电动汽车驱动系统EMC问题的测试及整改

随着电动汽车的不断普及,其与传统汽车相比增加了大功率、大电流的驱动系统部件,这些电力电子部件在工作时会发出强烈的电磁干扰,可能会使整车运行不稳定或影响车载或车外附近电气设备的正常工作,因此给整车电磁兼容问题带来严峻挑战,随之引起的EMC问题也逐渐突显.就一个由于电动汽车驱动系统EMC问题导致整车网络故障的测试及整改案例进行了研究,从干扰源、耦合路径、受扰源3方面进行了系统的分析.为该EMC问题导致整车网络故障的测试与整改提供了一个很好的参照案例与分析方法.     

GB 50169-2006《电气装置安装工程接地装置施工及验收规范》修订说明

1概况 本规范是根据建设部<关于印发〈二○○一～二○○二年度工程建设国家规范制定、修订计划〉的通知>(建标[2002]85号)的要求,由中国电力企业联合会负责,国电电力建设研究所会同有关单位,在<电气装置安装工程接地装置施工及验收规范>GB50169-1992的基础上修订的.该规范自1992年7月1日发布实施已有十多年了,规范中所规定的不少条款,与实际有较大的出入,因此,需要对本规范进行修订.     

GB 50170-2006《电气装置安装工程旋转电机施工及验收规范》修订说明

1 概况 本规范是根据建设部《关于印发〈二○○一～二○○二年度工程建设国家规范制定、修订计划〉的通知》(建标[2002]85号)的要求,由中国电力企业联合会负责,国电电力建设研究所会同有关单位,在《电气装置安装工程旋转电机施工及验收规范》GB50170-1992的基础上修订的.该规范由1993年7月1日发布实施,至今已有十多年了,规范中所规定的不少条款,已与当前实际有较大的出入,因此,需要对本规范进行修订.     

复合型防爆电气设备(装置)防爆结构的设计与制作

较为详细地讨论了在复合型防爆电气设备（装置）防爆结构设计时配套防爆电气单元的选择原则，防爆电气单元必须取得防爆合格证的必要性以及外壳（外置）的设计要求和接地要求；简要地介绍了复合型防爆电气设备（装置）制作（安装）时的注意事项。     

Comparative investigation of PWM techniques for a new drive for electric vehicles

Results of a comparative investigation of deterministic and random pulsewidth modulation (PWM) techniques to be employed in a new ac drive for electric vehicles are presented. The study, employing the advanced simulation package SABER from Avant! Corporation, was focused on the reduction of electromagnetic interference (EMI) when a deterministic PWM strategy is replaced with an RPWM method. To assess the impact of the PWM technique on the drive performance, the drive efficiency, torque ripple, and dynamic response of the current control system were also investigated. Two RPWM techniques characterized by random variations of switching frequency of the inverter were considered: one with the sampling frequency of the modulator varying in step with the switching frequency, and one with a fixed sampling frequency equal to the average switching frequency. The study has demonstrated good EMI-mitigating potentials of RPWM techniques, whose use results in EMI reduction by 10 dB and more, while the drive performance is barely affected.     

Control of an electric drive for a continuous material processing unit

A control system for two electric drives connected via the processed material is considered. One of the drives controls the speed and the other controls the voltage. Numerical relations are obtained and a mathematical simulation is performed for two variants of the structure.     

Rational control system of a traction electric drive for hybrid cars and electric vehicles with increased fault tolerance

An idea for fault tolerance improvement and an effective control system for the traction electric drive of hybrid cars and electric vehicles is offered.     

基于GIS的业扩报装优化与决策系统设计

业扩报装是供电企业营销和配网管理的一项重要工作,对形成并维持良好的配网结构、保证配网供电可靠性、提高配网资源利用效率等具有十分重要的意义。电力系统中,负荷和电力设备都是在较大的空间中广泛分布的;配网电压等级低,经济供电距离短,对空间数据的依赖性强。充分利用地理信息系统(GIS)管理空间数据的能力,建立业扩报装优化与辅助决策支撑平台,提出完整的基于GIS的业扩报装优化与决策系统功能设计。分析了GIS平台应整合的数据,按照变电站、馈线、设备3个层次,采用面向对象的方法集成预测信息、运行信息、设备台账信息和空间信息;提出了完整的业扩报装辅助决策流程,设计了业扩报装中每项决策信息的优化决策方法和辅助决策功能,包括所接入变电站、馈线、配电室等3个主要决策内容。采用该系统可提高供电企业的业扩报装水平,防止形成供电范围交叉,防止各条中压配网线路负载不均并减少负荷矩,降低规划建设人员工作量等。     

电动汽车充换电服务苏沪杭城际互联网研究与建设

嘉兴市是长三角地区电动汽车城际互联的重点区域之一。通过对嘉兴电力局在2011年苏沪杭城际互联网络建设情况的专题调研,介绍充换电站建设情况,分析嘉兴市发展电动汽车产业的前景和当前电动汽车充换电服务网络面临的形势和存在问题,为进一步推动电动汽车产业发展提出专业化建议。     

IEEE recommended practice for the testing, design, installation,and maintenance of electrical resistance heat tracing for commercialapplications

Specific test requirements for qualifying electrical resistance heating cables for commercial service and a basis for electrical and thermal design are provided. Heater characteristics are addressed, and installation and maintenance requirements are detailed. Recommendations and requirements for unclassified heating cable applications are provided     

电动客车配套电池的研制开发

简要介绍了为电动客车配套而开发的DM1 50 1 2型阀控密封铅酸蓄电池产品设计、工艺路线的优选以及性能测试的有关情况 ;同时根据研制开发过程中发现的一些技术问题对《电动车辆用铅酸蓄电池》 (国家标准征求意见稿 )提出了部分修改意见。     

Instrumentation, testing, and analysis of electric machine rotor steady-state heating

It is not a simple task to measure temperatures on the rotors or rotor components of large induction and synchronous machines during steady-state operation. The single greatest obstacle to obtaining these data is related to getting the data from the rotating element. Other problems are associated with instrumentation noise, sensor type, and attachment. This paper describes a number of techniques that have been used by the authors and their associates over the last 30 years. Test and calculated temperatures are presented for one machine. Also, test data from a number of machines are presented that show, for this particular population of enclosures and ventilation schemes, the steady-state temperatures at the design load can range from the value of the stator rise to greater than 70/spl deg/C higher.     

The nuts and bolts of a good installation

Most oil exploration and subsequent refining operations take place outside the continental areas of North America and Europe. There, the National Electrical Code (NEC), Canadian Electrical Code (CEC), and CENELEC standards are not the de facto codes and standards to which firms must adhere. There is limited control over where equipment is purchased, with the taut policy "to purchase from anyone that can meet the specifications." As a result, specifications become extremely critical since they are the primary means of controlling safety, functionality, maintenance, and reliability of the installation. When designing or specifying to IEC standards, there are several major areas to consider that contrast from NEC: the use of cabling systems, sealing methods, enclosures, lighting practices, and intrinsically safe circuits     

Synthesis and study of the structure of a sensorless asynchronous electric drive with vector control

Classical problems of the development of algorithms for estimation of nonmeasurable state coordinates for the systems of a general-purpose industrial asynchronous electric drives with vector control are discussed. Modern problems related to the synthesis of algorithms for preliminary and online identification of the essentially varying parameters of an induction motor are considered. A variant of the realization of these algorithms in a class of adaptive systems with the specifying model and the complete state observer is analyzed in detail.     

一套专供屏蔽电机试验用的工装

介绍屏蔽电机M－S曲线测试过程中电机循环液体的一种密封工装。     

新华电厂主厂房施工井点降水工艺特点及施工方法

根据新华电厂330 MW汽轮机发电机组技改工程主厂房基础施工中的实际地质情况,选用轻型井点与喷射井点相结合的降水方案,通过计算确定井点管埋设深度和井点管间距,采取分层二期降水的施工工艺进行土建施工,施工效果良好,保证了该技改工程主厂房基础施工顺利进行.     

Modeling, simulation, and analysis of permanent-magnet motordrives. I. The permanent-magnet synchronous motor drive

The application of vector control to the PMSM (permanent-magnet synchronous motor) is described, and complete modeling, simulation, and analysis of the drive system are presented. State-space models of the motor and speed controller and real-time models of the inverter switches and vector controller are included. Performance differences due to the use of pulsewidth-modulation (PWM) and hysteresis current controllers are also examined. Particular attention is paid to the motor torque pulsations and speed response. Some experimental verification of the drive performance is also given     

Modeling, simulation, and analysis of permanent-magnet motordrives. II. The brushless DC motor drive

For pt.I see ibid., vol.25, no.2, p.265-73 (1989). The authors develop a phase variable model of the BDCM (brushless DC motor) and use it to examine the performance of a BDCM speed servo drive system when fed by hysteresis and pulsewidth-modulated (PWM) current controllers. Particular attention was paid to the motor large-signal and small-signal dynamics and motor torque pulsations. The simulation included the state-space model of the motor and speed controller and real-time model of the inverter switches. Every instance of a power device turning on or off was simulated to calculate the current oscillations and resulting torque pulsations. The results indicate that the small- and large-signal responses are very similar. This result is only true when the timing of the input phase currents with the back EMF (electromotive force) is correct. The large-signal and small-signal speed response is the same whether PWM or hysteresis current controllers are used. This is because, even though the torque pulsations may be different due to the use of different current controllers, the average value which determines the overall speed response is the same