An Online Prediction Model of Power System Frequency Nadir Based on Polynomial Fitting of Power-frequency Characteristics

被引：0
|
作者：
Yang S. [1 ]
Meng Q. [1 ]
Zhang Y. [1 ]
Hao Z. [1 ]
He J. [2 ]
机构：
[1] State Key Lab of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Shaanxi Province, Xi’an
[2] State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems, China Electric Power Research Institute, Haidian District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2022年 / 42卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
frequency nadir; frequency response model; online frequency prediction; polynomial fitting; renewable energy power system;
D O I：
10.13334/j.0258-8013.pcsee.221809
中图分类号：
学科分类号：
摘要：
It is essential to the safe and stable operation of low-inertia power systems to accurately predict the frequency nadir and evaluate the transient frequency stability after a large disturbance occurs. An online prediction model of frequency nadir was proposed in this paper for future power systems highly penetrated with renewable energy sources. Firstly, the non-linear response characteristics of synchronous generator’s governor were analyzed. It is found that the governor’s power-frequency response curve can be fitted by high-order polynomial, by which the differential equations can be simplified to algebraic equation. Then the frequency characteristics of renewable energy generation and loads were taken into consideration, and a second-order polynomial was constructed to describe the system-level power-frequency response. Finally, the analytical expression of frequency nadir was derived based on the simplified power-frequency response model. The accuracy and effectiveness of the proposed prediction model was verified in 3-machine 9-bus system, modified IEEE 39-bus power system and East China power grid. ©2022 Chin.Soc.for Elec.Eng.
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页码：115 / 125
页数：10
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