摘要
随着智能变电站的建设和就地保护的应用,出现采样异常大数的概率越来越高,这对母线保护的可靠性提出了更高的要求。提出一种应用于母线保护的识别采样异常的新方法,通过线性插值的方法虚拟出一个母线保护差流,比较实际计算的差流与虚拟差流的差异,能够准确区分出故障及异常大数,与已有算法相比具有数据窗小、能解决多点采样异常等优势。通过仿真试验验证,该方法有效可行,能够消除采样异常大数对母线保护的影响,提高了母线保护的可靠性。
With the application of intelligent substation and localized protection,the probability of sampling abnormal great number is increasing.This required higher reliability of busbar protection.This paper introduced a new approach to recognize abnormal sampling.By linear interpolation,the virtual busbar protection difference current could be calculated.To compare actual and calculated difference current,fault and abnormal great number could be accurately distinguished.This method was approved by simulation,and is able to effectively eliminate the effect of sampling abnormal great number on busbar protection,and increase busbar protection reliability.
出处
《华电技术》
CAS
2017年第4期1-3,7,共4页
HUADIAN TECHNOLOGY
关键词
母线差动保护
异常大数
虚拟差流
线性插值
差异系数
busbar differential protection
abnormal great number
virtual difference current
linear interpolation
difference coefficient
