基于卷积神经网络的主网继电保护在线整定方法  

Online Tuning Method of Main Grid Relay Protection Based on Convolutional Neural Network

作　　者：杨中哲 吕彦伯 陈佳 金王磊 YANG Zhongzhe;LIU Yanbo;CHEN Jia;JIN Wanglei(State Grid Shanghai Fengxian Power Supply Company,Shanghai 201499,China)

机构地区：[1]国网上海奉贤供电公司,上海201499

出　　处：《河南科技》2024年第16期13-16,共4页Henan Science and Technology

摘　　要：[目的]受主网故障状态的多样性和整定规则的适应性影响,继电保护的闭环阶跃响应振幅难以得到有效控制,为此,提出了基于卷积神经网络的主网继电保护在线整定方法。[方法]将主网中的同种保护功能涉及的定值变量作为一个集合,并构建主网继电保护在线整定数学模型。在开展具体的主网继电保护定值设置阶段,引入卷积神经网络,利用损失函数,计算在随机梯度下降机制下的最优正则化继电保护定值。[结果]测试结果表明,该方法测试的电网继电保护在闭环阶跃响应的振幅在50 s以内实现了快速收敛,且相较于对照组而言更加平稳。[结论]该方法在闭环阶跃响应方面取得了显著的优势,不仅提高了系统的收敛速度,而且改善了系统的振幅稳定性。有助于提升电网继电保护系统的运行效率和可靠性,具有实际的应用价值和推广潜力。[Purposes]Due to the diversity of fault states of the main grid and the adaptability of the set-ting rules,the closed-loop step response amplitude of the relay protection is difficult to be effectively controlled.Therefore,an online setting method for the relay protection of the main grid based on convolu-tional neural network is proposed.[Methods]The same protection function in the main grid is taken as a set of fixed value variables,and the online setting mathematical model of the main grid relay protection is constructed.In the specific setting stage of the main grid relay protection,convolutional neural network is introduced,and the loss function is used to calculate the optimal regularization relay protection setting under the stochastic gradient descent mechanism.[Findings]In the test results,the amplitude of the closed-loop step response of the test grid relay protection under the design method not only realized rapid convergence within 50s,but also was more stable than that of the control group.[Conclusions]It is shown that the design method has a significant advantage in the closed-loop step response,which not only improves the convergence speed of the system,but also improves the amplitude stability of the sys-tem,which is helpful to improve the operation efficiency and reliability of power grid relay protection sys-tem,and has the potential of practical application and popularization.

关 键 词：卷积神经网络 主网继电保护 在线整定 数学模型 定值设置 损失函数 随机梯度 最优正则化 

分 类 号：TP262[自动化与计算机技术—检测技术与自动化装置]