This paper develops a dynamic phasor model of a line-commutated converter high-voltage direct current (LCC-HVDC) system that includes unbalanced operation and commutation failure. This model is beneficial in studying the behavior of the HVDC systems under asymmetrical faults, and it complements the conventional transient simulation-based methods. Equally, importantly, the model includes the representation of commutation failure that may arise as a result of severe faults. Due to its selectivity of the considered harmonics, the developed model has markedly less computational intensity than an electromagnetic transient (EMT) simulation model. This gives the model a distinct advantage in the study of large-signal transients of the LCC-HVDC systems, particularly where repetitive simulations are required. Validation of the proposed model is done using a detailed EMT model of the CIGRE monopolar LCC-HVDC benchmark.

中文翻译：

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LCC-HVDC 系统的动态相量建模：不平衡运行和换向故障

本文开发了一个包含不平衡运行和换向故障的线路换相转换器高压直流 (LCC-HVDC) 系统的动态相量模型。该模型有利于研究 HVDC 系统在不对称故障下的行为，它补充了传统的基于瞬态仿真的方法。同样重要的是，该模型包括可能由于严重故障而出现的换向失败的表示。由于其对所考虑谐波的选择性，开发的模型的计算强度明显低于电磁瞬态 (EMT) 仿真模型。这使该模型在 LCC-HVDC 系统的大信号瞬变研究中具有明显的优势，尤其是在需要重复仿真的情况下。