共查询到20条相似文献,搜索用时 156 毫秒
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《电力学报》2021,(2)
变电站绝缘子因其表面极易受潮湿天气的影响出现污秽导致变电设施发生闪络事故,这直接关系到变电站供电的稳定性。因此,有必要研发带电作业机器人实现对支柱绝缘子的清洗,保障电力系统稳定运行。设计了基于双目视觉的绝缘子清洗机器人,完成了双目视觉系统对目标绝缘子的识别与定位。使用YOLOv4-tiny深度学习网络算法对支柱绝缘子与法兰目标进行识别检测,检测准确率达92.29%。基于立体匹配对摄像机采集图像中的目标物体上的点对进行搜索,获取目标绝缘子深度信息并对绝缘子目标点进行三维重建。实验结果显示,目标点的平均深度误差为0.73 cm,精度满足机械臂抓取需要。针对后续机械臂的夹持清洗任务,建立绝缘子视觉观测模型,获取相机观测角,通过ROI区域对绝缘子盘轮廓进行提取,利用最小二乘法对绝缘子伞裙边进行椭圆拟合,对绝缘子伞裙边缘信息检测,可实现对机械臂末端干冰喷头倾角调整,进而完成对绝缘子盘凹壑进行精准清洗。 相似文献
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现有非侵入式负载监测技术处理负载规模变化的能力弱,且随着负载的种类复杂化与数量的增多,其具有估计精度不高的问题。建立了一种考虑用户用能多时间尺度耦合特性,并具有规模化处理能力的新型卷积神经网络,以提高复杂规模化负载估计的精确性。该神经网络包括多时间尺度感知与特征提取模块、自我关注模块和对抗损失模块等,多时间尺度感知与特征提取模块可获取与整合不同时间尺度负载数据的耦合特征,自我关注模块和对抗损失模块根据耦合特性来进一步提高监测模型的估计精度。最后,通过仿真分析验证了所提方法的有效性和优越性。 相似文献
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基于门控循环单元网络与模型融合的负荷聚合体预测方法 总被引:1,自引:0,他引:1
随着智能电表的普及,以智能电表数据为基础,可按需求灵活划分不同规模的负荷聚合体并开展预测。由于负荷聚合体规模差异较大,并与用户负荷特性关系密切,传统预测方法不再适用。为此,提出了一种基于门控循环单元(GRU)网络与模型融合的负荷聚合体预测方法。首先,通过分布式谱聚类算法获得负荷特性相近的负荷群体,然后进行分组预测,采用GRU作为元模型,对时间序列进行动态建模,利用随机森林算法融合多个结构不同的GRU网络,实现对负荷群体的预测,最终将各群体预测值求和得到负荷聚合体预测值。算例表明,得益于分组预测、动态时间建模及模型融合技术,所述方法能充分利用不同模型的结构优势,发现时间序列动态规律,在不同时间尺度下预测精度更高,对不同规模的负荷聚合体适用性更强。 相似文献
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On-Chip Characterization of Single-Event Transient Pulsewidths 总被引:1,自引:0,他引:1
Narasimham B. Ramachandran V. Bhuva B. L. Schrimpf R. D. Witulski A. F. Holman W. T. Massengill L. W. Black J. D. Robinson W. H. McMorrow D. 《Device and Materials Reliability, IEEE Transactions on》2006,6(4):542-549
A new on-chip single-event transient (SET) test structure has been developed to autonomously characterize the widths of random SET pulses. Simulation results show measurement granularity of 900 ps for a 1.5 mum technology and also indicate that the measurement granularity rapidly scales down with technology. Laser tests were used to demonstrate circuit operation on test chips fabricated using a 1.5 mum process. The experimental results indicate pulsewidths varying from about 900 ps to over 3 ns as the laser energy was increased 相似文献
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Some fundamental constraints on the performance of micromotor technology have been discussed. Several aspects of performance were explored, including energy density, force density, size, constraints on motor-drive circuitry, motor topologies, and friction. Analysis shows that electrostatic machines have advantages as microfabrication processes achieve finer resolution, and, in fact, can exceed the energy and force density capabilities of conventional magnetic machines at small enough scales. Major thrusts for electric drive theory to be applied are in control, topology optimization, and machine testing. 相似文献
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作为能源技术与互联网信息技术相融合的产物,能源互联网的构建离不开大型数据服务中心互联的支撑。然而,当前互联网数据中心(Internet Data Center,IDC)巨大能耗所带来的成本和环境压力,突显出对IDC能耗管理的重要性。文中基于实时电价和多电力市场构成的能源互联网市场环境,在考虑IDC散热成本、碳排放成本以及服务延迟约束的基础上,以IDC负荷周期内总的能耗成本最小化为目标,建立了IDC数据负荷在多时空尺度下的优化调度模型,并采用反馈分支定界算法对模型求解。最后,通过算例仿真验证所提方案的正确性,仿真结果表明该技术可以显著降低IDC的能耗成本。 相似文献
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《Dielectrics and Electrical Insulation, IEEE Transactions on》2000,7(5):693-704
The feasibility of using electrokinetic phenomena for contaminant removal from low-permeability porous media is investigated by laboratory experiments and theoretical modeling. The main processes by which contaminant transport takes place under a dc electric field in soil are electromigration, electro-osmosis and electrophoresis. They are particularly effective in fine-grained soils, which is not the case for pressure-driven flushing. Meanwhile, although the results of various studies on a laboratory scale suggest that electrokinetics is a promising technology for water soluble contaminant removal, further research is needed at both laboratory and field scales in order to determine the effectiveness of this technology in situ and in the case of non-soluble organic matter such as heavy hydrocarbons. First, this paper describes the electrochemical processes occurring in soil under an electric field. Then the electro-osmosis phenomenon is more particularly investigated in a theoretical and experimental way. Furthermore, the main previous work on the subject is summarized, and experiments conducted in the laboratory on decontamination by electric field of clay samples polluted by motor oil, are presented 相似文献