The fundamental mechanism of transient stability of the conventional power system can be physically understood with the rotor swing dynamics of synchronous generators (SGs). The basic factor affecting the transient stability is the power-angle relationship among the SGs. The integration of a large number of inverter-based generations (IBGs) into the power system inevitably changes the original power-angle relationship, therefore leading to a more complicated transient stability mechanism. In this letter, the impact of IBG on the power system transient stability is analytically investigated. It is shown that the connection of IBG changes the original power-angle relationship into a nonsinusoidal curve, introduces a limit on the peak of the rotor swing, and therefore brings about a new bottleneck for the transient stability.

中文翻译：

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集成逆变器发电的电力系统暂态稳定性

传统电力系统暂态稳定性的基本机制可以通过同步发电机 (SG) 的转子摆动动力学来物理理解。影响暂态稳定性的基本因素是SG之间的功率角关系。大量的逆变器（IBG）并入电力系统不可避免地改变了原有的功率角关系，从而导致了更加复杂的暂态稳定机制。在这封信中，分析研究了 IBG 对电力系统暂态稳定性的影响。结果表明，IBG的连接将原来的功角关系变为非正弦曲线，对转子摆动的峰值引入了限制，从而给暂态稳定性带来了新的瓶颈。