The synchronization instability in the presence of a fault is a main issue for the dynamic behavior and control of grid-feeding converters. In the literature, the synchronization stability assessment is carried out considering the dynamics of Phase-Locked Loops (PLL) but the transients of converter currents are neglected. The letter shows that such a simplification leads to inaccuracies and, thus, the current transients cannot be neglected. The letter proposes a model that captures the effect of such current transients on the converter synchronization. This model allows assessing the transient behavior and, hence, the stability, of power electronics converters with high accuracy, comparable, in fact, to EMT models. The fidelity of the proposed model is duly discussed in the case study.

中文翻译：

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电流瞬变对电网馈电转换器同步稳定性评估的影响

存在故障时的同步不稳定性是电网馈电变流器动态行为和控制的主要问题。在文献中，同步稳定性评估是在考虑锁相环 (PLL) 动态的情况下进行的，但忽略了转换器电流的瞬变。这封信表明，这种简化会导致不准确，因此，不能忽略电流瞬变。这封信提出了一个模型来捕捉这种电流瞬变对转换器同步的影响。该模型允许以高精度评估电力电子转换器的瞬态行为，从而评估其稳定性，实际上可与 EMT 模型相媲美。案例研究中适当讨论了所提出模型的保真度。