【摘要】 针对新能源电力系统中传统交流保护适应性下降问题，提出一种新型交流输电线保护方案。首先，基于新能源接入电网的典型事故案例，深入分析了工程实际中传统交流保护存在的不足；其次，通过推导短路电流与序阻抗角解析表达式，揭示了逆变型电源暂态电流及序分量的时空演化规律；最终，结合工程需求提出2种改进保护方法，有效解决传统保护的适应性问题。仿真结果表明，该方案无需增加硬件投资，即可显著提升新能源电源接入场景下交流保护的适应性。更多还原

【Abstract】 To address the declining adaptability of traditional AC protection in renewable energy power systems,this paper proposes a novel protection scheme for AC transmission lines.Firstly,based on typical fault cases in renewable-integrated grids,the shortcomings of conventional AC protection in practical engineering are thoroughly examined. Subsequently,by deriving analytical expressions for short-circuit current and sequence impedance angles,the spatiotemporal evolution characteristics of the transient current and sequence components from inverter-interfaced sources are revealed. Ultimately,two improved protection methods are proposed in line with engineering requirements,effectively resolving the adaptability issues of conventional protection.Simulation results demonstrate that this scheme significantly enhances the adaptability of AC protection in scenarios with integrated renewable energy sources,without requiring additional hardware investments.更多还原