【作者】 周剑；

【导师】 张毅威；

【作者基本信息】 清华大学 ， 电气工程， 2004， 硕士

【摘要】 电力系统安全稳定分析是保障电网安全稳定运行的重要环节。随着电网的不断建设和发展,安全稳定性对电网的实际运行更为重要,且分析的复杂和困难程度也相应增加。为此,必须在实践中采取各种措施和手段提高安全稳定分析水平。本文通过对电力系统安全稳定分析方法的研究及分析软件的设计,在对实际运行电网进行安全稳定分析的过程中提出了较为全面和可行的电网稳定分析与安全评估方法。论文从电力系统安全稳定问题的基本概念出发,概述了暂态稳定分析的两个基本方法:时域仿真法和直接法。对照新颁布的《电力系统安全稳定导则》的要求,论文分析了国内安全稳定分析方法的现状,认为现有分析方法在全面性和效率方面尚需要提高,特别是在运用时域仿真法进行稳定计算分析时还没有重视稳定裕度的概念。因此,本文提出了对现有分析方法加以改进的研究思路和解决方案。首先在广泛使用的时域仿真法中引入直接法中的稳定裕度概念,通过在现有电力系统仿真程序的基础上编制一套实用的分析软件,实现自动地对电网进行系统全面的安全稳定计算,对计算结果按事故严重程度排序,为安全评估提供有效信息。然后分层次逐步进行N-1故障和特殊复故障的分析,充分考虑各层次之间的内在联系。最后进一步研究多种预想潮流方式下各种运行参数变化对系统稳定运行的影响。根据提出的研究思路和解决方案,本文对安全稳定分析软件做出了具体的设计和开发,并以国内实际电网作为分析实例,应用分析软件对电网进行了安全稳定计算,分析讨论计算结果和系统安全状况,对失稳算例研究了稳定控制措施。分析结果表明,本文所采用的安全稳定分析方法可靠、全面和实用,对今后提高大电网安全稳定分析水平具有一定的应用价值。更多还原

【Abstract】 Power system security and stability analysis is necessary to the security and stability operation of power systems. With the growth and development of electrical networks, the security and stability analysis gets more and more complex and difficult. This dissertation aims to find out comprehensive and practical approaches for stability analysis and security assessment.First of all, the basic concepts of security and stability are explained. And the features of time-domain simulation and direct methods for transient stability analysis are discussed. Compared with the Chinese “Guide on security and stability for power system”, the conventional analysis method is difficult to meet the requirements of comprehensiveness and effectiveness. Therefore, the new ideas and analysis approaches are proposed to solve this problem. The concept of stability margin, a factor of critical importance in security assessment, is induced into time-domain simulation method. Then extended software with the core of existing simulation program is designed, which can help analysts automatically scan predefined contingencies for the whole system, and useful information for security assessment is abstracted according to stability margins. The system security is assessed in two steps: N-1 contingency and multiple-fault contingency, whose relationship should be fully taken into account. At last, the analysis work is focused on the change of system stability with the variation of different operational parameters.According to the above ideas and approaches, the security and stability analysis software is developed. Based on a real-world power system in China, the simulations are carried out by this software and then analysis approach is demonstrated. After the system security is assessed, feasible stability control measures are investigated. It is shown that the proposed methodology is reliable, comprehensive and practical. It is significantly effective for the <WP=5>security and stability analysis of large-scale power systems.更多还原