Abstract In the multi-infeed HVDC system, the interaction between inverter stations is an important factor that triggers the propagation of commutation failure. This paper aims to study the interaction mechanism of inverter stations and propose a reasonable method to evaluate the commutation failure risk. Firstly, based on the modified switching function, the commutation failure component is formulated to describe the commutation process and transient characteristics of inverter station during the commutation failure. Then, the analytical calculation method is studied to reflect the commutation voltage fluctuation under the influence of AC fault and commutation failure. On this basis, the commutation failure risk is assessed by comparing each valve’s maximum commutation area with the minimum commutation area required for blocking. By analyzing the commutation failure risk under different grounding impedances, it is possible to identify the critical grounding inductance that causes a remote commutation failure. Based on the multi-infeed HVDC system in PSCAD/EMTDC, the validity and accuracy of the proposed method and commutation failure component are verified.

中文翻译：

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一种考虑逆变站交互作用的换相故障风险分析方法

摘要 在多馈入直流系统中，逆变站之间的相互作用是触发换相失败传播的重要因素。本文旨在研究逆变站的交互作用机制，提出合理的换流失败风险评估方法。首先，基于修正后的切换函数，构造换相失败分量来描述换相失败时逆变站的换相过程和暂态特性。然后，研究了解析计算方法来反映交流故障和换相故障影响下的换相电压波动。在此基础上，通过比较每个阀门的最大换向面积与阻塞所需的最小换向面积来评估换向失败风险。通过分析不同接地阻抗下的换相失败风险，可以识别导致远程换相失败的临界接地电感。基于PSCAD/EMTDC中的多馈入HVDC系统，验证了所提方法和换相失败分量的有效性和准确性。