Identification of grid-connected units with the weakest small‑signal stability in multiple renewable energy stations based on generalized Nyquist criterion

doi:10.19781/j.issn.1673-9140.2024.05.014

Home > Archive>Volume 39, Issue 5, 2024 >129-140. DOI:10.19781/j.issn.1673-9140.2024.05.014

Identification of grid-connected units with the weakest small‑signal stability in multiple renewable energy stations based on generalized Nyquist criterion
DOI:
                        10.19781/j.issn.1673-9140.2024.05.014
                    
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                        CHEN Bo1,6CHEN Bo
Electric Power Research Institute, State Grid Jiangxi Electric Power Co., Ltd., Nanchang 330096, China; Jiangxi New Energy and Storage Safety Operation Control Engineering Research Center， Nanchang 330096, China
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SI Qi2SI Qi
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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CHEN Yanhong3CHEN Yanhong
State Grid Jiangxi Electric Power Co., Ltd., Nanchang 330077, China
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TAO Xiang1,6TAO Xiang
Electric Power Research Institute, State Grid Jiangxi Electric Power Co., Ltd., Nanchang 330096, China; Jiangxi New Energy and Storage Safety Operation Control Engineering Research Center， Nanchang 330096, China
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WANG Kai3WANG Kai
State Grid Jiangxi Electric Power Co., Ltd., Nanchang 330077, China
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ZHU Xiaojuan2ZHU Xiaojuan
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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WU Zhiping4WU Zhiping
New Energy Power Generation Branch, State Power Investment Group Jiangxi Electric Power Co., Ltd., Nanchang 330038, China
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ZHANG Yongsheng5ZHANG Yongsheng
Huaneng Jiangxi Clean Energy Co., Ltd., Nanchang 330038, China
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Affiliation:(1.Electric Power Research Institute, State Grid Jiangxi Electric Power Co., Ltd., Nanchang 330096, China; 2. School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China; 3.State Grid Jiangxi Electric Power Co., Ltd., Nanchang 330077, China; 4.New Energy Power Generation Branch, State Power Investment Group Jiangxi Electric Power Co., Ltd., Nanchang 330038, China; 5.Huaneng Jiangxi Clean Energy Co., Ltd., Nanchang 330038, China; 6.Jiangxi New Energy and Storage Safety Operation Control Engineering Research Center， Nanchang 330096, China)
Clc Number:TM712
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Abstract:

The integration of a large number of renewable energy grid-connected converters into the power grid can easily trigger small-signal instability, posing a serious threat to the safety and stability of the system. The existing small-signal stability analysis using the impedance method, based on a multi-machine equivalent mechanism, can only provide an analysis of the factors influencing stability and cannot identify the key weak grid-connected units that affect stability. This paper proposes a method for identifying small-signal stability weak grid-connected units in a renewable energy multi-site system based on the generalized Nyquist criterion (GNC). Firstly, based on the stability analysis approach of GNC, multiple renewable energy sites with different control parameters are decoupled into multiple single-site subsystems. Then, a stability criterion is constructed for each subsystem to analyze the small-signal stability of each subsystem. Finally, the subsystem with the weakest stability is identified based on the small-signal stability of each subsystem. The research results show that, compared with existing methods, this method can more accurately and quickly identify small-signal stability weak grid-connected units, providing targeted guidance and suggestions for improving system stability

Key words:grid-connected converter;multiple renewable energy stations system; small-signal stability; grid-connected units with small-signal stability weakest;generalized Nyquist criterion

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陈波,斯琪,谌艳红,陶翔,王凯,朱晓娟,吴志平,张永生.基于广义奈奎斯特判据的新能源多场站系统小信号稳定薄弱并网单元辨识[J].电力科学与技术学报英文版,2024,39(5):129-140. CHEN Bo, SI Qi, CHEN Yanhong, TAO Xiang, WANG Kai, ZHU Xiaojuan, WU Zhiping, ZHANG Yongsheng. Identification of grid-connected units with the weakest small‑signal stability in multiple renewable energy stations based on generalized Nyquist criterion[J]. Journal of Electric Power Science and Technology,2024,39(5):129-140.

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Online: December 02,2024
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