电力系统安全稳定控制是保障系统可靠运行的重要手段，一直受到广泛重视。现代电力系统规模迅速发展的同时也带来了更多更复杂的安全隐患和稳定问题。研究和应用计算机、通信、电子以及现代控制理论等最新技术和方法，开发和生产各种稳定控制系统及安全自动装置，是电力系统安全运行的迫切要求
本文立足于系统的稳定控制问题，结合新一代智能型低频低压减载装置的科研项目，研究了相关领域并提出了新的思想，为更深入的研究奠定了基础。
本文首先综述了电力系统安全稳定控制的研究现状，从控制理论及控制措施(装置)两方面概述了国内外的主要研究成果。最后简要介绍了安全稳定控制技术的发展趋势。
电力系统暂态能量函数直接法经过多年的研究，近来已取得重大进展，成为时域分析的重要辅助方法。本文第二章对暂态能量函数的基本理论和方法作了介绍，重点探讨了EEAC法及其在稳定切机控制中的应用。进一步的实用化还需要大量的工作。
多机系统频率动态过程是低频减载方案设计的重要依据，本文在原有线性化扰动模型基础之上，增加了发电机和负荷频率调节效应的影响，并进行了系统仿真研究。同时根据多机模型特点及仿真结果提出了一种基于多机系统的低频减载设计和整定新方案，与传统方案相比，该方案提高了低频减载性能及系统运行方式的适应性。
作为方案的一种实现，本文作者作为主要研制者之一研制开发了新一代微机智能型低频低压减载装置。第四章详细介绍了装置改进的软件测频算法，按功率定值减载的实现方法，软、硬件结构等关键技术措施。最后给出了装置的动模实验结果。
关键词： 安全稳定控制 低频低压减载 暂态能量函数 切机控制
EEAC 频率动态过程 频率仿真 按功率减载 测频算法
Abstract
Power system stability control, on which extensive attention has been paid, is an important measure to safeguard a reliable power system. With the quick development of power system, lots of more complicated security and stability problems are emerged. The safe running of power system requires eagerly the research and use of the latest technology of computer, communication , electronics and modern control theory to develop and manufacture stability control system and automatically safety control equipment.
In this paper, stability control of power system is focused. New ideas which
are the basis of deeper research are developed on the basis of extensive resource on related field in the process of researching a new intelligent style under frequency and under voltage load shedding equipment.
The latest research of power system stability control is reviewed firstly in this paper. Then, the main achievements at control theory and control equipment are introduced. At the end, the tendency of safety and stability control technology is introduced.
After years of research, direct method using transient energy function of power system has gotten important development, and has become the main method of time-fiend analysis. In chapter 2, basic theories of TEF method are introduced, and the EEAC method and its application in stability generator tripping control are discussed carefully. A lot of work still need to be done in order to make practical achievement.
The frequency transient process of multi-generator system is the important basis of under frequency load shedding scheme design. In this paper, the effects of frequency regulation of generator and load are included on the basis of linear disturbance model, and system digital simulation research is included too. According to the characteristics of multi-generator model and results of system digital simulation research, a new design and set scheme of underfrequency load shedding equipment on the basis of multi-generator system is developed in this paper. Compared&n bsp;with conventional scheme, this scheme advanced the characteristics of under frequency load shedding e
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