考虑电容投切扰动的配电网高阻接地故障检测方法  

High-impedance Grounding Fault Detection Method for Distribution Network Considering Capacitor Switching Disturbance

作　　者：韩兆儒 石访 张恒旭[1] 靳宗帅 贠志皓[1] HAN Zhaoru;SHI Fang;ZHANG Hengxu;JIN Zongshuai;YUN Zhihao(School of Electrical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学电气工程学院,山东省济南市250061

出　　处：《电力系统自动化》2024年第21期180-191,共12页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52107109);山东省自然科学基金资助项目(ZR2021QE145)

摘　　要：高阻接地故障的准确、可靠检测是配电网故障处理的难点,正常的电容投切操作可对其产生干扰。针对这一问题,文中提出了一种基于零序李萨如曲线分析的高阻接地故障抗扰检测方法。首先,理论推导了高阻接地故障与电容投切扰动的零序电气量,二者在传统时频域特征角度无规律性差异,从而明确了干扰原因;进一步,将零序电流、电压波形重构为零序李萨如曲线,提出了基于数学形态学理论的李萨如曲线轨迹形状畸变复杂度量化指标,并结合零序李萨如曲线面积概率分布规律设计自适应启动判据,给出了噪声场景下高阻接地故障的抗扰检测方法;最后,利用配电网电磁暂态仿真算例和真型故障试验验证了所提方法的有效性和可靠性。The accurate and reliable detection of high-impedance grounding fault(HIGF)is challenging in the fault handling of distribution networks,and the normal capacitor switching operations can cause interference.Addressing this problem,a disturbance-resistant detection method for HIGFs based on zero-sequence Lissajous curve analysis is proposed in this paper.First,the zero-sequence electrical quantities of HIGFs and capacitor switching disturbances are theoretically derived.There is no regular difference from the perspective of traditional time-frequency domain features between the two,thereby clarifying the cause of the interference.Further,the zero-sequence current and voltage waveforms are reconstructed into zero-sequence Lissajous curves.A quantitative index for the distortion complexity of the Lissajous curve trajectory shape based on the mathematical morphology theory is proposed,and an adaptive starting criterion is designed in combination with the probability distribution law of the zerosequence Lissajous curve area.A disturbance-resistant detection method for HIGFs in the noise scenario is presented.Finally,the effectiveness and reliability of the proposed method are verified through electromagnetic transient simulation cases and real fault tests in the distribution network.

关 键 词：配电网 高阻接地故障 电容投切 故障检测 李萨如曲线 数学形态学 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM73