Commutation failure (CF) is one of the most common issues in line-commuted converter-based high voltage direct current systems (LCC-HVDC), leading to critical power system security and stability problems. Accurate and rapid identification of CF is crucial to prevent subsequent CF in HVDC systems. However, the existing CF identification methods are lack of the required accuracy and speed. The relationship between bridge arm current, commutation voltage, and trigger pulse based on the commutation progress mechanism after the AC fault is analysed in this paper. A novel CF identification method is presented, which utilises the CF identification factor, enabling fast and high-accurate identification without relying on the value of the extinction angle. The proposed method offers a simpler and more efficient implementation in engineering practice. Finally, the effectiveness of the proposed method is verified in both the standard International Council on Large Electric systems HVDC model and the Hardware in Loop test using practical project parameters. The results demonstrate that the proposed method can accurately and fast identify CF.

中文翻译：

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一种快速高精度的LCC-HVDC系统换相失败识别方法

换相失败（CF）是基于线路换相换流器的高压直流系统（LCC-HVDC）中最常见的问题之一，导致严重的电力系统安全和稳定性问题。准确、快速地识别 CF 对于防止 HVDC 系统中发生后续 CF 至关重要。然而，现有的CF识别方法缺乏所需的精度和速度。本文基于交流故障后的换相进展机制，分析了桥臂电流、换相电压和触发脉冲之间的关系。提出了一种新颖的CF识别方法，该方法利用CF识别因子，能够在不依赖消光角值的情况下实现快速、高精度的识别。所提出的方法在工程实践中提供了更简单、更有效的实现。最后，在标准国际大型电力系统理事会HVDC模型和使用实际项目参数的硬件在环测试中验证了该方法的有效性。结果表明，该方法能够准确、快速地识别CF。