计及励磁饱和环节的电力系统动态行为分析与域估计研究

项目名称： 计及励磁饱和环节的电力系统动态行为分析与域估计研究

项目编号： No.51307018

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 电工技术

项目作者： 李江

作者单位： 东北电力大学

项目金额： 25万元

中文摘要： 现代电力系统已越来越接近运行和控制极限，发生不稳定事故的风险显著增加。大量文献与前期研究证实，饱和环节产生作用后，励磁电压为常数，将使发电机失去电压调节能力，影响电力系统潮流计算、电压稳定和系统安全运行，然而，其对电力系统动态的具体作用机理目前尚未清楚。因此，本项目旨在从域的角度研究励磁饱和环节对电力系统动态行为的作用机制，完善吸引域和安全域估计的理论体系。项目拟采用非线性理论与方法，在极限运行状态下，充分考虑各类励磁系统的动态特征，构建含饱和环节的系统数学模型，分析状态轨迹在切换面上的动态过程，深入研究过励限制器对系统动态行为的作用机理，从而提出饱和非线性系统吸引域估计的优化算法，以及电压稳定安全域的计算方法，进一步提高域估计的准确性。项目研究成果，将有助于认识扰动、吸引域、安全域三者间的内在规律，为电力系统稳定性研究提供重要理论与方法，同时也为非线性系统理论的发展和应用作出一定贡献。

中文关键词： 饱和环节；动态行为；吸引域；安全域；有理非线性

英文摘要： Due to that the modern power systems are operated and controlled close to their capability limits, the risks that they would undergo unstable accidents are increasing unprecedentedly. The saturation element starts to function when the excitation voltage reaches the upper threshold, which consequently causes excitation voltage to become a constant and makes the synchronous generator excitation lose its capability in voltage adjustment. It has already been clearly demonstrated in both literatures and the applicant's previous studies that the lost capability of synchronous generators to regulate voltage has significant adverse impacts on load flow calculation, voltage stability and security operation. The aim of the proposed project is to study the mechanism of how saturation elements effect power systems' dynamic behaviors near their operation limits and therefore to fundamentally improve both the theories and methodologies used for estimating region of attraction and security region accordingly. To be more specific, the proposed research consists of the following closely linked workpackages: i) it will fully consider the dynamic characteristics of all types of excitation systems to build nonlinear mathematic models for power systems with excitation saturation elements; ii) it will investigate the mechanisms behin

英文关键词： Saturation Element；Dynamic Behavior；Region of Attraction；Security Region；Rational Nonlinearity