电力线载波芯片ST7536在数据通信系统中的应用

电力线载波通信是用电力线路作为通信媒介进行数据传输。本文介绍了在低压配电线上用电力线载波专用芯片ST7536实现数据的传输,给出了应用实例,并详细说明了硬件和软件的实现方法。     

大数据背景下智能电网动态电力监控研究

本文针对我国电力使用过度集中造成的电力不稳定,供电压力骤增以及电力闲置造成电力浪费等主要问题,通过研究在大数据这一背景下如何有效实行智能电网动态电力监控,如何运用同步相量测量单元、高级计量架构等关键技术方法优化配用电网系统并提升电力供应的质量和可靠性,通过利用实时反馈的用电量及价格,控制消费者的用电量,将用电量控制在一个稳定的范围内,有效提高电网终端用电效率,平滑电网负荷曲线,降低电网负荷压力及电能损耗.     

MATLAB在电力系统三相短路故障分析中的应用

该文借助MATLAB功能搭建了电力系统模型并仿真了其三相短路故障,通过该软件对故障发生后所得数据波形的分析,从而说明了MATLAB在电力系统研究方面是一个有力的辅助工具,掌握其使用方法对电力系统研究具有重要的实际意义。     

基于多波段激光数据聚类的电力屏柜压板状态图像位姿解算方法北大核心CSCD

研究基于多波段激光数据聚类的电力屏柜压板状态图像位姿解算方法,提升电力屏柜压板状态图像位姿解算精度。利用激光传感器采集电力屏柜压板激光图像,采用自相关算法分类激光图像的多波段激光数据属性,利用多波段激光数据聚类方法对电力屏柜压板激光图像实施降维处理。从降维后的电力屏柜压板激光图像中,通过确定电力屏柜压板有效面积、有效尺寸以及有效形状,提取电力屏柜压板的形态特征。依据提取的电力屏柜压板形态特征,利用空间坐标变换关系,实现电力屏柜压板状态的位姿解算。实验结果表明,该方法可以利用电力屏柜压板激光图像的多波段激光数据聚类结果,精准解算电力屏柜压板状态,适用于变电站电力屏柜压板管理中。     

基于Encounter的低功耗时钟树综合研究

以基于Cadence CCOPT引擎设计时钟树为例,介绍了以降低时钟树功耗为主要目的,使用门控技术,以及选择合适缓冲器、反相器构建时钟树的方法。通过完成物理设计动态仿真和功耗分析的数据表明,在保证时序收敛的前提下,使用门控技术和选用不同缓冲器、反向器对整个时钟树的功耗及性能影响进行分析。实验结构表明,对使用门控技术芯片的功耗在不同的操作条件下,整个时钟树上的功耗节省约50%;适合使用缓冲器和方向器构建时钟树。同时,在使用达到相同驱动的能力缓冲器和反相器情况下,使用缓冲器的时钟树较使用反相器的时钟树节省30%。     

低压电力线扩频载波远程抄表系统的研究

介绍一种利用现有的普遍存在的低压电力网和公共电话网作为数据采集与传输通道 ,并应用扩频技术的低压电力线载波远程抄表系统的结构、工作原理、设计方案和实现方法等。该系统具有实施简单、使用面广等显著的特点 ,适合我国当前的国情 ,具有较高的实用价值和良好的应用前景。     

Bridging the gap between signal and power

Signal processing has been used in many different applications, including electric power systems. This is an important category, since a wide variety of digital measurements is available and data analysis is required to deliver diagnostic solutions and correlation with known behaviors. Measurements are taken at numerous locations, and the analysis of data applies to a variety of issues in ? power quality (PQ) and reliability ? power system and equipment diagnostics ? power system control ? power system protection. This article focuses on problems and issues related to PQ and power system diagnostics, in particular those where signal processing techniques are extremely important. PQ is a general term that describes the quality of voltage and current waveforms. PQ problems include all electric power problems or disturbances in the supply system that prevent end-user equipment from operating properly. Examples of voltage and current variations that can result in PQ problems include voltage interruptions, long- and short-duration voltage variations, steady-state research opportunities that use the measured voltages and currents to indicate possible equipment and system problems (referred to as equipment diagnostics).     

基于STM32的脉冲峰值功率测量核心设计

针对提高脉冲峰值功率的测量精度的目的,通过利用微波信号处理、信号峰值检波、信号采样和数据处理相关理论,以AD8318对数检波芯片和AD9238高速A/D芯片为核心,以STM32为计算显示平台,构成脉冲峰值功率测量的设计方案,并通过标准功率源进行了测试,试验证明该方案设计的脉冲峰值功率仪实现了对脉冲峰值功率的准确测量。     

基于可重构MUXs网络的低功耗测试数据压缩方法

测试数据和测试功耗是集成电路测试时关注的两个主要问题.为缩减测试数据体积和降低测试功耗,提出了一种基于可重构MUXs网络的低功耗测试数据压缩方法.这种方法在保持压缩率不变的前提下,充分利用MUXs网络中"空闲"的测试通道来降低测试功耗.在降低测试功耗原则的指导下,将一些"有用"的测试通道进行拆分,即将这些"有用"通道驱...     

基于区块链的智能电网监控

随着智能电网系统的广泛应用,电力公司可以通过网络获取实时用电数据以满足负荷预测以及电力营销等业务需求,电力用户也可及时得知当月电费,甚至了解何时用电量较大以及哪个电器耗电量最大等具体细节,但这也导致了数据泄露的风险。为此文中利用主权区块链技术和智能合约的实施,为电力公司和电力用户之间提供一个可信任系统,使得电力供需双方都能安全、透明地获取用电数据。     

Joint Transmitter Power Control and Mobile Cache Management in Wireless Computing

We investigate efficient schemes for data communication from a server (base station and access point) to a mobile terminal over a wireless channel of randomly fluctuating quality. The terminal user generates requests for data items. If the buffer (cache) of the terminal contains the requested data, no access delay/latency is incurred. If not, the data is downloaded from the server, and until becoming available locally at the terminal, the user incurs a delay cost. Moreover, a transmission/power cost is incurred to transmit the data over the wireless link at a dynamically selected power level. To lower both the access delay and transmission costs, the system may prefetch data predictively and cache them on the terminal (especially during high-link-quality periods), anticipating future user requests. The goal is to jointly minimize the overall latency and power costs by dynamically choosing what data to (pre)fetch, what power level to use, and when to use it. We develop a modeling framework (based on dynamic programming and controlled Markov chains) that captures essential performance trade-offs. It allows for the computation of optimal decisions regarding what data to (pre)fetch and what power levels to use. To cope with emerging complexities, we then design efficient online heuristics whose simulation analysis demonstrates substantial performance gains over standard approaches.     

低成本红外目标源远程投放控制器设计

针对空空导弹飞行试验地面靶试的需求,提出一种基于GSM通讯网络的远程红外目标源投放控制器设计方案,采用单片机实现GSM模块的传输控制以及控制命令的解析执行,通过华为GTM900模块实现数据的无线传输,此系统具有低功耗、通讯可靠、成本低的优势。     

Measurements of Interference Levels in the UHF Band from Aircraft Altitudes

To help fill the need for environmental data essential to the design of reliable space-communications systems, a swept super-heterodyne radio-frequency interference receiver was developed for flight on the Lincoln Laboratory LES-5 and LES-6 experimental- communication satellites. The LES-6 receiver was adapted for use on an Air Force KC-135 aircraft. The receiver was designed to measure average power and peak power in the bands from 233 to 258 MHz and from 290 to 315 MHz. The aircraft was flown on a world-wide data collection mission during February and March 1967. The data were collected from an altitude of 30 000 feet. A compilation of the data collected on this flight is presented in graphical form.     

Maximizing the data transmission rate of a cooperative relay system in an underwater acoustic channel

In this paper, we investigate the problem of maximizing the data transmission rate of a cooperative relay system in an underwater acoustic communication channel. With amplify‐and‐forward relaying and adaptive source transmission, we present optimal transmit signal power adaptation policies that maximize the data transmission rate, considering both frequency and time domains. The analysis takes into account a physical model of acoustic path loss and ambient noise power spectral density. Typical characteristics of underwater channel such as frequency‐dependent fading and time variations are also considered. Capacity bounds for channel state information (CSI) only at the receiver and CSI at both transmitter and receiver are presented. To maximize the data rate, we use the notion of an optimal bandwidth which corresponds to efficient allocation of signal power across the transmission bandwidth. Under the constraint of an average transmit power, the optimal transmit power adaptation policy is found to be ‘water‐pouring’ in frequency‐time domain, while the transmit power adaptation policy with a total power constraint is ‘water‐pouring’ in frequency domain. Results show that both frequency domain and frequency‐time domain power adaptation schemes provide much greater improvement in average data rate over that of the constant power case. Copyright © 2011 John Wiley & Sons, Ltd.     

疫情下的数据利用和个人信息保护再权衡

在新冠肺炎疫情抗击中,大数据的利用为抗击疫情提供了有力武器,同时也凸显了在公共突发事件下如何权衡公共需要与个人信息保护这一重要问题。目前我国已经基本建立了公共突发事件下的信息利用规则,赋予政府部门广泛的信息收集、利用职责,但相关规则与个人信息保护制度的协调性不足。建议加强对公共突发事件下的数据利用与个人信息保护再权衡,细化相关场景下的数据利用具体规则。     

基于灰色建模理论的平台漂移数据预处理

为更好利用平稳时间序列建模法对陀螺随机漂移数据建模,该文将灰色建模理论应用到陀螺漂移数据趋势项提取中,分别用GM(1,1)提取幂函数项和用GM(2,1)模型提取周期函数项,建模的结果表明,陀螺漂移数据中含有的幂函数项可忽略,在去除周期函数和线性趋势项后对数据进行正态检验表明,经过预处理的数据符合平稳时间序列的要求,可利用平稳时间序列理论进行建模。     

低压电力线通讯网络技术发展的研究

高压电力线载波通信已有近百年的历史,它在电力调度话音通信、电力系统远动装置数据采集等方面取得了卓有成效的应用,但是利用一个台区的低压电力线建立Internet接入网是近几年来国际上刚刚兴起的技术。本文论述的电力线通信(Power Line Communications)计算机网络(以下简称PLC网络)是以电力线为通信介质实现数据传输或建立计算机网络的相关技术研究。由于低压电力线的普及程度比其他任何通信介质都广泛,研究电力线作为信息传输介质在技术和经济方面都有十分重要的意义。     

不同系统的相互连接和数据共享

基于解决国家电网渭南供电局在调度自动化系统升级改造工作过程中,遇到的不同厂家不同系统之间的连接和数据信息共享的问题。经过讨论研究,其采用调度数据网部分设备作为硬件支持,在烟台东方电子和国电南瑞科技两厂家技术人员提供软件支持的条件下,解决了该问题。在渭南供电局电力调度中心,这两个系统已经过验收并投入运行。通过进一年来的使用,完全实现了不同厂家、不同系统的数据共享和交换。对此类问题的解决具有普遍意义。     

基于雾计算的智能电表用户虚拟环隐私保护方案

作为智能电网的基础组件,智能电表(SMS)可以定期向电力公司报告用户的详细用电量数据。但是智能电表也带来了一些安全问题,比如用户隐私泄露。该文提出了一种基于虚拟环的隐私保护方案,可以提供用电数据和用户身份的隐私,使攻击者无法知道匹配电力数据与用户身份的关系。在所提方案中,智能电表可以利用其虚拟环成员身份对其真实身份进行匿名化,并利用非对称加密和Paillier同态系统对其获得的用电量数据生成密文数据;然后智能电表将密文数据发送给其连接的雾节点,雾节点定期采集其管理的智能电表的密文数据。同时,雾节点对这些智能电表的虚拟环身份进行验证,然后将收集到的密文数据聚合并发送给控制中心;最后控制中心对聚合后的密文进行解密,得到用电量数据。实验结果表明所提方案在计算和通信成本上具有一定的优势。     

Antenna phase pattern measurements at millimeter wave frequencies using the differential phase method with only one power meter

The differential phase measurement method has been improved to need the use of only one power meter instead of three power meters. This enables accurate antenna phase pattern measurements with a simplified set-up, accompanied by the reduction in cost. All advantages of the differential phase measurement method are still also available, e.g. there is no need to phase lock oscillators or to use rotary joints. The measurement results for an antenna at 110 GHz are presented. A good agreement with earlier data was obtained.