基于岸基的动力铅酸电池脉冲充电技术的研究与应用

结合J．A．Mass提出的电池充电规律,利用半实物仿真系统开展动力电池的快速充电技术研究,探索出具有工程可实现性的充电模型程序。利用成熟的PWM技术设计厂快速充电系统,具有良好的标准化系列化的技术特征。     

船舶阀控式铅酸蓄电池充电温度补偿技术

本文介绍了船舶阀控式铅酸蓄电池的充放电原理、充电特性和影响其使用寿命的原因.同时,结合现有船舶阀控式铅酸蓄电池现状,研究分析在船舶环境条件下温度和阀控式铅酸蓄电池充电特性的关系,提出采用温度补偿充电技术可以较好的提高船舶阀控式铅酸蓄电池的使用寿命.并在上述理论分析和工程应用的基础上,给出温度分段梯度补偿充电特性曲线.     

Vertical separation as means to establish interoperability in road tolling in Europe

As more European roads become tolled by various means, an increasing share of road users become subject to more than one tolling scheme in their regular driving. This can be especially burdensome for long distance hauliers, who may pass several countries and tolled motorway systems during the course of 1 day. For this reason, a range of projects have been initiated attempting to increase the level of interoperability between tolling systems, many of which with only limited success. By analyzing current incentives, costs and benefits for toll operators and road users, we conclude firstly that the current level of interoperability is likely to be lower than socially optimal, and secondly that a direct regulation making the provision of interoperability mandatory is likely to be in excess of what is socially optimal. We argue that vertically separating the monopolistic toll operators could be a cost-efficient way to achieve a socially optimal level of interoperability as a equilibrium market outcome.     

高速公路联网收费系统网络管理及安全性分析

随着全国高速公路联网收费工作的不断深入,路网不断扩大,为了保护不同投资主体、不同收费公司的利益。如何运用先进的IT技术来确保联网收费系统网络的可靠性和安全性越来越受到高速公路管理者的普遍关注。     

基于1+x证书制度的计算机类专业高职学生分层差异教学研究

2019年1月24日,国务院印发《国家职业教育改革实施方案》(简称"职教二十条"),指出从2019年开始,在职业院校、应用型本科高校启动"学历证书+若干职业技能等级证书"制度试点工作,为职业院校教育改革带来了新的突破口.在今年全国两会上,李克强总理在《政府工作报告》中提出,"今年高职院校大规模扩招100万人".基于此,...     

Determining locations of charging stations for electric taxis using taxi operation data

The adequate provision of charging infrastructure is critical for the effective deployment of electric taxis. This study attempts to locate charging stations for electric taxis reflecting real-world taxi travel patterns identified from taxis equipped with digital tachographs. Data for one week are processed in order to estimate their charge demand. The estimated temporal distribution of charge demand indicates that it varies day-by-day and hour-by-hour. The maximum set covering model is applied for determining the locations of charging stations. The results show that the pre-specified service distance and service coverage rate (defined by the proportion of total demand served) can be critical factors for determining the number and location of charging stations. These factors should be carefully specified by considering the tradeoff between operational efficiency of charging facilities and user convenience.     

基于图时空神经网络的多充电站负荷协同预测方法

针对传统充电站负荷预测方法只能实现对单一站点预测的问题，提出一种基于图时空神经网络 （Graph Spatiotemporal Neural Network， GSTNN） 模型的多充电站负荷协同预测方法。定义时空信息图，描述充电站负荷之间的时空关系；构建时空特征提取网络，分别利用图卷积神经网络和门控序列卷积网络提取信息图的空间和时间维度信息，并使用长短期记忆网络 （Long Short Term Memory Networks，LSTM） 挖掘影响负荷预测的外部特征信息；融合提取的所有特征，进行负荷预测。算例结果表明，基于 GSTNN模型的方法能充分考虑时空特征和外部特征的影响，协同多个充电站的负荷数据进行预测，并同时输出各充电站的预测结果，有效提高预测准确度，有助于电网稳定运行。     

专用道条件下电动公交线路静态无线充电设施布局优化

为了减少电动公交线路静态无线充电设施的布设成本，从而提高时间控制点的有效利用率，提出了考虑时间控制点影响的静态无线充电设施布局优化方法。首先建立电动公交车运行状态表达模型，提出乘客出行时间成本增加量计算方法；随后在总松弛时间、电池剩余电量、准点率的约束下，将每个站点是否布设静态无线充电设施、是否设置为时间控制点以及对应的松弛时间作为优化变量，将充电设施总布设成本与乘客出行时间成本增加量最小以及站点有效利用率最大作为优化目标，建立专用道条件下静态无线充电设施布局优化模型，并采用嵌入随机模拟技术的麻雀搜索优化算法进行求解；最后以一条实际线路为例进行案例分析，并对电池容量、充电功率进行敏感性分析。研究结果表明：在满足不同班次电量需求的前提下，充电设施的总布设成本、乘客出行时间成本增加量随着电池容量或者静态无线充电功率的增加而减少，且充电设施的总布设成本呈阶梯形状变化。