Review of Power Supply and Distribution Construction Technology for Highway Electromechanical Engineering

In recent years,China has made significant progress in the construction of highways,resulting in an improved highway network that has provided robust support for economic and social development.However,the rapid expansion of highway construction,power supply,and distribution has led to several challenges in mechanical and electrical engineering technology.Ensuring the safe,stable,and cost-effective operation of the power supply and distribution system to meet the diverse requirements of highway operations has become a pressing issue.This article takes an example of a highway electromechanical engineering power supply and distribution construction project to provide insight into the construction process of highway electromechanical engineering power supply and distribution technology.

THE APPLICATION OF SATELLITE POSITIONING TECHNOLOGY AND ITS INDUSTRIALIZATION IN CHINA

Satellite positioning technology has been widely used in all kinds of military and civil land, marine, space and aeronautical target positioning tasks, naviga tion activities and accurate surveying measurements since 90 s in the last cen tury due to its advantage in providing all-weather, real-time, three dimensional and high precision positioning information, as well as speed and accurate timing information. By now, it has already formed a new hi-tech industry basically.This paper briefly reviews the development of the global satellite positioning and navigation technologies including the basic information of China's "Plough navigation system", introduces the history of satellite positioning technology and its major application fields as well as the status quo of this being industri alized trade in China, gives an account of the writers' vision for the application and prospect of the satellite positioning technologies in China, and approaches the tactics and stresses of the satellite positioning technology's application and its industrialization future in China.

THE PROSPECTIVE OF NEW TECHNOLOGY DEVELOPMENT FOR SUSTAINABLE ELECTRIC POWER SUPPLY IN CHINA

China is a large developing country with rapid growth rate. To the year 2050, its electric power will be increased by six to eight times, reaching 1.5—1.8 TW total installed capacity. The development can not only rely on the existing technology, it is crucial to accelerate the new technology development. This article discusses the perspective of various new technologies from the available energy resources and the required increase of electric power.

Application of Distributed Intelligent Power Supply Technology in Expressway Tunnels

With the coordinated development of today's social economy with science and technology,various advanced technologies are being used in highway engineering,especially the distributed intelligent power supply technology in expressway tunnels,which has a very significant advantage.In order to realize the effective application of this technology and promote the power supply effect in expressway tunnel,this study analyzes the advantages of this technology and its application in expressway tunnel,hoping to provide scientific reference for the application of distributed intelligent power supply technology and the engineering development of expressway tunnels.

New generation traction power supply system and its key technologies for electrified railways

Unlike the traditional traction power supply system which enables the electrified railway traction sub- station to be connected to power grid in a way of phase rotation, a new generation traction power supply system without phase splits is proposed in this paper. Three key techniques used in this system have been discussed. First, a combined co-phase traction power supply system is applied at traction substations for compensating negative sequence current and eliminating phase splits at exits of substations; design method and procedure for this system are presented. Second, a new bilateral traction power supply technology is proposed to eliminate the phase split at section post and reduce the influence of equalizing current on the power grid. Meanwhile, power factor should be adjusted to ensure a proper voltage level of the traction network. Third, a seg- mental power supply technology of traction network is used to divide the power supply arms into several segments, and the synchronous measurement and control technology is applied to diagnose faults and their locations quickly and accurately. Thus, the fault impact can be limited to a min- imum degree. In addition, the economy and reliability of the new generation traction power supply system are analyzed.

Design and Simulation of a Electrorheological(ER) Control High Voltage Power Supply

Few applications with electrorheological （ER） fluids have been found in industry. One reason is high voltage power supplies cannot meet the requirement for ER effect. In this paper, an ER control high voltage power supply for engineering application was designed which reduced power wastage by adopting soft switch technology; lessened its volume to satisfy micromation when adopting the planar transformer and improved its response character- istic by choosing an assistant discharging circuit. Simultaneously, a simulation analysis has been carried out. As results, the output voltage of this high voltage power supply is 5 kV, and the voltage can be continuously regulated and the voltage ripple is only 0. 7 %, so the requirement of stability is also achieved.

基于DDS的数字脉冲电火花沉积电源研究

在电火花沉积加工中,脉冲电源的放电参数对沉积效果和加工效率有重要影响。针对传统电火花沉积电源放电参数可控性差的问题,基于直接数字频率合成(DDS)技术全数字化调制、输出稳定的特性,设计了一种数字脉冲电火花沉积电源。以单片机和DDS芯片为核心来控制斩波电路输出加工脉冲,可实现放电电压、频率等参数的较精确控制以及宽范围内的无极调节。经测试,控制及驱动模块输出信号稳定、准确且频率误差在1 Hz以内,放电电压波形可控性好,满足电火花沉积加工的要求,可用于电火花沉积加工基础研究。

供配电技术课程思政项目化重构

为了实现职业教育高素质高技能的人才培养目标,阐述了供配电技术课程思政项目化教学内容的重构:一方面,将学科导向的教学内容重构,设计出以产业需求为导向的、融入电力行业现行国标规范的项目化知识结构,实现“技”的培养;另一方面,在项目化教学内容中,深入挖掘并有机融入思政元素,实现“德”的培养。供配电技术课程思政项目化,实现了在职业教育教学过程中传授知识技能、孕育意识形态,凸显了职院校“德技并修”的人才培养目标。

基于5G+UWB和惯导技术的井下人员定位系统

针对煤矿井下人员定位系统在实际应用中存在因设备算力与存储资源不足导致无法使用复杂测距与定位算法,定位数据即时传输与响应性能不足,在系统部署方面人力物力损耗较大等问题,提出了一种基于5G+UWB和惯导技术的井下人员定位系统。在末端部署能耗低、抗干扰性强的UWB定位基站,定位基站与5G基站以级联的方式连接,定位基站采集UWB与惯导数据,利用5G网络回传至计算平台,在计算平台上完成定位信息的解算和存储。将基于惯导的人员位置估计作为预测值,将基于UWB的三边定位算法获取的人员位置估计作为观测值,利用卡尔曼滤波器将预测值和观测值进行融合,降低定位误差。在煤矿主体实验基地搭建测试系统,模拟真实煤矿井下环境并进行对比实验。结果表明:(1)在x轴和y轴,融合惯导的卡尔曼滤波算法得出的位置信息和真实位置信息的重合度最高,说明融合惯导的卡尔曼滤波算法得出的位置信息最接近真实位置,平均误差为22.192 cm。(2)5G+UWB和惯导技术组合的井下人员定位系统的位置信息和真实位置信息的重合度最高,误差为[15 cm,20 cm],x轴最大平均误差为26 cm,y轴最大平均误差为24 cm,超过目前大多数井下人员定位系统精度。

金融服务体系创新助力农业强国建设探析

巩固拓展脱贫攻坚成果同乡村振兴有效衔接、实现城乡共同富裕和农业农村现代化,必须把建设农业强国摆在更加重要的位置。金融是我国经济的重要支柱,对于加快农业强国建设的意义重大,金融服务体系则是建设农业强国的重要保障。金融服务体系创新助力农业强国建设主要通过优化农业补贴投入方式、助力农业科技创新发展、推动现代农业产业体系建设来实现。目前,金融服务体系创新助力农业强国建设存在农业产业发展资金不足、农村数字金融基础设施建设水平不高、农村金融服务体系发展滞后、农村金融数字化人才匮乏等诸多问题,难以满足建设农业强国的要求。金融服务体系创新助力农业强国建设应从农业发展资金支持、农村数字基础设施建设、农村金融服务体系完善和农村金融数字化人才培养等方面协同发力。

基于储能的非电气化铁路新型牵引供电系统架构及关键技术

为解决非电气化铁路采用110 kV/220 kV强网传统方案构建电气化铁路牵引供电系统难度大、成本高的问题,提出一种基于储能的以风、光等新能源为主体的新型牵引供电系统。分别从储能技术类别、工作原理、数学模型和典型应用等方面对新型牵引供电系统进行总结,阐明适配新型牵引供电系统的储能技术属性,阐述新型牵引供电系统内涵、特征和形态,并建立新型牵引供电系统的电气拓扑、测控平台、监控网络和管控逻辑架构;面向新型牵引供电系统源-荷随机强波动特征,从整体视角论述组分相互作用机理、系统稳定运行机制、能量流均衡机制和系统效能涌现机理,以及规划与优化配置、电能高效变换、能量自洽调度、效能评估和性能保持等关键技术。结果表明:建立基于储能的非电气化铁路新型牵引供电系统,可实现非电气化铁路的绿色低碳、弹性自洽、经济高效的电气化升级;为后续开展“理论研究-仿真验证-试验验证-评估优化”循环迭代的闭环研究提供参考借鉴。

基于PDR算法与伪平面技术的井下人员定位方法研究

为了降低行人航位推算(Pedestrian dead reckoning,PDR)算法在进行井下人员定位时产生的累积误差,提出了一种基于PDR算法与伪平面技术的井下人员定位方法。首先,采用惯性导航传感器获取井下人员的步态信息,通过线性步长估计模型和四元数法实现步长估计和方向估计,利用PDR算法推算人员的位置;其次,使用井下人员活动区域以及预设的标记点构建伪平面,并将井下人员位置映射到伪平面坐标上,为降低PDR算法的累积误差做准备;最后,采用SVM进行井下人员活动检测,通过转弯活动判断其是否处于特殊标记点,将PDR解算的位置与伪平面内已知转弯位置标记点进行相关性分析,完成伪平面信息与工人位置的匹配,校准并更新PDR位置,降低累积误差。结果表明:井下工人在完成单个转弯活动过程中,传统PDR算法解算位置平均误差为0.98 m,而进行伪平面修正后平均误差降低到0.31 m;在完成区域性多活动过程中,采用伪平面技术修正后的PDR平均定位误差从1.08 m降低到0.38 m。因此,所提出的井下人员定位方法有效提高了PDR算法的定位精度。

智算时代一体化电源应用分析

AI算力需求的爆发给智算数据中心系统建设带来高功率、散热难、转型困难等挑战。探讨了一体化电源系统的技术革新及其在提升智算中心使用效率、建设效率、运行可靠性与安全性方面发挥的作用。提出了一体化电源解决方案,并结合实际案例分析,证明该方案在系统集成性、稳定性、可靠保护机制以及对数据中心整体安全策略方面具有显著的优势,其智能化管理平台支持实时监测、数据分析与决策,对于预防潜在风险、提高应急响应速度具有重要意义。

绿色工业园区供能技术方案及经济性分析

工业园区是经济发展的重要载体,园区的生产活动需要大量的能量供给,因此可靠、经济的供能技术是高耗能产业运行的重要保障。首先对当前主要供能方式的系统结构与运行特性进行分析,包括自备电厂、大电网购电、孤岛模式微电网和并网模型微电网;然后综合经济性、可靠性和环境效益,建立了供能技术评价指标体系;最后,以某电解铝生产园区为实际算例,分析4种供能方式在工业园区应用中的经济性表现,并综合未来碳价格和储能成本的发展趋势进行敏感性分析,可为工业园区投资者和相关政策制定者提供决策参考。

基于多电平滞环电流控制的牵引供电系统可控宽频带阻抗测量技术

精确获取牵引供电系统的宽频带阻抗特性,是分析车-网耦合系统的宽频带振荡问题的关键途径,对保障电气化铁路的安全稳定运行具有重要意义。目前的阻抗测量技术大多难以兼顾大功率与频带可控的测量要求,因此,该文提出一种基于多电平滞环电流控制的牵引供电系统可控宽频带阻抗测量技术,测量频带为10 Hz~5 kHz,可通过一次谐波扰动注入快速获取目标频带的系统阻抗,相比于传统的滞环电流控制方法,具有更低的开关频率,并且能有效避免死区效应,改善输出电流的波形,更适用于宽频信号的跟踪控制。最后,通过仿真和硬件在环实验验证了该测量技术的有效性。

煤矿供电系统防越级跳闸技术及其应用

随着煤矿生产过程中的电力需求不断增长,煤矿供电系统的安全运行成为了研究重点。首先,论述了防越级跳闸技术在煤矿供电系统中的重要性。然后,对防越级跳闸技术的实现方法进行了详细分析。接着,提出了一种基于智能电网技术的防越级跳闸方案,并通过实际煤矿供电系统的仿真实验验证了其有效性。

低温燃料电池在汽车工程中的供储能特性分析

低温燃料电池作为一种先进的能源技术,其在汽车工程中的应用日益受到关注。首先,低温燃料电池技术可以直接将燃料(如氢气)的化学能转化为电能,无须经过燃烧过程,因此其能量转换效率远高于传统的内燃机。这种高效性使得低温燃料电池汽车能够在保证动力性能的同时,降低能源消耗,提高行驶里程。其次,低温燃料电池在反应过程中主要产生水和热,不产生有害的尾气和颗粒物,从而实现了零排放。此外,低温燃料电池可以使用可再生能源(如太阳能、风能等)产生的氢气作为燃料,从而实现能源的循环利用。综上,针对低温燃料电池在汽车工程中的供储能特性展开分析综述。

人工智能技术在供电营业服务中的应用

现阶段,人工智能技术在社会各行各业生产环节中都得到了广泛应用。基于电力服务环节本身的复杂性特点,将人工智能技术与供电营业服务相结合可建立健全的供电企业营业服务系统,减少供电营业服务中出现失误问题的概率,因此,电力部门需要以电力营业厅实际运行需求为依据,在把控人工智能技术应用重点的基础上,开展供电营业服务工作,以减少电力营业厅运行所需要的人工成本。基于此,本文主要研究了人工智能技术在供电营业服务中的应用。