Simulation Study on the Suppression Effect on Secondary Arcs Based on Online Injection Power Compensation

Abstract

The issue of secondary arc in ultra-high voltage transmission lines poses a significant threat to power system stability. This paper proposes a novel approach to mitigate the perniciousness of secondary arc by employing injection power compensation. The method integrates an evolution model that encompasses arc dynamics and an injection power compensation model. Through rigorous validation, the effectiveness of this method has been demonstrated. Furthermore, the impact of key factors, namely, initial recovery voltage gradient, fault location, line length, and injection power compensation delay time on the suppression effect has been analyzed. The results reveal that the injection power compensation-based method reduces the recovery voltage by 24.7% and shortens the average arc duration along the transmission line under 600 km by 22% compared to two groups utilizing high-speed grounding switches. Notably, fault location demonstrates a trend where the effect is superior at both ends of the line. The enhancement of other factors diminishes the suppression effect. Although the proposed method shows promise, further practical research is warranted to fully validate its feasibility.