Analysis for Coupling Characteristic and Weakness of &#x0201c;Source-Network-Load&#x0201d; Under Ice Storms

XIE Yigong; WU Chen; HUANG Qianqian; FANG Sidun

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Analysis for Coupling Characteristic and Weakness of “Source-Network-Load” Under Ice Storms

XIE Yigong¹, WU Chen², HUANG Qianqian³, FANG Sidun³

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Abstract

[Objective] Under extreme ice disaster weather conditions,the power generation capacity of wind and solar energy experiences a drastic decline,while the probability of power equipment failures increases significantly,leading to severe supply-demand imbalances persisting for multiple days. In order to analyze the complex interdependent relationships among source-grid-load components in high-penetration renewable energy systems during ice storms and identify vulnerable nodes prone to failure propagation,this paper investigates the temporal-spatial distribution patterns,correlations,and stochastic characteristics of source-grid-load systems under ice disaster conditions. The study reveals probabilistic features of both power supply and demand sides,establishing a probabilistic model for source-grid-load systems that incorporates key ice disaster impact factors. [Methods] Based on nonlinear dynamic system theory,we propose three novel indicators：passive/active voltage fluctuation indices for grid nodes,a composite network fluctuation index,and a node voltage violation index. A dynamic impedance matrix and source-load frequency coupling coefficient are introduced to develop an analytical framework for assessing source-grid-load coupling characteristics and vulnerability under ice disaster scenarios. This methodology enables systematic investigation of the synergistic evolution mechanisms and variation patterns within source-grid-load systems during ice events. [Results] Case studies using the modified IEEE 39-node system and a regional grid demonstrate that system-wide passive/active fluctuation indices progressively increase with enhanced nodal interdependencies. The amplified coupling effects from renewable energy fluctuations under ice storms substantially degrade grid resilience. [Conclusions] The proposed approach effectively reveals dynamic evolution patterns of source-grid-load coupling characteristics and identifies critical vulnerable nodes,providing an effective tool for in-depth research on operational characteristics and optimal dispatch strategies for power systems under ice disaster conditions.

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power system / ice disaster / dynamic impedance / electrical coupling

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XIE Yigong, WU Chen, HUANG Qianqian, FANG Sidun. Analysis for Coupling Characteristic and Weakness of “Source-Network-Load” Under Ice Storms[J]. Electric Power Construction. 0

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Funding

National Natural Science Foundation of China (No. 52377075) and the Technology Project of China Southern Power Grid Company Limited (No. 0500002023030301GH00107).