Fault Detection and Interruption in an Earthed HVDC Grid Using ROCOV and Hybrid DC Breakers
Fault Detection and Interruption in an Earthed HVDC Grid Using ROCOV and Hybrid DC Breakers
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DOI：
10.1109/pesgm.2015.7285879
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发表时间：
2015-07
影响因子：
4.4
通讯作者：
Jeremy Sneath;A. Rajapakse
中科院分区：
文献类型：
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作者：
Jeremy Sneath;A. Rajapakse
不同的HVDC电网类型和各自的保护选项进行了讨论。在PSCAD中对双极HVDC电网进行建模，并利用仿真结果，证明了di/dt限制电感器在电流混合直流断路器容量内包含故障电流上升的必要性。研究了不同电感尺寸对电流上升的影响。提出了一种利用di/dt限幅电抗器线路侧电压变化率进行故障检测和定位的方法。在不同的故障类型和位置下对保护系统进行了建模和测试。结果表明，采用目前的混合式直流断路器技术，所提出的直流电网保护方法是可行的。一个系统的程序设置必要的保护阈值也证明。
Different HVDC grid types and the respective protection options are discussed. An earthed bipole HVDC grid was modeled in PSCAD, and using simulation results, the necessity of di/dt limiting inductors to contain the rise of fault currents within the capacity of current hybrid dc breakers is demonstrated. The impact of different inductor sizes on current rise was studied. A fault detection and localization scheme using the rate of change of voltage measured at the line side of the di/dt limiting reactors is proposed. The protection system was modeled and tested under different fault types and locations. The results show that the proposed method of HVDC grid protection is feasible using the current hybrid dc breaker technology. A systematic procedure for setting the necessary protection threshold values is also demonstrated.