摘要
频域法不仅能判断系统的稳定性而且直观地显示系统增益与相位的稳定裕度,为工程设计人员所乐于采用。同步发电机数学模型通常以d、q轴坐标系统及派克方程为根据,其电流、电压及磁链在d、q轴上的分量是不对称的。古典频域法只适用于单变量控制系统,用以分析电力系统只得忽略发电机明显的不对称性。本文将IEEE研究电力系统次同步振荡的典型系统Ⅰ抽象成多变量控制系统模型,应用广义奈氏法〔1〕〔2)分析了用电流反馈平息电力系统次同步振荡问题〔3〕、〔4〕、〔5〕,为采用多变量频域法分析电力系统振荡提供了一个例证。
The paper illustrates how to use a multivariable frequency domain approach(the Generalized Nyquist Criteria) to analyze subsynchronous resonance in power systems. The d q axes reference frame and Park equations are the basis of the mathematical model for synchronous machinery. Engineers prefer the frequency demain methods which not only shows if the system is stable but also characterize the sensitivity of the feedback system to phase and/or gain errors. The application of the frequency domain method to synchronous machines had to neglect the unsymmetry until the appearance of the multivariable frequency domain method in late 1970＇s.
出处
《电力系统自动化》
EI
CSCD
北大核心
1989年第5期22-27,共6页
Automation of Electric Power Systems
