标题： 重新审视电网跟随型变流器对频率动态的影响 -- 第一部分：惯性中心 显示英文标题

标题： Revisiting the Effect of Grid-Following Converter on Frequency Dynamics -- Part I: Center of Inertia

摘要： 理解电网跟随（GFL）转换器对系统频率动态的影响，从惯性中心（COI）和频率空间变化的角度来看都是至关重要的。 本系列的第一部分阐明了GFL如何影响COI频率动态的机制。 开发了一个包含GFL局部动态及其通过虚拟联络线与同步发电机相互作用的多发电机电力系统模型。 通过将多发电机模型聚合到COI框架中，揭示了COI频率与GFL等效频率之间的相互作用。 由控制参数和运行条件确定的GFL侧等效惯性和其他组件通过虚拟联络功率支持COI。 仿真验证了所提出建模的准确性，并表明GFL对COI频率的影响相对较弱。 GFL的等效惯性和其他组件仍然显著影响COI频率动态，其影响是时变且可调的。 显示英文摘要

摘要： Understanding the impact of grid-following (GFL) converters on system frequency dynamics is crucial, from both the center of inertia (COI) and frequency spatial variation perspectives. Part I of this series clarifies the mechanisms by which GFLs influence COI frequency dynamics. A multi-generator model of the power system with GFLs is developed, incorporating the local dynamics of GFLs and their interaction with synchronous generators via virtual tie lines. By aggregating the multi-generator model into the COI frame, the interaction between the COI frequency and the equivalent frequency of GFLs is revealed. The equivalent inertia and other components at the GFL side, determined by control parameters and operating conditions, support the COI through virtual tying power. Simulation validates the accuracy of the proposed modeling and demonstrates that the impact of GFLs on COI frequency is relatively weak. The equivalent inertia and other components of GFLs still significantly influence COI frequency dynamics, with their effects being both time-variable and adjustable.