Analysis of Frequency Oscillation Caused by AGC in Hydro-Dominant Power Grids using Piecewise Linearization Method

A piecewise linearization model is developed for the analysis of ultra-low frequency oscillation, taking the nonlinearity of governor deadband and the automatic generation control (AGC) into considerations. Firstly, the ultra-low frequency oscillations occurred in actual power grids are discussed in...

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Bibliographic Details
Main Authors: CHEN, Yiping, XIAO, Liang, GAO, Qin, ZENG, Kehan, SHE, Shengjing, YANG, Rongzhao
Format: Conference Proceeding
Language:English
Subjects:
Eigenvalue Analysis
Frequency Mode
Frequency Oscillation
Piecewise Linearization
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Summary:A piecewise linearization model is developed for the analysis of ultra-low frequency oscillation, taking the nonlinearity of governor deadband and the automatic generation control (AGC) into considerations. Firstly, the ultra-low frequency oscillations occurred in actual power grids are discussed in depth. Then, based on the piecewise linearization model developed, the AGC-excited frequency mode is calculated and key factors that influence the frequency stability are analyzed using the eigenvalue approach. Results show that the governor deadband introduces a frequency mode that likely to be excited by large frequency bias coefficient B of the AGC system. To avoid this frequency oscillation, it is advised that B should be properly tuned under the situation when only the secondary frequency regulation is activated.
ISSN:1944-9933
DOI:10.1109/PESGM41954.2020.9282099