青海电网联合反事故演习综述

电网联合反事故演习是预防电网事故的有效手段,是保证电网安全稳定运行的重要措施之一,也是一项涉及大量专业人员和技术支持设备的系统性工作.文章介绍了青海电网联合反事故演习的方案编制、组织管理、技术支持系统、演习评价与总结等方面要求,对反事故演习的规范化进行了探讨.     

联合反事故演习中存在问题分析

以长春电网的一次全网性联合反事故演习为例,在介绍联合反事故演习概况的基础上,综合分析了反事故演习过程中变电运行在应急管理以及应急响应方面暴露出的一些问题,提出了旨在准确快速处理电网事故、确保安全稳定运行的应急人员组织架构和各级人员责任制度,以全面提高电网在大负荷状态下预防大面积停电事故的应急反应能力。     

华中电网联合反事故演习综述

论述了开展联合反事故演习的重要意义,回顾了华中电网历次联合反事故演习的情况,指出了演习方案的设计依据和所要考察的内容,介绍了演习的组织分工和技术设施.最后,提出了搞好反事故演习、保障电网安全稳定运行的建议.     

某区域电网联合反事故演习的启示

为了进一步实地检验电网解环工程的薄弱环节,掌握电网在大负荷状态下的运行特点,预防大面积停电事故的发生,举行了"山西南部电网联合反事故演习".在介绍联合反事故演习概况的基础上,针对演习中所暴露出的电网结构和运行管理问题,系统分析和论证了产生问题的原因,并且基于地区电网的现状,结合近年来国内外发生的典型电网事故案例,提出了保证电网安全稳定运行和应对大面积停电的措施.为进一步完善该地区的电网解环工程提供了基础,也为同类电网的管理提供了借鉴.     

华东电网联合反事故演习管理

电网事故具有突发性、快速性和灾难性.如何快速隔离故障、限制事故的扩大,恢复电网的正常运行,保证供电的可靠性,是电力调度人员、技术人员、安监人员研究的课题.反事故演习是解决这一课题直接、有效的方法,同时可以通过反事故演习提高调度人员的素质.详述了华东电网公司在联合反事故演习方面的管理方法,并展望了今后的发展和工作方向.     

东北电网2000年系统联合反事故演习方案设计

反事故演习是保证电网安全稳定运行的重要一环。详细介绍东北电网2000年系统联合反事故演习方案设计的背景及演习目的、演习题目，分析模拟事故前后系统的潮流电压变化情况，指出演习及事故处理的要点，提出方案设计要针对实际系统，要模拟重负荷和严重故障形态的设计思想。     

2003年宁夏电网联合反事故演习方案设计

反事故演习是保证电网安全稳定运行的重要一环。详细介绍了宁夏电网2003年系统联合反事故演习方案设计的背景及目的，分析了模拟事故前后系统的潮流电压变化情况，指出了事故处理的要点，提出了针对实际系统模拟重负荷和严重故障形态的设计思想。     

开展电网联合反事故演习活动的实践与探索

电网联合反事故演习，是预防电网事故的有效手段，是保证电网安全稳定运行的重要措施之一，是一项涉及大量专业人员和技术支持设备的系统性工作。本文阐述了在开展电网联合反事故演习工作中的一些经验和建议，包括演习组织措施、技术支持、进程控制、总结评价等方面应注意的问题，以便更严密、高效地开展此类活动。     

基于联网DTS的奥运会电网联合反事故演习

电网安全风险管理的核心就是形成安全预警机制,山东电网应对潜在停电故障组织开展了联合反事故演习,本次演习以2008年奥运会承办城市青岛为中心,建立在联网调度员培训模拟系统(DTS)的基础上,结合山东奥运电网联合反事故演习的组织实施情况,介绍了奥运电网联合反事故演习的组织机构、方案制定、技术支持和方案实施等内容,以期为电网公司相关调度机构组织奥运反事故演习起到参考作用。     

利用多种通信方式配合电网反事故演习

电网事故具有突发性,如何快速隔离故障,限制事故的扩大,恢复电网的正常运行,保证供电的可靠性,是电力调度人员、技术人员、安监人员研究的课题.反事故演习可以提高调度人员的素质,是解决这一课题直接、有效的方法.文章结合山西电网反事故演习中通信解决方案,对反事故演习中使用到的各类设备及其发挥的作用进行了描述,希望能对通信专业利用多种通信手段为电力生产服务提供帮助.     

联网DTS在宁夏电网联合反事故演习的应用

结合宁夏电网联合反事故演习中暴露的问题,阐述了应用联网DTS系统的必要性,介绍了宁夏电网DTS系统联网的方案设计,并探讨了联网DTS系统在大规模联合反事故演习中的应用。     

EPC项目的工程施工分包模式研究

从风险管理角度,以海外火电EPC项目为例,对EPC项目的两种常用施工分包模式进行了分析研究。研究表明,资源组织和管理不当、施工图不及时以及土建安装施工交叉影响是工程施工阶段影响进度的主要因素。分专业分标段分包和施工整体分包都能对EPC总承包商起到不同程度的转移和减轻风险的作用,但作用特点不同。EPC总承包商应根据分包模式各自的特点并结合自身的经营管理水平,选择好分包模式,同时加强合同管理,才能保证通过分包措施真正达到转移及减轻风险的效果。     

充裕性资源协同参与系统调节的风电消纳能力分析模型

大规模风电消纳能力取决于整个电力系统各环节充裕性资源综合协调的能力。在深入分析影响风电消纳能力关键要素的基础上,提出了调动广泛灵活的充裕性资源协同参与系统调节,提高风电消纳能力的基本理念和方法。从界定并识别电力系统发电、输配电、用电等环节灵活充裕性资源出发,综合考虑火电、水电和风电的发电技术特性,电力和热力负荷平衡、输电容量等约束,以系统运行成本最低为目标,建立了风电消纳能力分析模型。以我国某风电大省为实际算例,模拟分析了引入不同灵活资源情景下风电消纳能力的变化情况。结果表明,增加各类灵活资源均能提高风电消纳能力,其中,调峰容量资源的影响程度最大。     

联网DTS在宁夏电网联合反事故演习中的应用

宁夏电网DTS作为EMS系统的高级应用软件,在经过改造、升级后,扩展了网络功能,为省调、地调、各电厂、变电所提供一个共同的数字化的联合电网平台。结合2004年宁夏电网联合反事故演习中DTS的应用情况,本文就DTS系统的结构、功能、网络通讯及应用时的组织措施和技术措施等进行分析和总结。     

Modal controllability and observability of power-system models

A method is presented for quantifying a controller's ability to manoeuvre and reconstruct the electromechanical modes of a power system. The method is based on the concepts of modal controllability and observability, as well as a novel eigenvector-scaling criterion, which gives rise to physically meaningful results. An example is given using a multi-terminal DC/AC power system.     

Adaptive steering of a containership based on neural networks

This paper describes the design of an adaptive autopilot for a containership. Well‐known results of linear adaptive theory are extended through the use of neural network to the case where the plant dynamics are described by a set of non‐linear equations. The desired behaviour of the containership during course‐changing manoeuvre is defined by the response of a reference model. Using an indirect approach, the controller parameters are adjusted based on the definition of an estimation error. The proposed adaptive controller is tested by a simulation study based on a non‐linear model, describing the dynamics of a containership in four degrees of freedom. In order to take into account the wave effects, a stochastic model of the ship wave‐induced motion is considered. Shallow water effect is also considered by changing some of the hydrodynamics parameters. Copyright © 2000 John Wiley & Sons, Ltd.     

Intelligent remote teleoperation

Teleoperation permits humans to manoeuvre robots from a distance. Thus, a human's ability to intelligently manipulate and inspect can be performed in an otherwise inaccessible environment. As a result, teleoperation is gaining acceptance as a cost-effective way to work in remote, often hazardous, environments. However, two significant challenges in designing such systems remain: 1. The communication link between the teleoperator and the telerobot's location is usually bandwidth limited and has time-varying delays. Research shows that even a fraction of a second delay between generating a command and observing the corresponding action can seriously degrade the human operator's intuition. This, in turn, diminishes effectiveness. 2. The human teleoperator must rely on artificial means to gain sensory information from the remote environment. This observation is always incomplete due to current bandwidth and sensor limitations. (Also, it is received in a delayed fashion.) The communication channel also limits the fidelity with which the human teleoperator can intervene in the remote environment. The research presented here addresses human/machine cooperation over a bandwidth-limited communication channel with time-varying delays. This cooperation is crucial for taking advantage of the automation's efficiency and the human operator's intelligence     

A new aerodynamic decoupled frequential FDIR methodology for satellite actuator faults

This paper presents new results regarding the development of a supervision scheme for a nonlinear satellite model. The main issue concerns the handling of frequency faults affecting the reaction wheels of a spacecraft attitude control system, that is, how to detect and isolate faults, how to determine the different frequencies characterising these faults through spectral analysis and lastly, how to prevent propagation into failures with potential mission abortion as a consequence. Thus, this work investigates the design of a scheme for fault detection, isolation and control reconfiguration applied to the reaction wheels of a spacecraft attitude control, based on the satellite model. This scheme is classifiable as active fault tolerant control. As the study focuses on a general satellite nonlinear model, where aerodynamic and gravitational disturbances, as well as measurement errors, are present, the robustness of the suggested strategy is achieved by exploiting an explicit disturbance decoupling method via a nonlinear geometric approach. To achieve accurate fault diagnosis, aerodynamic disturbance decoupling represents the key point because the aerodynamic model is often uncertain. Moreover, an improvement of the nonlinear geometric approach is presented, to realise both aerodynamic and manoeuvre decoupled fault diagnosis. To the best authors’ knowledge, this is the first works presenting a methodology for frequency fault diagnosis, which is based on the nonlinear geometric approach for fault and disturbance decoupling. The obtained results demonstrate that the proposed methodology can achieve better performances with respect to traditional fault detection and isolation schemes. Copyright © 2013 John Wiley & Sons, Ltd.