eCAN和Ethernet在同步相量测量装置中的应用

文章在基于数字信号处理器(DSP)和高速AVR单片机双CPU的同步相量测量装置PMU(Phasor Measurement Unit)的研究基础上,提出了一种eCAN总线(Enhanced Controller Area Network)与工业以太网相结合的PMU数据通信方案.讨论了eCAN的硬件设计原理和软件设计流程,设计了基于高性能数字信号处理器TMS320LF2407的连接CAN现场总线和工业以太网的嵌入式现场网关,实现了PMU与现场工控机(动模实验)以及远程控制中心的实时通信.     

eCAN和Ethernet在同步相量测量装置中的应用

文章在基于数字信号处理器(DSP)和高速AVR单片机双CPU的同步相量测量装置PMU(PhasorM easurem entUn it)的研究基础上,提出了一种eCAN总线(Enhanced Controller Area Network)与工业以太网相结合的PMU数据通信方案。讨论了eCAN的硬件设计原理和软件设计流程,设计了基于高性能数字信号处理器TMS320LF2407的连接CAN现场总线和工业以太网的嵌入式现场网关,实现了PMU与现场工控机(动模实验)以及远程控制中心的实时通信。     

PI在ERP深化应用中的研究与实现

针对企业信息化系统之间的集成问题,系统应用方案(SAP)基于Exchange的协同和集成技术,提供自动化业务流程方法,使用Web服务优化现有投资,将SAP应用集成(process integration,以下简称PI),以吉林电力有限公司ERP(企业资源计划)高级应用财务管控模块为例,对PI的体系结构、作用机理、参数优...     

工业以太网Ethernet／IP及Profinet的特点与应用

由于工业自动化系统正向分布式、智能化的实时控制方面发展,用户要求企业从现场控制层到管理层能实现全面的无缝信息集成,并提供一个开放的基础构架,这些都要求控制网络使用开放的、透明的通信协议,但是以前的系统往往无法满足这些要求。近年来,国际工业控制领域的共同趋势是使用基于IEEE802．3和TCP／IP的网络技术,     

电网谐波功率潮流方向与电力滤波器的应用

分析了电网谐波功率潮流方向对其安装的无源滤波器和有源滤波器的影响,证明了只有根据电网谐波功率潮流的方向和谐波源类型来确定所使用的滤波器及其工作方式才能达到预期的滤波效果。     

PSO算法在互联电网CPS功率调节中的应用研究

研究了电网中不同类型AGC机组在功率缺额下所应该承担的比例大小问题。采用标准PSO算法对CPS控制策略中AGC机组调节功率的分配进行机组种群优化。利用标准PSO算法,可以避免平均分配法较难得到最优解的缺陷,从而在经济性的条件下使CPS指标达到最优。通过算例进行仿真计算,证明了该算法的有效性。     

PSO算法在互联电网CPS功率调节中的应用研究

研究了电网中不同类型AGC机组在功率缺额下所应该承担的比例大小问题.采用标准PS0算法对CPS控制策略中AGC机组调节功率的分配进行机组种群优化.利用标准PSO算法,可以避免平均分配法较难得到最优解的缺陷,从而在经济性的条件下使CPS指标达到最优.通过算例进行仿真计算,证明了该算法的有效性.     

柔性直流输电系统功率模块研究与设计

模块化多电平换流器(modular multilevel converter,MMC)是电压源换流器直流输电(voltage source converter-high voltage DC,VSC-HVDC)技术领域的一种新型多电平换流器。文中首先介绍了MMC的拓扑结构及功率模块的工作原理;再从功率模块的系统架构、软硬件设计、损耗计算等方面阐述了功率模块的设计方法;在此基础上利用PSIM软件对功率模块的对拖运行进行了建模与仿真。最后通过实验验证了功率模块设计的合理性与可靠性。     

基于Web Services的电力企业应用集成技术研究与实现

Web Services是在现有的异构平台基础上构筑一个通用的、与平台、语言无关的技术层,使各种不同平台之上的应用依靠这个技术层来实施相互的连接和集成.论文在分析传统的软件开发模式和系统集成方法给电力企业应用集成带来的诸多问题的基础上,提出了利用Web Services技术来实现电力企业应用集成（PEAI）的解决方案,并针对企业间数据集成的实际情况,给出了一个简化的数据集成系统实例和实现方法.     

桥头铝电办公自动化系统的开发与应用

Lotus Notes是世界级群组软件,也是主流开发平台之一,桥头铝电股份有限公司在Lotusr、Notes平台上利用其先进软件技术开发了办公自动化系统,使该公司办公自动化和管理水平迈上了一个新台阶。文章介绍了Lotus Notes平台的特点,对桥铝股份有限公司OA系统的设计、实现做了详尽的介绍。     

Repairability of Energy-Efficient Motors

The high-efficiency energy-saving ac motor is becoming commonplace in industry today. One of the questions frequently asked upon purchasing one of these motors is, "Can it be repaired economically and still maintain its efficiency?" This question is addressed by specialized processes necessary to repair these motors properly along with the elements that will enable engineering and maintenance personnel to make an educated repair decision.     

基于PLCBUS协议教室照明智能控制系统设计

介绍PLCBUS电力线通讯协议,利用PLCBUS-9402393模块结合教室实际照明电路设计教室智能照明控制系统,给出了智能照明系统接收模块电路、控制模块电路、照度传感器电路,进行了系统模拟实验。此系统无论新教学楼还是投入使用的教学楼用户都可以使用,具有很强的灵活性和稳定性。     

高效节能配电变压器优化计算程序

介绍了基于VB语言的高效节能配电变压器计算程序的开发与实现过程。     

Comparison of Technologies for New Energy-Efficient Lamps

Energy-efficient light bulbs are being developed to replace the incandescent lamp where they can satisfy the design criteria and be used in'sockets that have long hours of annual use. The four technologies discussed include the compact fluorescent lamp, coated-filament lamp, electrodeless fluorescent lamp, and ' compact high-intensity discharge lamp. The systems demonstrate efficacy improvements of two to four times that of their incandescent counterparts. These new lamps have required considerable advances in lamp technology. They offer the potential for achieving efficacies close to 80 Im/W. These new lamps will reduce the energy used annually by incandescent lamps (190 billion kWh) by more than 50 percent in the 1990' s, at which times they will be commonly employed.     

A Stable and Intelligent Energy-Efficient Solid-State Induction Motor Controller

A three-phase AC voltage controller can be used for energy saving while feeding a lightly loaded induction motor. In this paper, while optimizing the power consumed by the motor, the sampling time ( Delta t) and the step change in firing angle ( Delta alpha) have been appropriately chosen by simulating the transient performance of the system using the simulation language SIMNON. A combination of current minimization scheme and power factor maximization scheme has been advocated here which yields better savings than the constituent schemes individually. A functional relationship between the optimum value of alpha ( alpha opt) and the load on the motor has been deduced so that for a given load the same optimum point is attained always in spite of the inaccuracies in the current sensing mechanism. The hardware implementation is based on an Intel 8085 processor. The processor develops this functional relationship (AngleLoad Pattern) by learning the system behavior for two or more different load conditions. Thus, it can intelligently adapt itself to any variations in the system parameters because of temperature rise or other nonlinearities.     

An Energy-Efficient ASIC for Wireless Body Sensor Networks in Medical Applications

An energy-efficient application-specific integrated circuit (ASIC) featured with a work-on-demand protocol is designed for wireless body sensor networks (WBSNs) in medical applications. Dedicated for ultra-low-power wireless sensor nodes, the ASIC consists of a low-power microcontroller unit (MCU), a power-management unit (PMU), reconfigurable sensor interfaces, communication ports controlling a wireless transceiver, and an integrated passive radio-frequency (RF) receiver with energy harvesting ability. The MCU, together with the PMU, provides quite flexible communication and power-control modes for energy-efficient operations. The always-on passive RF receiver with an RF energy harvesting block offers the sensor nodes the capability of work-on-demand with zero standby power. Fabricated in standard 0.18-$mu$ m complementary metal–oxide semiconductor technology, the ASIC occupies a die area of 2 mm $times$ 2.5 mm. A wireless body sensor network sensor-node prototype using this ASIC only consumes $≪$ 10-nA current under the passive standby mode, and $≪10 mu$A under the active standby mode, when supplied by a 3-V battery.      

An Energy-Efficient Electric Plant for Hot Steam and Water Supply of Agricultural Enterprises

The efficiency of electric energy use in the thermal technological processes of agricultural production can be significantly increased by using it during a period of reduced rate. The design features of an energy-efficient electric storage unit for steam and hot water supply of the agricultural facilities are considered. The electric plant includes a storage water heater, steam generator, section of steam superheating to a temperature of 140°C, control cabinet, and stop and safety valves. When heating the heat medium in all units of the plant, an indirect electric heating method was applied. A method of calculation of the electrical, thermal energy, and structural parameters is proposed. The results of physical modeling of the processes of heat transfer between the electric heater and heat medium are presented, and they are described mathematically. The dependence of the heat transfer coefficient on the specific surface power of the heaters when water boils in a large volume for the installed structure of the electric steam generator is obtained. The dynamics of the convective heat transfer between the electric heater and steal flow is studied. The economic efficiency of use of the storage electric plant is demonstrated, and it is shown in practical use.     

三相PWM整流器的研制

本文提出了一种基于空间矢量脉宽调制(SVPWM)的直接电流控制策略的三相电压型PWM整流器,给出了它的拓扑结构及数学模型.为了提高系统的可靠性,优化了主电路结构设计及控制系统软硬件设计,并搭建了样机进行试验.试验结果表明三相PWM整流器带负载运行效果良好,所设计的控制系统具有很好的稳态和动态性能.     

管型基元LED的研究

该文阐述对一种采用微晶芯片制成的管型基元LED的研究,这种管型基元LED结构是将N个≤25μm×25μm的芯片贴装在透光导热良好的基片上,通过串并联后再与梳篦状结构的导电和导热的反光板连接,然后再将其装入透光性好的玻管,两端分别用特殊形状的插接端子引出电源,并气密性封接和充入1atm以上的干燥氮气或其他惰性气体。这种管型基元LED的测试结果表明,其光效比同批次采用1 mm×1 mm尺寸的芯片提高1倍以上,而且在输入电流加大25%左右时也没有明显降低。研制成果表明它能为普通照明和液晶显示器的背光照明提供一种高光效的管型基元LED元件。