A Research on Multi Digital Source Differential Protection
In a digital substation,protection equipment may get data from different digital sources.This paper researched a form of multi digital sources.As link devices between primary side and secondary side,optical current transformers (OCT) may run on different sampling frequencies.Literatures have proposed that by the means of TCFIR 1,differential protection can get signals with the same sampling frequency in each branch.According to Nyquist Sampling Theorem,anti-aliasing filters set in front of OCTs with different sampling frequencies would also have different cut-off frequency.An effective method is presented in this paper.Different current error caused by different filters can be reduced by doing frequency domain compensation on current signal according to filters frequency domain characteristics.These methods are confirmed by simulation in MATLAB.
multi digital source:differential protection:optical current transformer:frequency domain conversion:anti-aliasing filter
Jinfeng Lu Yuping Lu Chunfeng Wang Chao Cai
School of Electrical Engineering Southeast University Nanjing 210096,China
国际会议
威海
英文
1449-1453
2011-07-06（万方平台首次上网日期，不代表论文的发表时间）