基于IEC62056的电能表事件监测技术

构建一种基于IEC62056通信规约的电能表事件监测软件设计方法，可以实现计算机与多种电能表的通信和数据采集，克服现有电能表通信软件兼容性差、互联性差等缺点。简述IEC62056系列通信规约．给出基于IEC62056通信规约的电能表事件监测的程序设计流程和软件设计，本软件已在多功能电能表监测系统中得到应用。     

基于CAN总线技术的智能电能表通讯协议检测装置的研制

国内各智能电能表生产厂家对电表通讯协议遵循的行业标准、企业技术标准理解不一造成部分电表内部数据无法抄读,影响用电信息的采集。本文提出一种使用CAN总线通讯技术的智能电能表通讯协议检测装置,分析阐述研制原理与组成、主要部件工作机理以及软件系统。装置可同时实现对多台智能电能表同时进行通讯协议一致性检测,并可完成电能计量等多功能项目的检测。     

单相多用户多功能智能化电能表设计与实现

介绍了一种以单片机为核心,采用专用电能计量芯片设计的单相多用户多功能智能化电能表,并提供了其硬件和软件设计。该电能表可实现电能计量、复费率、远程抄表、预付费、定时供电控制等多种功能。     

多功能电能表的计量算法研究

本文阐谜了电子式多功能电能表的设计方案．计量算法的设计原理和软件设计流程。并以NEC的uPD78F0338单片机为例，实现了一教具有四种费率．六条负荷曲线和两套费率结构的三相四线电子式多功能电能表。本方案具有计量算法先进，功能全面．现场配置灵活和可靠性高的特点。     

三相复费率网络化智能电能表的研制

本文介绍了一种三相复费率网络化多功能电能表的研制,该电能表以专用电能计量芯片ADE7758和PIC16F877A单片机为核心,可以测量多个参数,并具有分时段复费率计量、网络通信等功能.本文介绍电能表的硬件设计和软件编程、网络化通信及全数字化校准的方法.     

多功能电子式电能表的主要功能及计量外的多种应用

介绍了多功能电子式电能表的特点和主要计量功能,并从挖掘潜能解决实际问题的视角,对其计量外的应用提出了新的建议。     

三相四线制电子式多功能电能表的设计与实现

为了满足电子式多功能电能表应用市场需求,开发新产品,其设计采用智能型计量方法、优化软件代码等途径,通过创机关报电子式多电能表的设计方法、介绍硬件设计的关键技术、给出软件设计流程等主要环节。进行功能优化。并以NEC的uPd78F0338单片机为例．实现了一款具有四种费率、六条负荷陷线和两套费率结构的三相四线电子式多功能电能表设计,实践证明,该电能表可以同时计量正／反向有功电能、正／反向无功电能、四象限无功电能,还具有多费率控制、负荷曲线记录,各相失压、过压、频率超限记录、数据LCD显示等多种功能。     

380v直接接入式三相三线电能表的计量误差分析

针对电网中380v三相四线供电低压用户还存在用三相三线电能表的情况,对380v系统直接接入式三相三线电能表用在三相四线系统中的各种运行工况的计量误差分析。从理论上分析包括各种单相负荷、两相负荷、三相负荷情况的误差,得出量化的误差数值,以此引起供电部门重视,促使违反规程使用三相三线电能表计量三相四线系统电能的情况进行整改。此分析对追补电量的计算亦有一定的参考价值。     

基于RN8302三相多功能防窃电电能表的设计

本文针对采用ADE7758作为电能计量芯片而设计的电表存在着功能简单和精度低等缺点,提出了一种新型数字式三相多功能防窃电电能表的设计方案。该方案采用RN8302芯片和PIC16F877A芯片,不仅能计量多种电能参数以满足不同的实际需求,而且可对芯片内部寄存器的参数进行微调,使其达到很高的计量精度。     

基于C#的多功能电能表校准软件设计

多功能电能表在配电系统中应用广泛,其计量的准确度对企业管理和考核至关重要,因此在设计多功能电能表时需要对其进行校准,满足一定应用等级。常规的多功能电能表校准方法是以电能脉冲校准为主,现提出一种基于C#和功率校表法的多功能电能表校准软件设计思路,采用串口进行通信,波特率可配置,同时可校准多台多功能电能表,最多可同时支持18块多功能电能表,通过校准后多功能电能表精度可达0.2级。     

电动葫芦电气线路的改造

1现状分析 桥、门式起重机常常以钢丝绳电动葫芦或环链式电动葫芦作为起升机构及运行机构，并且大多数采用地面操纵式。常见的有电动单梁(悬挂)起重机、葫芦门式起重机、葫芦定柱式悬挂起重机、葫芦壁上起重机、轻型葫芦双梁起重机。对电动葫芦的电气部分由于没有统一的国家标准，原机械行业标准又不统一，     

Method of electric powertrain matching for battery-powered electric cars

The current match method of electric powertrain still makes use of longitudinal dynamics, which can’t realize maximum capacity for on-board energy storage unit and can’t reach lowest equivalent fuel consumption as well. Another match method focuses on improving available space considering reasonable layout of vehicle to enlarge rated energy capacity for on-board energy storage unit, which can keep the longitudinal dynamics performance almost unchanged but can’t reach lowest fuel consumption. Considering the characteristics of driving motor, method of electric powertrain matching utilizing conventional longitudinal dynamics for driving system and cut-and-try method for energy storage system is proposed for passenger cars converted from traditional ones. Through combining the utilization of vehicle space which contributes to the on-board energy amount, vehicle longitudinal performance requirements, vehicle equivalent fuel consumption level, passive safety requirements and maximum driving range requirement together, a comprehensive optimal match method of electric powertrain for battery-powered electric vehicle is raised. In simulation, the vehicle model and match method is built in Matlab/simulink, and the Environmental Protection Agency (EPA) Urban Dynamometer Driving Schedule (UDDS) is chosen as a test condition. The simulation results show that 2.62% of regenerative energy and 2% of energy storage efficiency are increased relative to the traditional method. The research conclusions provide theoretical and practical solutions for electric powertrain matching for modern battery-powered electric vehicles especially for those converted from traditional ones, and further enhance dynamics of electric vehicles.     

Superhigh-speed electric motors

Superhigh-speed electric motors, with rotor speed up to 500000 rpm and power up to 100 W, are of interest for surface micromachining. A mathematical model of such motors is developed by means of Ansys Maxwell software. The motors are experimentally studied.     

电火花加工电极间隙电场分布研究

以电极间隙电场分布为研究对象,通过求解拉普拉斯方程,推导得到了均匀电场中,微粒周围电场强度分布的解析表达式。通过数值仿真计算,得到了受电极尖角、微粒影响的电场分布云图。从解析计算和数值仿真计算两个方面分析了最大电场强度与电极间隙、微粒介电系数、微粒直径的关系。通过对两种计算方法得到的结果进行对比,找出了解析计算与数值计算结果存在误差的原因。     

并联混合动力电动汽车电辅助控制策略仿真分析

以并联式混合动力汽车为研究对象,分析了ADVISOR软件中缺省的并联混合动力电动汽车现有电辅助控制策略存在的问题,然后对其主要控制参数进行了修改,最后在ADVISOR软件中进行仿真对比分析,仿真结果表明经过修改后的控制策略,电机效率由原来的38%上升到43%,发动机效率由原来的22%上升到27%,系统整体效率由原来的10.3%上升到12.1%,综合油耗由原来的5.8 L/100 km下降到4.9 L/100 km,整车的性能和燃油经济性都有了一定的提高。     

多功能钢丝绳电动葫芦

钢丝绳电动葫芦是我国电动葫芦行业的主导产品 ,目前生产批量之大 ,品种规格之多是其它形式的电动葫芦还无法替代的产品。近年来 ,国内钢丝绳电动葫芦发展也较快 ,不断有新的品种规格问世 ,以适应市场发展的需求。多功能钢丝绳电动葫芦相对常规钢丝绳电葫芦而言 ,功能上有多种特殊要求。湖北蒲起机械股份有限公司 (原蒲圻起重机械总厂 )最近成功地开发出了ＤＨＣ型多功能钢丝绳电动葫芦系列产品 ,并已应用于黄河小浪底水利枢纽工程、浙江秦山核电站、广西来宾电厂等单位。本文就ＤＨＣ型多功能钢丝绳电动葫芦在开发多功能方面作些简要介绍。…     

Wavelet-based information filtering for fault diagnosis of electric drive systems in electric ships

Electric machines and drives have enjoyed extensive applications in the field of electric vehicles (e.g., electric ships, boats, cars, and underwater vessels) due to their ease of scalability and wide range of operating conditions. This stems from their ability to generate the desired torque and power levels for propulsion under various external load conditions. However, as with the most electrical systems, the electric drives are prone to component failures that can degrade their performance, reduce the efficiency, and require expensive maintenance. Therefore, for safe and reliable operation of electric vehicles, there is a need for automated early diagnostics of critical failures such as broken rotor bars and electrical phase failures.In this regard, this paper presents a fault diagnosis methodology for electric drives in electric ships. This methodology utilizes the two-dimensional, i.e. scale-shift, wavelet transform of the sensor data to filter optimal information-rich regions which can enhance the diagnosis accuracy as well as reduce the computational complexity of the classifier. The methodology was tested on sensor data generated from an experimentally validated simulation model of electric drives under various cruising speed conditions. The results in comparison with other existing techniques show a high correct classification rate with low false alarm and miss detection rates.     

电动钻机电气控制系统故障排除浅述

结合现场多年的工作经验及在实际工作中的一些想法，概括出电动钻机电气控制系统故障排除的一些基本的指导性意见。对现场工作人员具有一定的指导作用。     

插电式电动汽车入网体系框架研究

为解决未来电动汽车(EVs)普及所带来的能源供应紧缺及其接入对电网的影响等问题,将车辆入网(V2G)技术应用到智能电网中。简要综述了V2G概念及研究现状,探讨了在中国实现EV入网的几种模式,提出了在未来中国智能电网环境下EV通过微网并与大电网进行融合的框架结构,从电网技术操作与电力市场经济两方面,对所有参与EV入网过程与活动的参与者作了描述,最后给出了需要开展研究的技术重点和方向。研究结果表明,该V2G技术及其体系框架可充分利用车载储能系统与电网功率进行双向互动,支持大规模可再生能源利用,提高电力系统效率及稳定性,加快电动汽车普及。     

Operation algorithm for a parallel hybrid electric vehicle with a relatively small electric motor

In this paper, operation algorithms for a parallel HEV equipped with a relatively small motor are investigated. For the HEV, the power assist and the equivalent fuel algorithms are proposed. In the power assist algorithm, an electric motor is used to assist the engine which provides the primary power source. In the equivalent fuel algorithm, the electric energy stored in the battery is considered to be an equivalent fuel, and an equivalent brake specific fuel consumption for the electric energy is proposed. From the equivalent fuel algorithm, distribution of the engine power and the motor power is determined to minimize the fuel consumption for a given battery state of charge (SOC) and a required vehicle power. It is found from the simulation results that the fuel economy and the final battery SOC depend on the motor discharge energy and it is the best way to charge the battery only by the regenerative braking, not by the engine to improve the overall fuel efficiency of the HEV with the relatively small motor.