传统高压直流用于大规模陆上风电传输的经济可行性*

随着风电在全世界的爆发式发展,大规模风电传输成为研究热点之一。鉴于高压交流和风火打捆特高压直流等输电方案都存在其局限性,更多的传输方案有待研究。提出一种用变功率控制LCC HVDC系统传输大规模陆上风电的方案,即HVDC系统的有功功率实时跟随风功率变化,并基于一个特定案例对该方案进行了全方位的经济和技术可行性研究。为了更好地展现所提出方案的经济性,将定功率控制的LCC HVDC和所提出方案在当前和未来两套价格体系下进行了经济性比较;结果显示,在一定条件下变功率控制HVDC传输方案更具经济竞争力。     

用LCC方法对500 kV变电站改造的经济性评价

提出一种用全寿命周期成本(LCC)分析和计算对变电站改造实行经济评价的方法,是在综合日本及法国的变电站改造经验及参照了上海市电力公司在泰和站GIS改造方案的基础上形成的,通过对斗山变电站改造工程的经济评价实例,总结出变电站改造经济评价程序,旨在为今后华东电网类似的变电站改造提供一套完整的经济评价方法,也是在华东电网内扩大LCC方法应用范畴的一种全新尝试.其基本思路是结合现有的财务评价方法,以LCC为评价计算的标的,从而更科学和全面地评价变电站改造的经济性.     

SiC fines effects on the microstructure and properties of bauxite-based low-cement refractory castables

In the present paper, the effect of silicon carbide (SiC) fines was studied on the phase and microstructural properties of bauxite-based low-cement refractory castables (LCC) at different firing temperatures. XRD and SEM techniques were employed to evaluate phase and microstructure analysis, and physical/mechanical properties were measured according to standard methods. The results showed that the oxidation of SiC particles related to the oxygen partial pressure and active/passive oxidation behavior of SiC fines could markedly affect the microstructure and properties of bauxite-based LCC fired at high temperatures. Despite the negative influence of addition of SiC fines on cold mechanical strength, its usage up to 6 wt% could greatly improve the thermo-mechanical properties of LCC refractories due to increasing of matrix refractoriness.     

电力企业项目管理的重要环节

阐述了项目评估、项目全寿命周期成本管理、项目的计划、跟踪和控制在项目管理中的作用,具体分析了以上三个环节中的关键性因素.     

产品LCC估算模型研究及仿真分析

产品的全寿命过程包括方案论证、研制、生产、使用维修直到淘汰处理的整个过程,寿命周期费用（LCC）就是指上述各阶段中的费用总和,寿命周期费用的早期估算对于产品的设计、改进和优化,实现最佳的费效比具有重要的意义.该文对产品LCC的常用估算模型进行了分析和探讨,在此基础上实现了对典型武器装备LCC估算的基本仿真平台,可对仿真得出的数据信息建立相应的数据库管理系统,最后针对具体实例进行了验证,并分析、讨论了仿真结果.     

Elpipes for the High Capacity Backbone of an Asian Grid

Elpipes are polymer-insulated underground HVDC electric pipelines based on metallic conductors. Etpipes use relatively rigid extruded conductors designed for higher capacity and efficiency that are pra...     

基于可视化程序设计语言的编译系统

采用面向对象技术设计可视化程序设计语言的编译系统,通过对复杂的可视化图片语法进行分析,将各语法现象以语法单元类的形式进行抽象分类,提出了编译器－编译器的设计策略,给出了从可视化图片设计语言到伪指令代码的解决方法。主要研究在面向对象的编辑环境中如何实现满足硬件设备控制器的稳定、高效的编译系统。通过将可视化程序语言分析器(VPLPG)和小型的类C编译(LCC)器配合使用最终实现可视化程序设计语言的编译系统。     

宁德核电厂500kV送出线路导线选择

合理选择导线及其结构,对降低架空送电线路投资具有重要的意义。本文拟从LCC（全寿命周期成本）分析出发,提供导线选择的一种新思路,从而有效控制工程建设投资和运营费用。     

On combination of the equivalent material concept and J‐integral criterion for ductile failure prediction of U‐notches subjected to tension

The aim of the present research is to check the capability of the equivalent material concept (EMC) combined with the J‐integral failure criterion, called EMC‐J criterion, in predicting the load‐carrying capacity (LCC) of U‐notched ductile aluminium plates subjected to tension by considering the 2 moderate and large‐scale yielding regimes. For this purpose, first, a set of experimental results on LCC of 2 groups of thin U‐notched rectangular plates made of Al 7075‐T6 and Al 6061‐T6 are gathered from the recent literature. Then, because the Al 7075‐T6 and Al 6061‐T6 plates have ductile behaviour, EMC is employed to avoid performing elastic‐plastic failure analysis for LCC predictions. Up to now, different failure models in the context of the linear‐elastic notch fracture mechanics have been successfully utilized in combination with EMC for ductile failure prediction of notched members. However, this is the first time in this research that J‐integral, as a well‐known brittle failure criterion, is linked to EMC for predicting LCC of the U‐notched rectangular aluminium plates. Finally, it is shown that EMC‐J criterion can predict well the experimental results of tensile LCC.     

装备软件对装备全寿命费用的影响

在介绍装备软件全寿命费用构成的基础上,分析了装备软件全寿命费用的特点及其对装备全寿命费用的影响,提出必须在整个采办项目寿命期间,运用软件工程化技术,加强软件系统工程管理,确保软件的可靠性、稳定性、安全性和经济性,提高装备费用的使用效益。