基于多模式分解和多支路并行残差网络的特高压三端混合直流输电线路故障区域诊断  

Fault zone diagnosis of three-terminal hybrid UHVDC transmission lines based on multi-mode decomposition and multi-branch parallel residual network

作　　者：陈仕龙[1] 李国辉 毕贵红[1] 鲍童语 张梓睿 罗灵琳[1] CHEN Shilong;LI Guohui;BI Guihong;BAO Tongyu;ZHANG Zirui;LUO Linglin(School of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500

出　　处：《电力自动化设备》2024年第10期140-147,178,共9页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(52067009)。

摘　　要：特高压三端混合直流输电线路发生接地故障时,故障电气量变化存在很强的随机性和非线性,在噪声干扰下其规律性更弱,很难快速、准确地提取故障特征以诊断故障区域。鉴于此,提出一种集电流波形特征提取和故障区域诊断为一体的诊断模型。分析不同区域故障时的电流波形特点,利用数学机理不同的3种算法同时分解故障电流,避免一些容易混叠的模态子序列在单一分解方法中逃逸。利用多支路并行残差网络迅速地挖掘分解分量的多尺度空间耦合交互特征,并结合门控循环单元网络模块,进一步提取故障电流的时间耦合特征,使得特征得到显著增强。利用麻雀搜索算法优化该模型的关键参数,构建充分适应电网故障诊断的网络结构,实现故障区域的快速诊断。仿真结果表明,该方案有着较高的灵敏性、较强的抗干扰能力,满足直流保护的可靠性和速动性要求。The randomness and non-linearity of fault electrical signals variations in the event of earth fault on a three-terminal hybrid ultra high voltage direct current(UHVDC)transmission line.The regularity of fault electrical signals is even weaker under noise interference,making it difficult to extract fault characte-ristics quickly and accurately and therefore making diagnosis of fault areas difficult.As a result,a diagnosis model that integrates current waveform feature extraction and fault zone diagnosis is proposed.The charac⁃teristics of the current waveforms during faults in different areas are analyzed.The fault currents are de⁃composed by using three algorithms with different mathematical mechanisms,which prevents some modal subsequences that are prone to confounding from escaping in a single decomposition method.The multi-branch parallel residual network is then used to rapidly mine the multi-scale spatially coordinated interac⁃tive features of the decomposition components,in combination with the gated recurrent units module,to fur⁃ther extract the temporal characteristics of the fault currents,which enhances the deep features significantly.The key parameters in this model are optimized with sparrow search algorithm.By applying these steps,a network structure fully adapted to power grid fault diagnosis is constructed and the fault areas are quickly diagnosed.The simulative results show that the scheme has high sensitivity,strong anti-interference ability,and meets the requirements of reliability and quickness.

关 键 词：特高压三端混合直流 波形特征 故障区域诊断 信号分解技术 深度学习 

分 类 号：TM77[电气工程—电力系统及自动化]