随机共振在谐振接地系统故障选线中的应用

Application of Stochastic Resonance in Fault Line Selection of Resonant Grounding System

传统的信号注入法在应用于中性点经消弧线圈接地系统单相接地故障选线时选线精度不高。随机共振能够将噪声的部分能量转移给微弱周期信号,使输出信号的功率谱中特定频率信号的幅值增大,更易于被检测提取。该文提出基于传统信号注入法和变尺度随机共振理论相结合的新型选线方法,故障线路注入的特定频率信号幅值明显增大,而非故障线路的原始注入信号幅值不变,两者相比较即可正确选线。该算法极大地提高了选线准确率。Matlab仿真验证了此选线法的可行性和抗干扰性。

When the traditional signal injection method is applied to the single-phase ground fault line selection of the neutral point through the arc suppression coil grounding system,the line selection accuracy is not high.Stochastic resonance can transfer part of the energy of the noise to a weak periodic signal,so that the amplitude of the specific frequency signal in the power spectrum of the output signal increases,and it is easier to be detected and extracted.A new line selection method based on the combination of traditional signal injection method and variable-scale stochastic resonance theory is proposed.The amplitude of the specific frequency signal injected by the fault line is significantly increased;the original injection signal amplitude of the non-fault line is unchanged,and the two are compared You can select the line correctly.This algorithm greatly improves the accuracy of line selection.Matlab simulation verified the feasibility and anti-interference of this line selection method.