Fault Analysis and Protection of Ring DC Microgrid
Basic Research|更新时间:2025-06-16
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Fault Analysis and Protection of Ring DC Microgrid
Automation of Electric Power SystemsVol. 44, Issue 24, Pages: 105-110(2020)
作者机构:
1.西安理工大学电气工程学院,陕西省西安市 710048
2.电力系统及大型发电设备安全控制和仿真国家重点实验室,清华大学,北京市 100084
作者简介:
基金信息:
National Natural Science Foundation of China;Shaanxi Provincial Key Research and Development Plan of China;Shaanxi Provincial Natural Science Foundation of China
ZHANG Weiliang,ZHANG Hui,ZHI Na,et al.Fault Analysis and Protection of Ring DC Microgrid[J].Automation of Electric Power Systems,2020,44(24):105-110. DOI: 10.7500/AEPS20200423004.
Fault Analysis and Protection of Ring DC Microgrid
The rapid detection and removal of faults are the key to improving the operation reliability of DC microgrids. The current differential protection can remove the fault quickly and selectively. But it is greatly affected by the short-circuit impedance
and it may refuse to operate in the cases of the high impedance short circuit. For ring DC microgrids
a differential protection based on change rates of bus power is proposed. The power change rates of both sides of the bus are taken to formulate the differential value. The differential value of the change rates of bus power is bigger than the operation setting in the case of internal fault
and the protection will operate and remove the fault line. The differential value of the power change rates is proportional to the square of short-circuit current and short-circuit impedance. Compared with protection schemes based on current
it has faster fault identification speed and higher protection sensitivity. The simulation results show that the proposed protection scheme has better operation speed and sensitivity
and improves the reliability and stability of the ring DC microgrid.
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