Abstract：The fault-generated high-frequency signals in EHV transmission line is a series of natural frequencies in frequency domain. They vary with fault location, operation mode of system and fault resistance. For the lack of frequency resolution for FFT algorithm when high sampling frequency, natural frequencies can’t be sampled accurately. A new method based on multiple analytical band-pass filter is presented to extract natural frequencies adaptively. Firstly, the approximate range of natural frequency is determined from spectrum, then the signals are resampled and filtered through a multiple analytical band-pass filter, and the natural frequency is extracted accurately after shift frequency by analyzing spectrum of resampling signal using FFT. A typical 500kV system in PSCAD is used to verify the performance. The simulation results show that the method presented can improve frequency resolution and natural frequency can be extracted accurately.
王兴国, 黄少锋. 基于复解析带通滤波器的固有频率自适应提取原理和方法[J]. 电工技术学报, 2009, 24(12): 179-184.
Wang Xingguo, Huang Shaofeng. Natural Frequency Adaptive Extracting Principle and Method Based on Multiple Analysis Band-Pass Filter. Transactions of China Electrotechnical Society, 2009, 24(12): 179-184.
[1] Johns A T, Aggarwal R K, Bo Z Q. Non-unit protection technique for EHV transmission systems based on fault-generated noise. Part 1: signal measurement[J].IEE Proc-Gener. Transm. Distrib, 1994, 141(2): 137-140. [2] 哈恒旭, 张保会, 吕志来, 等. 超高压输电线单端暂态量保护的新原理探讨[J]. 电工技术学报, 2001, 16(6): 65-69. [3] 司大军, 束洪春, 陈学允. 一种基于行波测距的输电线路接地故障距离保护方案[J]. 电工技术学报, 2003, 18(4): 65-69. [4] 胡巨, 杨明玉. 基于小波包变换的暂态保护在带TCSC输电线路中的应用[J]. 电工技术学报, 2004, 19(12): 83-85. [5] 和敬涵, 范瑜, 薄志谦. 基于对称分量变换的暂态电流极性方向比较保护算法[J]. 电工技术学报, 2007, 22(2): 116-120. [6] Bo Z Q. A new non-communication protection technique for transmission lines[J]. IEEE Transac- tions on Power Delivery, 1998, 113(4): 1073-1078. [7] Giovanni Miano. Transmission lines and lumped circuits[M]. San Diego : Academic Press, 2001. [8] Swift G W. The spectra of fault induced transient[J]. IEEE Transactions on Power Apparatus and Systems, 1979, PAS-98(3): 940-946. [9] 黄少锋, 王兴国. 一种基于固有频率的超高压线路相间保护方案[J]. 电力系统自动化, 2008, 32(19) : 58-62. [10] 黄少锋, 王兴国, 刘千宽. 一种基于固有频率的长距离输电线路保护方案[J]. 电力系统自动化, 2008, 32(8):59-63. [11] Styvaktakis E, Bollen M H J, Gu H Y. A fault location technique using high frequency fault clearing transients[J]. IEEE Power Engineering Review, 1999, 19(5):58-60. [12] 邬林勇, 何正友, 钱清泉. 利用CVT二次信号的频域行波故障测距方法[J]. 电力系统自动化, 2008, 32(8): 73-77. [13] 高中德. 超高压电网继电保护专题分析[M]. 北京: 水利电力出版社, 1990. [14] 丁康, 谢明, 等. 基于复解析带通滤波器的复调制细化谱分析原理和方法[J]. 振动工程学报, 2001, 14(1): 29-35. [15] 宗孔德. 多抽样率信号处理[M]. 北京: 清华大学出版社, 1996.
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