广域电力系统振荡特性与控制研究

The low frequency oscillation caused by the interconnection of weakly coupled power systems threaten the security and stability of the interconnected power systems badly. It is an urgent task to investigate the mechanism and influencing factors of the low frequency oscillations, and design effective measures to damp the low frequency oscillations. By the comination of non-linear analysis methods and higher order spectrum theory, the effects of the high-order nonlinear interactions of low frequency oscillation modes on power system performance will be deeply researched in this project, and the changes of the critical low frequency oscillation modes and its main influence factors will be studed too. By the oscillation characteristics of the critical resonance point, the effect of higher order resonance on the singularity of power system oscillation will be analysized to explore the incentives of the low frequency oscillation.Then based on the influence factors and induced mechanism of the low frequency oscillation,the analysis method of the control system of power system and the design method of controllers for power system are researched by considering the high order nonlinear modal interaction and closed loop control.Then the basis of control theory and methods of low frequency oscillation in the framework of wide-area measurement and control is established.

系统互联引发的低频振荡问题严重威胁到互联电力系统的安全稳定运行，有必要深入研究互联系统中低频振荡的诱发机理及影响因素，进而找到有效的抑制措施。本项目将非线性模式分析法与高阶谱理论相结合，深入分析系统模式的高阶非线性相关作用对系统特性的影响，研究主导振荡模式的变化规律及其主要影响因素；从强共振点的振荡特性出发，分析高阶强共振情况对系统振荡奇异性的影响，探寻诱发电力系统低频振荡的物理本质；进而在电力系统低频振荡影响因素和诱发机理研究的基础上，研究兼顾电力系统高阶模态非线性相关作用和闭环控制两方面因素的电力系统控制系统分析方法和电力系统控制器设计方法，为建立在广域测量与控制框架下低频振荡控制理论与方法奠定基础。

电网互联引发的低频振荡问题严重威胁到互联电力系统的安全稳定运行，有必要深入研究互联系统中低频振荡的诱发机理及影响因素，进而找到有效的抑制措施。. 本项目找出了系统模式间的强共振点，分析了强共振点附近的振荡特性，并提出了PSS的综合参与因子配置法。具体地，我们进行了以下工作：1）查阅了近几十年来关于电力系统低频振荡的国内外文献、专利和报告等。2）分析了不同参数对系统根轨迹的影响，找出了系统模式间的强共振点。3）分别用非线性模式分析法和高阶谱分析了系统中强共振点附近的振荡特性，在系统强共振点附近，强共振的振荡模式间有较强的非线性交互作用，从而衍生出新的复合模式。4）提出了综合参与因子配置法，同时考虑了PSS输入信号和闭环控制两方面的影响，能兼顾系统的多种运行方式，同样适用于系统的重载运行方式，所提出的综合参与因子配置法对于PSS的配置具有重要参考价值。. 围绕本项目的研究，本课题组在国内外学术刊物和国际会议上共发表论文5篇，培养硕士研究生3名。