An Analytical Model for Frequency Nadir Prediction Following a Major Disturbance

The frequency nadir is a significant indicator for the primary frequency response monitoring and control. It is imperative to predict the maximum frequency deviation and the time at which the maximum occurs with high efficiency and accuracy following a major disturbance. To develop an analytical mod...

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Bibliographic Details
Published in:IEEE transactions on power systems 2020-07, Vol.35 (4), p.2527-2536
Main Authors: Liu, Liu, Li, Weidong, Ba, Yu, Shen, Jiakai, Jin, Cuicui, Wen, Kerui
Format: Article
Language:English
Subjects:
Accuracy
Analytical models
Computational modeling
Decoupling
Frequency deviation
Frequency nadir
Frequency response
Generators
Governors
Iterative methods
Mathematical analysis
Mathematical model
Mathematical models
maximum frequency deviation
Polynomials
power deficit
Prediction models
Predictive models
primary frequency response
Time-frequency analysis
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Summary:The frequency nadir is a significant indicator for the primary frequency response monitoring and control. It is imperative to predict the maximum frequency deviation and the time at which the maximum occurs with high efficiency and accuracy following a major disturbance. To develop an analytical model for the frequency nadir prediction, the closed-loop is broken and a parabolic frequency deviation is input for decoupling the calculation of governor response and frequency deviation. Following which, the polynomial fitting is adopted to depict the primary frequency response characteristic of each governor. The iterative numerical solution for the frequency nadir prediction model is carried out based on the insight into the features of governor response. Case studies are presented to verify the performance of the analytical model over WSCC 9-bus system, New England 39-bus system and practical provincial power system, where the frequency nadir prediction model demonstrates its advantages of easy implementation, minimum computation, and high accuracy.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2019.2963706