低压电器最新发展动向

分析了电力断路器、控制电器、终端电器、电涌保护器等低压电器的发展动向,介绍了母排连接与安装一体技术及总线技术在低压电器领域的应用与发展.指出了智能化、高性能、小体积、高可靠性、选用绿色环保材料是当前低压电器的发展方向.更多高新技术的嵌入,既提高了低压电器产品的整体性能,又衍生出一些高度集成的新型低压电器产品.     

低压电器最新发展动向(续)

分析了电力断路器、控制电器、终端电器、电涌保护器等低压电器的发展动向,介绍了母排连接与安装一体技术及总线技术在低压电器领域的应用与发展。指出了智能化、高性能、小体积、高可靠性、选用绿色环保材料是当前低压电器的发展方向,更多高新技术的嵌入,既提高了低压电器产品的整体性能,又衍生出一些高度集成的新型低压电器产品。     

电动汽车的电气驱动技术及其发展

由于电动汽车在节能和环保方面的巨大优越性，将使其成为２１世纪重要的城市地面交通工具，本文综述了电动汽车关键技术－－电气驱动技术的现状和发展趋势。着重讨论了电机及快速发展中的电力电子和控制技术及其对电动汽车的重大影响。     

电能计量在线监测系统应用实例及分析

通过简要介绍目前电能计量检定的实际生产水平和发展趋势,引出电能计量在线监测系统;进一步介绍了电能计量在线监测系统的组成和关键技术;详细介绍了电能计量在线监测系统主要功能的实现原理。通过数据收集,介绍了电能计量在线监测系统在110 kV龙台变电站的应用实例。     

滑动电接触设计现状与发展动态

笔者论述了高(中)压开关设备的滑动电接触的演变经历和发展趋势,指出采用新近发展的弹簧触头及其电镀碳银技术,将使其更加完善和稳定可靠。     

神经元PID直流伺服系统

神经网络技术是电机控制方法发展方向之一,本文在介绍一套神经元PID自适应直流伺服系统的基础上,对神经元控制的基本性能进行了探讨.实验证明将神经元理论用于PID控制系统中增强了系统的鲁棒性.     

Electric vehicle integration into power systems

Sales of electric vehicle are rapidly growing worldwide. Vehicle grid integration is important for mitigating impact of charging demand on the distribution feeders, realizing renewable powered charging from the rooftop photovoltaic and wind power generation, and contributing to the Vehicle‐to‐Grid ancillary services for the power systems. This article reviews current trends of the vehicle grid integration R&D. Future prospective is also pointed out on the key issues such as an electrical interface, multiple services integration, and the electric vehicle living demonstration for open innovation.     

电力系统视频监控中目标检测与跟踪算法研究

对变电站电力设备进行全天候实时监测是电力系统安全防范的有效手段。根据视频监控技术的原理和特点,介绍了视频监控系统中的两大关键技术---运动目标检测和跟踪技术,并对运动目标检测和跟踪技术中常用的算法进行了探讨。介绍了运动目标检测与跟踪算法的基本原理,分析了算法的特点以及存在的问题,选取了适用于电力系统的目标检测与跟踪算法。最后,设计了电力系统视频监控的基本模式,并对电力系统视频监控的实际运行系统及发展趋势进行了详细的分析。     

自适应技术在油田供配电线路保护整定计算中的应用

根据大庆电网的实际情况,对供配电线路整定计算的自适应技术进行研究,提出了供配电线保护的自适应整定算法以及扰动域思想,并在此基础上对传统三段式电流保护进行改造得到自适应三段式电流保护。通过单电源回线算例分析表明,自适应三段式电流保护大大提高了供配线路电流保护的保护范围,从而提高保护的选择性、速动性与灵敏性,使得线路保护的可靠性进一步提高。     

现代建筑电气技术的发展与探索

分析了现代建筑电气技术形成的过程及其技术内涵,指出建筑电气技术综合应用了电工、电子、控制与信息技术,已成为电气工程领域的重要分支.现代建筑电气技术不仅拥有广阔的市场,而且已构成稳定的产业链,并将在智能化、数字化与绿色化的发展过程中达到新的高度.     

高压电能计量设备及其检验技术

为更全面地把握高压电能计量技术进步发展脉络,助力新型高压电能计量设备推广应用,文章较系统地梳理了传统以及新型高压电能计量设备的构建原理、实现方案、功能特点及适用范围,且以高压电能表为代表,重点阐述了新型高压电能计量设备的工作原理和技术优势,以及与高压电能计量设备相互促进、不断进步的高压电能计量技术的新变化、新特点及新优势。还总结了高压电能计量设备的各类检验技术,包括综合误差评价、整体检验以及现场/在线检验等;论述了发展高压电能计量设备整体检验技术的必要性,并梳理了相应检验装置的构成、工作原理和技术特点。展望了高压电能计量设备及其检验技术的发展趋势。     

Improving the reliability of electric drives of exhausters of the oxygen-converter process

This paper deals with increasing the reliability of electric drives of exhausters of the oxygen-converter process. The dependences of the reliability parameters in the electrical converter–electric motor system on the power reserve were obtained. The costs for the installed equipment were taken as an optimization criterion. It is noted that improving the reliability of an electric drive is possible both by increasing the overall power of the power unit and by changing the number of phases. It is shown that the reliability of the system can be improved in a synchronous electric drive with pulse-vector control at the reservation of a semiconductor converter. A mathematical model of the electrical converter–reluctance motor with a field-regulated machine complex is proposed. The results of the mathematical modeling of the synchronous electric drive with pulse-vector control are considered. The dependence of the specific electric parameters on the number of phases is determined.     

智能低压电器最新发展方向

现场总线等大量的新技术被嵌入到低压电器产品中,这些新技术将引领低压电器今后一段时期的发展潮流.     

A vision of an electric power architecture for the next generation

Since the present hierarchical power grid structure and AC interface are mature and rigid, a new electric power system architecture is proposed here to save the earth by making use of renewable energy sources. The architecture consists of a new concept and a historical technology, that is, a network of many “electric clusters” with a DC interface. The cluster includes dispersed electric power generators, electric appliances, electric storage, and “electric power routers.” The router is equipment to resourcefully route electrical energy between neighboring clusters and to manage electrical energy in the cluster. The transfers of electrical energy (between clusters and within clusters) and the generation of electricity from renewal energy sources (such as sunlight, wind, tides, and biogas) are intermittent and have very wide dynamic ranges, so that the interface must make use of DC. When we achieve an energy society with this architecture, we will be able to reduce energy consumption, greenhouse gas emissions, and materials use. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(1): 18–25, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20039     

电能替代行业现状分析与建议

我国正处于经济快速发展的关键时期,源源不断的能源生产和消费必不可少。积极推进电能替代,对于促进工业现代化发展、提高能源利用率、减少环境污染、缓解能源安全问题具有重要的意义。各地区实施电能替代主要集中在电动汽车、电采暖、电锅炉、港口岸电等领域。首先梳理了一系列推进电能替代的政策,分析整理了电能替代在各地区的消费供应,以及在交通领域、工农业生产领域、居民采暖与其他五大领域的发展状况。据此分析电能替代各技术的占比情况以及各地区电能替代的完成情况,挖掘电能替代潜力,并根据目前存在的问题提出建议。     

Investigation of an electrical complex using specialized modules in the MATLAB environment

Modules for calculating and increasing power factor and efficiency, which characterizes efficient energy use, as well as coefficients of voltage nonsinusoidality and current distortion, which characterizing the quality of electricity, and a reversible module of total power and its active and reactive components, are proposed for implementation in the MATLAB environment. By means of the proposed modules, an investigation of electrical complex with the ability to discharge electrical networks and maintain consumed voltage at a given level was performed. The measurement modules are constructed on elements taken from the Library Browser and are compatible with MATLAB. Block structures were examined in order to calculate the energy efficiency of the complex. The process of energy exchange via a direct-current link between the electric drives was analyzed. One of the drives operated as an energy consumer, while the other operated as a generator; herewith, the energy consumption of the electric drives decreased. The use of voltage boosters with a directcurrent link based on static converters of electric energy allows the energy efficiency of the electrical complex to be increased significantly.     

山东电网新一代电能量计量系统研究与应用

为了满足电网商业化运行中电能量统计、结算和考核要求,山东电力调度中心建设了新一代电能量计量系统。该系统全面支持IEC61970标准,采用了计量点和统计模型全生命周期管理等先进技术,实现了电能量数据与电网实时运行数据的分析比对,提高了电能量数据的准确性和实用性,大大减少了维护工作量。该系统的有效性、实用性和可靠性已经得到了实际应用的验证。完全能够替代国外系统,可以完成电能量数据采集、处理、存储、统计结算与信息交换的任务。     

Determination of the streamers characteristics propagating in liquids using the electrical network computation

This work is devoted to the modeling of branching streamers propagating in transformer oil using an equivalent electrical network and the electrical network computation. The proposed model enables one to determine the different characteristics of the streamer (i.e., the associated current and the electrical charge, the power and the energy injected in the liquid, the local electric field at the streamer head, the streamer shape and its velocity, the mobility of the charge carriers within the streamer channels, the local viscosity and temperature). It's shown through the simulated values of the mobility of charge carriers, the local viscosity and temperature that both electronic and gaseous mechanisms are implicated in the streamer development. The gaseous nature of streamers and the role of the local electric field are evident. The influence of the conductivity and additives as well as the electrode gap on the propagation velocity of positive streamers is analyzed.     

考虑接地导体时500kV开关场内的工频电场

为了深入研究变电站内工频电场在有无考虑站内电气设备接地体影响时的分布情况,推导了计算开关场内工频电场的三维模拟电荷法,以500 k V变电站为例,对变电站500 k V开关场及各类电气设备的接地体进行模型建立与工频电场分布的计算分析。首先,通过仿真结果与实测结果的对比,验证所建模型的正确性;然后分析了变电站站内有无电气设备接地体影响时的工频电场分布情况。文章方法为考虑接地体影响时站内工频电场的计算与分析提供了一种有效、快捷的途径。     

A looming crisis? [HV engineering skills competency]

This article addresses an analysis of electric power disruptions from "inside the fence" causes over a four-year period in the global operations of a large chemical company. The underlying causes suggest problems in maintaining knowledge, skills, and experience in engineering, technical, and risk-management disciplines essential to power system operations. The authors have surveyed other large industrial companies to validate these findings and to project trends that could impact our industry. Survey results indicate that many of the respondents are heading down the same path. Industry procedures for performing electrical tasks are in need of improvement.