间歇性电源高渗透电网输电规划方案评价和筛选方法

基于对间歇性电源高渗透条件下电网规划的特殊影响因素以及现有规划方法和工具局限性的讨论,提出了电网接纳间歇性电源的能力指标和计及电网连锁反应过程的安全风险指标等方案补充评价指标;提出了基于风电场经济上可接受的最小年发电量和电网安全性等因素判断电网接纳风电能力是否合适的方法;还提出了应用了多种辅助软件的适用于间歇性电源高渗透电网输电综合规划的流程、方案评价和筛选方法。研究结果表明,采用上述方法可在间歇性电源高渗透电网规划方案综合比较选择中计及电网事故过程等复杂特性,是评价和筛选此类电网的规划方案的有效途径。     

适体坐标下二维差分网格自动剖分的研究

开展了适体坐标系(Body-Fitted Coordinates,BFC)网格自动生成技术的研究,弥补了有限差分法在笛卡尔直角坐标系下模拟结果连续性差、对不规则区域边界适应性差等不足。采用椭圆型偏微分方程法生成适体坐标网格,并在对DXF文件解析的基础上,针对二维单连域规则图形及二维双连域任意图形开发了适体网格生成系统。结果表明,程序通用性好,能够对大多数复杂区域实现自动剖分,生成的网格能够很好地适应物理区域的曲率变化,物理区域内部的网格分布也比较合理。     

用格栅法测CPR1000不锈钢泵壳中的铁素体含量

根据AFNOR标准NF A05-165编写了新的CPR1000水压试验不锈钢泵壳组织铁素体含量金相检验工艺规程.在铁素体含量不均匀时,用格栅法沿水平和垂直两平面测定铁素体含量具有精确度高、误差小等优势,可用于铸件、锻件、焊接件等不锈钢产品的检验.     

网格服务的可迁移性研究

移动服务可以方便地解决网格环境中诸如负载均衡和容错等方面的问题。综合对网格工具Globus Toolkit各版本和移动代理技术进行研究,并对移动服务的工作原理及实现进行了探讨,给出了在网格环境中如何通过移动服务来解决负载均衡和容错等问题的应用技术。     

2015年特高压规划电网华北和华东地区多馈入直流输电系统的换相失败分析

基于2015年“三华”特高压规划电网的丰大运行方式,采用机电暂态仿真软件PSD-BPA,对华北、华东地区多馈入直流输电系统换相失败问题进行深入研究。研究结果表明,华北、华东地区任一直流发生单/双极闭锁故障时,均不会引起其他直流发生换相失败;华北地区大部分直流逆变站换流母线附近三永故障,不会导致其他直流换相失败;华东地区...     

Value of green hydrogen when curtailed to provide grid balancing services

This paper evaluates the potential of grid services in France, Italy, Norway and Spain to provide an alternative income for electrolysers producing hydrogen from wind power. Grid services are simulated with each country's data for 2017 for energy prices, grid services and wind power profiles from relevant wind parks. A novel metric is presented, the value of curtailed hydrogen, which is independent from several highly uncertain parameters such as electrolyser cost or hydrogen market price. Results indicate that grid services can monetise the unused spare capacity of electrolyser plants, improving their economy in the critical deployment phase. For most countries, up-regulation yields a value of curtailed hydrogen above 6 €/kg, over 3 times higher than the EU's 2030 price target (without incentives). However, countries with large hydro power resources such as Norway yield far lower results, below 2 €/kg. The value of curtailed hydrogen also decreases with hydrogen production, corresponding to the cases of symmetric and down-regulation.     

城市电力通信网“十二五”规划发展思考

文章从剖析通信业务需求的转变入手,提出了业务网、承载网建设在"十二五"期间应注意的技术问题,并从分析城市电力通信网的实际特点入手,阐述了在网络建设、专业管理等方面应重点关注的问题。     

圆形截面的四边形元素网格剖分

叙述了一种对圆形截面进行网格剖分的方法.圆形截面剖分后由不同类型的元素表示,节点的创建和元素的生成依据节点和元素在圆内的位置而采用不同的方式分别生成.     

Hybrid wind/PV/diesel hybrid power systems modeling and South American applications

This paper presents an applications case study and comparison of performance results between two computational models for simulating the performance of hybrid power systems. The first model, HYBRID2, was developed at the University of Massachusetts under National Renewable Energy Laboratory (NREL) sponsorship. The second model, SOMES, was developed at Utrecht University in the Netherlands. Both models have been designed to predict the technical and economical (life cycle cost) performance of hybrid power plants that typically might be comprised of renewable energy sources, a battery bank, and a diesel generator. A South American (Brazil) based hybrid power system used to power a remote telecommunications system was used for the applications case study. A final system configuration be used as a basis for model prediction comparison was established as a result of HYBRID2 parametric evaluation. Both codes yielded similar performance results, and this work points out that the predicted performance discrepancies are due basically to different subcomponent models and differences in control strategy. The generalized nature of this work is intended to be of interest to engineers involved with the design and analysis of hybrid power systems.     

应对能源挑战——IEC的角色 智能电气化——能效的关键

智能电气化理应是应对能源挑战的关键,电能是最容易控制和输送的一种能源形式。国际电工委员会(IEC)为了应对能源挑战计划改变其方向,将重点放到实现系统效率所需的标准上,尤其是要制定一套规范,对可接受的最低性能做出规定,同时也为电网运营提供充分选择。