Trajectory Analysis of Time Delay for Frequency Oscillation Mode of Power System Based on Pade Approximation

被引：0
|
作者：
Chen J. [1 ]
Chen L. [1 ]
Chen Y. [2 ]
Min Y. [1 ]
机构：
[1] State Key Laboratory of Control and Simulation of Power System and Generation Equipments, Tsinghua University, Beijing
[2] Power Dispatching and Control Center of China Southern Power Grid, Guangzhou
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2019年 / 43卷 / 14期
关键词：
Automatic generation control; Frequency oscillation; Frequency oscillation mode; Pade approximation; Time delay;
D O I：
10.7500/AEPS20180830007
中图分类号：
学科分类号：
摘要：
Several frequency oscillation incidents different from conventional low-frequency oscillations in actual power systems are strongly related with primary frequency regulation (PFR) or automatic generation control (AGC). The power system frequency regulation process including PFR and AGC is a closed-loop control process, which is a dynamic system and faced with stability problems. In actual power system, the time delay caused by dispatching AGC commands to the execution of unit has a significant impact on the critical modes of the power system, thus changing the stability of the closed-loop system. Based on a three-area system, Pade approximation method is used to convert the time delay process into a state space expression and a linear mode of power system considering time delay is built with an appropriate approximate order. The eigenvalue calculation method is adopted to study the influence of time delay on frequency oscillation modes. The results of the simulation validate the conclusion that time delay will reduce the damping of system and cause periodic changes in AGC oscillation mode. © 2019 Automation of Electric Power Systems Press.
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页码：120 / 125
页数：5
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