Synchronization is the key of AC power system operation, but its mechanism becomes unclear with the large-scale integration of voltage-source converters (VSCs). As an important feature distinguishing VSCs from synchronous generators (SGs), the current-source characteristics of VSCs have hardly been focused from the perspective of synchronization. In this letter, a synchronization mechanism between power-synchronized voltage-source (VS) and PLL-controlled current-source (CS) is clarified. Based on this mechanism, negative damping oscillations of SGs caused by VSCs are disclosed.

中文翻译：

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电源同步 VS 和 PLL 控制的 CS 之间的同步机制以及由此产生的振荡

同步是交流电力系统运行的关键，但随着电压源转换器（VSC）的大规模集成，其机制变得不明确。作为区分 VSC 与同步发电机 (SG) 的重要特征，VSC 的电流源特性几乎没有从同步的角度关注。在这封信中，阐明了功率同步电压源 (VS) 和 PLL 控制的电流源 (CS) 之间的同步机制。基于此机制，揭示了由 VSC 引起的 SG 的负阻尼振荡。