Mechanism Analysis of Wide-Band Oscillation Amplification for Long-Distance AC Transmission Lines

Ning Li, Chen Fan, Yudun Li, Biao Jin, Xuchen Yang and Yiping Yu ()
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Ning Li: School of Electrical and Power Engineering, Hohai University, Nanjing 210098, China
Chen Fan: China Electric Power Research Institute, NARI, Road No.8, Nanjing 210003, China
Yudun Li: Research Institute, State Grid Shandong Electric Power Co., Ltd., Jinan 250003, China
Biao Jin: School of Electrical and Power Engineering, Hohai University, Nanjing 210098, China
Xuchen Yang: School of Electrical and Power Engineering, Hohai University, Nanjing 210098, China
Yiping Yu: School of Electrical and Power Engineering, Hohai University, Nanjing 210098, China

Energies, 2025, vol. 18, issue 19, 1-20

Abstract: The increasing integration of renewable energy has led to power systems characterized by a high penetration of renewable energy sources (RES) and power electronic devices (PEDs). However, wide-band oscillation phenomena caused by RES grid integration have emerged and propagated through transmission networks. Notably, large-scale renewable energy bases located in remote areas are typically connected to the main grid via long-distance AC transmission lines. These lines exhibit an inter-harmonic amplification effect, which may exacerbate the propagation and amplification of wide-band oscillations, posing significant risks to bulk power-grid stability. This paper establishes impedance models of long-distance AC transmission lines and asynchronous motors under wide-band oscillation frequencies, and derives equivalent line parameters mathematically to reveal the oscillation amplification problem of long-distance renewable energy oscillation transmission through AC transmission lines. A transfer coefficient is defined to quantify inter-harmonic current amplification. A single-machine-load model is developed in MATLAB/Simulink to validate the proposed model. Furthermore, the influence of line parameters on oscillation amplification is analyzed, and a suppression strategy is proposed. This study provides valuable insights for the parameter design of long-distance transmission lines in renewable energy integration scenarios, as it helps mitigate potential inter-harmonic amplification risks by reducing the peak values of the transfer coefficient.

Keywords: wide-band oscillation; harmonic transmission; long-distance AC transmission line; oscillation amplification (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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