排序方式: 共有15条查询结果,搜索用时 234 毫秒
1.
The implementation of a pattern recognizer for power system diagnosis can provide great advancement in the protection field. The work reported in this paper demonstrates the use of an Artificial Neural Network (ANN) as a pattern classifier for differential relay operation in the protection scheme for power transformer protection. The proposed relay takes care of maloperation due to inrush current, overexcitation, and ensures operation during internal fault. The off-line experimental result presented in this paper shows that a FeedForward Neural Network (FFNN) can be considered as an attractive alternative method to make the discrimination among normal, magnetizing inrush, overexcitation, and internal fault currents in a digital relay implementation. Results showing the performance of the protection scheme indicate that it is fast and reliable. 相似文献
2.
3.
4.
This paper presents results from the implementation and testing of a PC based monitoring and fault identification scheme for a three-phase induction motor using artificial neural networks (ANNs). To accomplish the task, a hardware system is designed and built to acquire three-phase voltages and currents from a 1/3 HP squirrel-cage, three-phase induction motor. A software program is written to read the voltages and currents, which are first used to train a feed-forward neural network structure using the JavaNNS program. The trained network is placed in a LabVIEW based program formula node that monitors the voltages and currents online and displays the fault conditions and turns the motor off. The complete system is successfully tested in real time by creating different faults on the motor. 相似文献
5.
微控制器温室环境温湿度程序控制系统的研究与设计 总被引:5,自引:0,他引:5
针对温室环境温湿度程序控制的应用需要,研制了一种使用微控制器的温湿度程序控制系统。该系统硬件使用数字式温湿度一体化传感器、固态继电器和微控制器,它可以把一段时间内的温室环境设定温湿度值存储在微控制器中,用于控制温室内的温湿度,无须操作人员干预,实现自动化控制。系统具有硬件结构可靠、安装简单、成本低廉、使用和维修方便的特点。 相似文献
6.
刘刚 《四川建材学院学报》2012,(3):78-83
提出了一种基于MIMO-OFDM协作系统的多中继混合选择合并算法。算法原理主要是采用地理位置信息得到一个性能最优的AF(放大转发中继)中继节点,根据瞬时信噪比门限值或相对最小BER门限值选择符合要求的多个DF(译码转发中继)中继,所选择出来的最优AF中继和多个DF中继将协作MIMO-OFDM系统完成信号的转发,最后在目的节点处对直传链路信号和中继链路信号进行最大比合并(MRC)。对该算法进行了理论分析,并研究了该算法对系统误比特率性能的影响,并在MATLAB上进行链路级仿真分析比较。仿真结果表明所提出的多中继混合选择合并算法能有效提高空间分集增益,从而降低系统误比特率。 相似文献
7.
依据继电器测控技术特点和试验参数,介绍了基于台湾研华610型工控机和NI PCI7811R采集板的继电器电寿命检测控制系统的设计思想。采用图形化编程语言LabVIEW,完成FPGA数据采集软件设计,实现主机数据分析处理。应用结果表明,检测控制系统稳定可靠。 相似文献
8.
9.
通信过程产生的能耗问题日益严峻。绿色通信作为一个全新的理念,旨在确保网络性能(如容量等)的同时尽可能降低能耗。在新一代的无线通信网络中,协作中继作为一项候选技术,能够有效提升网络容量和能效。文章在热点区域内研究以能效最大化为目标的最优中继位置问题。仿真结果表明,能够通过优化中继位置获得最大能效,并通过与无中继网络进行性能对比,表明文章提出的策略能够有效提高上行传输能效。 相似文献
10.