深度神经网络在风电功率预测中的应用研究

风电功率预测对于电网建设具有重要意义。文中提出一种基于深度神经网络的风电功率预测方法,该方法充分考虑了影响风电功率的若干因素,如风速、风向、空气密度和季节,通过深度神经网络训练、学习给出最佳的功率预测值。通过深度神经网络学习的特征能够更为有效地反映实际情况,因此提高了风电功率预测的稳健性。基于内蒙古某风电厂的实测数据进行了验证实验,结果表明了提出方法的有效性。     

高功率激光精密小能量测量系统研究

介绍了用于神光Ⅱ装置 8路功率平衡的全自动精密小能量测量系统 ,并用自动控制半波片衰减装置对其性能进行了测定。系统稳定性精度优于 1% (rms) ,量程可达三个量级范围     

Simulation of vertical merged MOS elements with optical power supply

Functional optoelectronic vertical merged MOS (OVMMOS) elements with optical power supply increasing the packaging density for advanced high-speed low-voltage low-power deep-submicron ULSI are considered. Two types of new OVVMOS logical elements are proposed, analyzed and simulated. The simple reduced but adequate numerical electrical-optical model for the OVMMOS is formulated. Low-voltage low-power OVMMOS with combined channels for electrons and holes to increase integration level are simulated using two-dimensional (2D)-numerical device simulators. The problems of low light power operations and optimizations of OVMMOS elements are investigated using 2D simulators.     

单电源型线性运放静态工作点的分析

讨论了在单电源条件下线性运放的输入输出传输曲线,重点分析了在单电源条件下的运放反相负反馈放大器的静态工作点,为单电源型线性运放工作点的设置提供了参考。     

网络连通性快速检测系统的实现

系统应用辅助CPU专一处理IEEE 802.1ag协议连通性检测消息报文的收发,实现了ms级的收发包,进行了链路的快速检测.采用两台设备模拟小型网络,验证了系统的功能及性能.     

X波段功率放大器设计

简要介绍了X波段100W固态功率放大器的设计过程,包括整机的设计框图、关键电路的设计仿真等,从功率管功耗的角度就设计过程中功率管的选择方法进行了详细探讨,并简要介绍了无过冲功率控制技术。     

FPGA and ASIC implementation of robust invisible binary image watermarking algorithm using connectivity preserving criteria

Digital watermarking is the process of hiding information into a digital signal to authenticate the contents of digital data. There are number of watermarking algorithm implemented in software and few in hardware. This paper discusses the implementation of robust invisible binary image watermarking algorithm in Field Programmable Gate Array (FPGA) and Application Specific Integrated Circuits (ASIC) using connectivity preserving criteria. The algorithm is processed in spatial domain. The algorithm is prototyped in (i) XILINX FPGA (ii) 130 nm ASIC. The algorithm is tested in Virtex-E (xcv50e-8-cs144) FPGA and implemented in an ASIC.     

30～512MHz,100W线性功率放大器极间匹配设计

设计了一种独特的极间匹配网络,使驱动放大器的输出阻抗直接匹配到末级放大器的输入阻抗,而不通过极间50Ω匹配转换。应用这种极间匹配网络,提高了30～512 MHz,100 W功率放大器的线性输出功率和效率,同时简化了匹配网络,减少了匹配元件,缩小了功率放大器的体积。这种极间匹配网络是通过集中L、C匹配网络与宽带同轴传输线变压器相结合实现的。应用ADS软件模拟以及计算集中L、C元件的值和同轴电缆的长度,使设计的极间匹配网络在近十个倍频程的频带内获得最佳性能。     

Low cost measurement system for broadcast power amplifiers

For the fast prototyping, production, and delivery of commercial radio frequency products/systems, accurate and reliable test systems are necessary. These systems are usually product customized and thus expensive solutions, capable of performing all necessary measurements for a specific product. The purpose of this paper is to present a flexible cost‐effective test solution, capable of realizing all necessary measurement on a high output power amplifier system greater than 500 W, and to generate essential reports. These reports allow the system operator to (i) perform an analysis and a statistical comparison among various products, assuring that the quality is the same for all products; and (ii) retain products that present a performance poorer than other similar products, without a rigorous technical analysis, thus increasing efficiency in factory assembly line. Copyright © 2013 John Wiley & Sons, Ltd.