电网调度运行智能防误技术

构建基于电网拓扑的调度智能防误系统,基于拓扑图形生成申请票、操作票,实现检修申请票与调度指令逻辑互锁,并综合利用防误技术手段,有效提高调度系统综合防误水平。遵守IEC 61970标准,建立基于EMS平台的主配网合一的大电网拓扑结构,做到电网图形、拓扑、数据免维护。实现了主配网联合操作的一体化防误、安全提示。对电网的接线方式、运行方式、操作规则进行建模,形成了电网全仿真图形平台。     

基于面向对象编程技术的调度操作票专家系统

电网调度操作票专家系统是编排电网调度操作票的智能系统,其应用是现代供、配电站综合自动化、智能化的一个重要方面,能有效地预防和避免电网倒闸操作中的误操作.作者通过对电网结构和电网调度操作票建立机制进行分析,提出了将面向对象知识库和产生式规则系统原理相结合,应用数据库与面向对象编程(OOP)技术来实现电网调度操作票专家系统的方法,给出该方法的设计思想、应用和系统的主体框架.实际应用证明,基于此方法开发的操作票专家系统具有使用方便、易于维护、操作票准确性高、处理问题能力强等优点.     

实现电网调度自动化的关键技术探讨

调度自动化是现代化电网建设的重要组成部分,近年来,随着许多新理论、新方法、新器件的不断出现,使电网调度自动化技术不断进步、设备不断更新。因此,我们有必要对其关键技术进行重新审视。本文通过分析电网调度自动化系统的基本构成,分别对操作系统、数据采集、传输、可视化等关键技术的应用问题进行探讨。     

论电力调度运行中的安全控制

电力调度的主要任务是指挥电网运行的倒闸操作,电网故障和事故处理,尽可能地保证电网的正常供电。近年来,电力调度的技术装备水平不断提高,也使电力调度的现代化程度越来越高,对电网的安全稳定运行起到了极大的促进作用。结合电力调度运行的特点,从电力技术及调度人员等常见的安全意识等方面探讨了电力调度运行中的安全策略。     

电网调度技术在智能电网应用中的思考

作为将先进的传感测量技术、分析决策技术、信息通信技术、自动控制技术、能源电力技术以及电网基础设施高度集成而形成的新型现代化电网,智能电网具有坚强、经济、自愈、集成、兼容、优化等特征,已经逐渐成为输变电网络的发展主力。电网调度技术是确保智能电网经济、安全和稳定运行的基础和前提,因此本文笔者就电网调度技术在智能电网的应用进行探析。     

基于SVG技术研究电网调度自动化系统中的应用

图形在电网能实现自动性控制的过程中扮演着重要的角色,并且是电网在不同的系统中进行交互操作的基本前提。该文在介绍IEC 61970标准对图形交互要求的基础上,探讨了电网调度自动化系统中基于可缩放矢量图形（SVG）/公共信息模型（CIM）的图形互操作性,即将SVG与CIM相结合,实现能量管理系统EMS图形文件与SVG文件的动态转换,既提高基于Web的图形发布水平,又便于不同EMS间图形的导出/导入,展示了SVG技术在电力系统图形交互方面的优势,并在实践中获得应用。     

基于操作风险分析与控制的电网多时态分析技术

多时态分析主要包括基于未来态的电网分析及当前态的电网监视。当前态监视对实时监测数据进行初步的整理和分析,通过对实时监测数据进行分析和校验,提炼反映电网运行裕度和可靠性的更充分的信息。未来态分析技术是电网调度安全智能预控系统的基础之一,其本质是结合未来某时间段的电网负荷预测情况、拓扑变化情况,通过安全分析后的结果,实现对电网未来状态的监视。研究了该技术在调度操作风险分析中的应用,系统应用结果表明,多时态分析技术能准确反映电网未来运行状态,及时找到系统运行及操作方案的薄弱点并提醒调度员加以控制。     

浅析电网调度自动化系统技术

本文作者通过对电网调度自动化系统技术现状及发展趋势进行分析,并对新一代电网调度自动化系统的未来需求和发展方向进行了有益的探索.     

浅析调度自动化系统及故障解决对策

调度自动化是一种借助于现代化的网络技术来完成电网调度的工作,从而更好地对电网运行状况进行监控的自动化系统,它直接关系着电网能否安全快速的发展。它的存在,有利于调度工作人员对电网运行状况做全面的了解,从而保证电网运行的安全性和稳定性。本文对调度自动化系统出现的故障做了重点分析,并提出了相应的处理方法。     

调度遥控操作安全约束系统研究

随着我国电网覆盖面的不断扩大,电网结构变得越来越复杂,数据采集和监控系统开始广泛应用于电力系统中,电力系统是一个极为复杂的系统,尤其是调度运行工作异常复杂且艰巨,很多操作都能够通过调度和集控中心直接进行远程遥控操作。这样,电网运行面临的遥控误操作风险也就越来越大,对调度遥控操作进行安全约束就显得十分必要。该文根据实践,结合实际就调度遥控操作安全约束系统的相关问题进行了分析和研究,以期能够对电网的安全运行起到一定的促进作用。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-