection, Power System Technology, 39, 8, pp. 2312-2319, (2015)
  • [5] Guo J., Zeng D., Wang G., Et al., Auxiliary equipment based processing strategy for MMC-HVDC DC faults, Automation of Electric Power Systems, 40, 16, pp. 90-97, (2016)
  • [6] Fang C., Wang M., Li W., Et al., Design on multiple isolated drive power supply of hybrid DC circuit breaker, High Voltage Engineering, 42, 5, pp. 1746-1753, (2016)
  • [7] Zhang Z., Li X., Ceng M., Et al., Research on fast mechanical switch in hybrid HVDC circuit breaker, Southern Power System Technology, 10, 4, pp. 57-62, (2016)
  • [8] Schmitt D., Wang Y., Weyh T., Et al., DC-side fault current management in extended multiterminal-HVDC-grids, 9th International Multi-Conference on Systems, Signals and Devices, pp. 1-5, (2012)
  • [9] Marquardt R., Modular multilevel converter topologies with DC-short circuit current limitation, 8th International Conference on Power Electronics-ECCE Asia, pp. 1425-1431, (2011)
  • [10] Li H., Xing D., Gao Y., Et al., A DC pole-to-pole fault current suppression strategy of the half-and full-bridge based cell-hybrid modular multilevel converter, Power System Protection and Control, 44, 20, pp. 57-64, (2016)
12