遗传神经网络的瞬变电磁视电阻率求解算法

发布时间：2018-01-04 21:08

本文关键词：遗传神经网络的瞬变电磁视电阻率求解算法　出处：《电工技术学报》2017年12期 　论文类型：期刊论文

【摘要】：提出用遗传神经网络求解中心回线装置下瞬变电磁法(TEM)的视电阻率。根据中心回线方式的瞬变电磁响应关系式,设计出神经网络的输入输出关系和单输入单输出的三层网络结构。计算出神经网络的输入输出样本集,并通过尝试法确定隐含层的神经元个数。引入遗传算法优化神经网络结构的连接权值,得到了最优连接权值的GABP神经网络。用该神经网络对瞬变电磁响应的非线性方程进行拟合,得到以实测数据计算的核函数值所一一对应的瞬变场参数值,达到求视电阻率并成像的目的。通过对地下高阻块状异常体模型和电力系统钢制扁钢材料的接地网模型两个实例模型的仿真计算证明,得到视电阻率断面图,达到了求解反问题的效果。理论模型与实际数据计算表明,遗传优化的BP神经网络使得瞬变电磁视电阻率的计算时间大大缩短,是个实用的算法。该方法为瞬变电磁接地网故障实时诊断平台提供必要的技术基础。
[Abstract]:This paper presents a genetic neural network to solve the central loop transient electromagnetic method (TEM). According to the apparent resistivity of central loop transient electromagnetic response relationship, designed the relationship between input and output of the neural network and the network structure of three layers of single input single output. Calculate the input and output data of neural network, and the number of neurons in hidden layer are determined by test method. Introducing the connection weights to optimize the structure of neural network genetic algorithm, the optimal GABP neural network connection weights. With the nonlinear equations of electromagnetic response of the neural network in the transient of fitting, nuclear function value of measured data in calculating the corresponding transient field the parameter values, to find and resistivity imaging. Through the simulation of underground high resistance abnormal body block grounding model and power system of steel flat steel material two examples of calculation model That get the apparent resistivity section, which achieves the effect for solving the inverse problem. The calculation shows that the theoretical model and actual data, the calculation time of BP neural network genetic algorithm makes the transient electromagnetic apparent resistivity is greatly shortened, is a practical algorithm. The method provides a necessary technical basis for electromagnetic grounding of real time fault diagnosis platform for transient variable.

【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);国网重庆电力公司电力科学研究院;
【基金】：国家自然科学基金项目(51277189) 输配电装备及系统安全与新技术国家重点实验室自主研究重点项目(2007DA10512714103) 国家电网公司总部科技项目(基于瞬变电磁法的接地网状态检测及故障诊断新技术研究)资助
【分类号】：P631.325;TP183
【正文快照】： 0引言瞬变电磁是一种基于发射脉冲电流迅速关断,接收二次感应电压的电磁探测方法,该方法是把具有一定特征的发射源作用在探测目标体上,并测量目标体感应出的二次场信号,以此计算得到被探测目标的电阻率分布和大概位置。Ward S H和Hohmann G W从环形发射线框的中心接收方式(中

【相似文献】