摘要
电力系统的迅猛发展对继电保护的要求不断提高,电子、计算机与通讯技术的飞速发展又为继电保护技术提供了新的工程手段。继电保护整定计算是保障现代大型电网安全运行的基础性工作,现有离线整定按最严重情况进行计算,缺乏一定的灵活性和适应性,不能适应智能电网的要求。定值在线评估与预警可以得到继电保护定值在实时方式下的适应性,对不适应的定值通过在线整定的方法加以调整。因此,实现继电保护在线整定计算与在线预警可以很大程度上提高电力系统运行可靠性,具有重要的理论意义及工程实用价值。
本论文重点研究了地区电网继电保护在线整定与评估预警相关关键技术。论文的主要研究工作为：根据继电保护的业务需求提出了具体的电网信息管理及交互的业务功能模型；对当前的国际标准进行了详细的分析,提出了适应地区电网的新一代继电保护交互模型,实现了有效的信息交互机制；采用网格计算方法实现了短路计算、整定参数计算等系统快速计算,分析了不同电网的运行方式,提出了各种电网结构下的网格计算方法；提出了不同网络模型一体化应用的组合方法；提出并实现了继电保护在线定值评估预警系统,可在线跟踪电网的运行方式,在线校核保护的上下级配合、灵敏度和躲负荷情况,并通过预想事故扫描,实现了保护定值安全预警功能；确定了适合地区电网实际的继电保护整定计算原则和配置要求；采用基于保护区间方法求取继电保护最优定值,基于故障信息系统实现了继电保护定值的在线整定；充分利用数据库技术、网络技术及计算机软件开发技术,在全图形界面平台上,以集成一体化的方式实现继电保护生产管理工作的全面自动化；将电力系统的静态安全分析、电压安全分析、暂态安全分析和继电保护定值校核等子问题进行在线综合研究,建立了一套完整的网络化继电保护整定计算和定值管理系统(石家庄地县调定值管理一体化系统),该系统已在石家庄电网中得到应用,为运行人员由离线分析向在线分析、由“经验型”调度向“智能型”调度转变提供了良好的平台和辅助工具。
The protection issues have made new demands with the advancement of technology and the rapid development of power systems. It has been continuously injected new vigor to the protection technology that electronic technology, computer technology and the rapid development of communication technology and technology development. Setting calculation of relay protection is the infrastructure work to ensure the safe operation of modern large-scale grid. The existing pattern of off-line have some inevitable drawbacks. When to achieve setting calculation of On-Line, some new setting calculation principles and configuration requirements should be established.The relay protection should meet the selectivity, sensitivity requirements, and also to improve adaptability. To achieve on-line setting calculation of relay protection should establish setting calculation of network, to extract from grid model and parameter, and to recognite power system operation status. This is bound to solve the interface and unified platform issues of on-line setting calculation system and SCADA, WAMS data; because massive data of grid and large-scale interactive and on-line calculation must be calculated in the existing software, the grid of theory can be strongly applicated.
With the internationalization development of the domestic electrical products and the relevant IEC standards constantly being introduced, digested, absorpted, the relevant safety standards and requirements get more and more concern and attention. The basic of on-line assessment early warning and relay protection is founded through the analysis and understanding of the relevant standards. Relay protection have a significant impact on the power system operation and stability, as the sentinel of safe and stable operation in power system. Therefore, the assessment of relay protection is that people have been the focus of attention and study. The important aspects of assessment contain that setting of reasonable protection and protection action is reasonable or not after the behavior.
In order to satisfy the requirements of Security and stability of power grid analysis for on-line, the power system static security analysis, voltage security analysis, transient analysis, and setting security checking and other sub-issues can be comprehensively studying. It has established a complete network of relay protection setting calculation and valuation management system and construction the value of the prefecture and county of Shijiazhuang management integration system. The system has been applied to the grid in Shijiazhuang,in order to the operating personnel from the off-line analysis of the line from "empirical" Scheduling to'smart'scheduling change provides a good platform and supporting tools.
引文
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