同步发电机受到小扰动后的稳定性分析

Stability Analysis of Synchronous Generators Subjected to Small Disturbances

随着现代生活对高质量电能要求的逐步提高,电网的稳定性和安全性对于人们生活生产越来越重要。励磁变动、负载增加或甩负载以及阻尼绕组变动等引起的小干扰,会造成同步发电机暂时或永久失稳,进而影响电力系统整体的稳定性。为此,利用时域法的MATLAB数学模型,研究阻尼系数与自动励磁系统对发电机受到小干扰后稳定性的影响,获得不同情况下发电机功角和转速的振荡曲线,进而分析励磁调节器对发动机稳定性的作用。

With the increasing demand for high-quality electricity in modern life,the stability and safety of the power grid are becoming increasingly important for people's daily life and production.Small disturbances caused by excitation changes,load increase or load rejection,and damping winding changes can cause temporary or permanent instability of synchronous generators,thereby affecting the overall stability of the power system.To this end,a MATLAB mathematical model using time-domain method is used to study the influence of damping coefficient and automatic excitation system on the stability of the generator after being subjected to small disturbances.The oscillation curves of the generator power angle and speed under different conditions are obtained,and then the effect of excitation regulator on engine stability is analyzed.