特高压直流(ultra hight voltage direct current,UHV DC)系统控保装置的可靠性对电力系统的安全稳定运行至关重要。目前特高压直流线路保护存在可靠性不高的问题,准确迅速地评价特高压直流线路保护的动作行为,对于提高电力系统的安全...特高压直流(ultra hight voltage direct current,UHV DC)系统控保装置的可靠性对电力系统的安全稳定运行至关重要。目前特高压直流线路保护存在可靠性不高的问题,准确迅速地评价特高压直流线路保护的动作行为,对于提高电力系统的安全稳定运行具有重要意义。提出了一种利用卷积神经网络对特高压直流线路保护动作行为进行评价的方法,首先分析了影响线路保护动作行为的因素;然后构建了评价线路保护动作行为的卷积神经网络结构,开展了基于PSCAD(power systems computer aided design)的直流线路保护动作行为仿真,生成了卷积神经网络的训练和测试样本集,再利用训练样本集对评价保护动作的卷积神经网络进行训练;最后对该网络进行了测试,测试结果表明,该方法可以正确评价特高压直流线路保护的动作行为,通过与传统人工网络的评价结果的对比可知,该方法具有速度快、错误率低、学习能力强等优点。展开更多
Cliff deformation behavior after conservation is of great significance for evaluating the conservation effect and discovering the dynamical law of soil. Modeling on deformation behavior is beneficial to the quantitati...Cliff deformation behavior after conservation is of great significance for evaluating the conservation effect and discovering the dynamical law of soil. Modeling on deformation behavior is beneficial to the quantitative evaluation of interactions between soil mass and structures as well as the forecast. Based on cliff conservation engineering of Jiaohe Ruins （the largest raw soil heritage site in the world）, data of horizontal deformation of the upper cliff were obtained by using Nanrui-made NDW-50 displacement device （precision： 0.01 mm, frequency： 15 min^-l）. Regression analysis indicates that deformation behavior models include exponential growth, linear growth and parabolic growth types, while daily deformation presents more intense periodicity （24 h）. The deformation is less than 1.5 mm during monitoring period, which has no impact on the stability of cliff. Deformation behavior provides the mutual duress and interaction between soil and engineering intervention. In addition, deformation mode attaches tensely to the damage pattern of the cliff. The conclusions are of importance to the stability evaluation of the carrier along Silk Road.展开更多
文摘特高压直流(ultra hight voltage direct current,UHV DC)系统控保装置的可靠性对电力系统的安全稳定运行至关重要。目前特高压直流线路保护存在可靠性不高的问题,准确迅速地评价特高压直流线路保护的动作行为,对于提高电力系统的安全稳定运行具有重要意义。提出了一种利用卷积神经网络对特高压直流线路保护动作行为进行评价的方法,首先分析了影响线路保护动作行为的因素;然后构建了评价线路保护动作行为的卷积神经网络结构,开展了基于PSCAD(power systems computer aided design)的直流线路保护动作行为仿真,生成了卷积神经网络的训练和测试样本集,再利用训练样本集对评价保护动作的卷积神经网络进行训练;最后对该网络进行了测试,测试结果表明,该方法可以正确评价特高压直流线路保护的动作行为,通过与传统人工网络的评价结果的对比可知,该方法具有速度快、错误率低、学习能力强等优点。
基金Project(2010BAK67B16) supported by the National Science and Technology Pillar Program during the 11th Five-Year Plan Period of China
文摘Cliff deformation behavior after conservation is of great significance for evaluating the conservation effect and discovering the dynamical law of soil. Modeling on deformation behavior is beneficial to the quantitative evaluation of interactions between soil mass and structures as well as the forecast. Based on cliff conservation engineering of Jiaohe Ruins （the largest raw soil heritage site in the world）, data of horizontal deformation of the upper cliff were obtained by using Nanrui-made NDW-50 displacement device （precision： 0.01 mm, frequency： 15 min^-l）. Regression analysis indicates that deformation behavior models include exponential growth, linear growth and parabolic growth types, while daily deformation presents more intense periodicity （24 h）. The deformation is less than 1.5 mm during monitoring period, which has no impact on the stability of cliff. Deformation behavior provides the mutual duress and interaction between soil and engineering intervention. In addition, deformation mode attaches tensely to the damage pattern of the cliff. The conclusions are of importance to the stability evaluation of the carrier along Silk Road.
