【目的】为解决跟网-构网(GFL-GFM)变流器并联系统的暂态稳定问题，本文提出了一种基于惯量-阻尼动态调整的暂态稳定控制方法。【方法】首先，构建了GFL-GFM变流器并联系统的两阶段暂态控制框架，在故障初期快速投入故障电流限制器以降低过电流水平，在故障后恢复阶段动态调整GFL变流器的锁相环(PLL)与GFM变流器的惯量-阻尼参数；其次，采取Sigmoid函数实现惯量-阻尼协同整定，并通过并联系统的功角变化趋势自适应调整控制器参数；最后，基于Matlab/Simulink平台构建了GFL-GFM变流器并联系统的时域仿真模型，通过与传统控制方法的对比及在不同程度电压暂降工况下的测试，从多方面验证了所提暂态控制方法的有效性。【结果】结果表明，相较于传统GFL变流器PLL冻结与GFM变流器附加功率控制策略，所提控制方法使GFL-GFM变流器的功角振荡幅度显著降低，功角振荡周期大幅度缩短，且能良好地适应轻度和重度电压暂降工况。所提控制方法有效保证了GFL-GFM变流器并联系统在整个故障过程中的暂态稳定性，并将功率角振荡偏差降低5%以上。【结论】本文所提方法提升了GFL-GFM变流器并联系统在不同程度电压暂降下的适应性与鲁棒性，为高比例电力电子设备并网系统的稳定运行提供了新思路，具有良好的应用价值。

[Objective] To address the transient stability challenges in grid-following and grid-forming (GFL-GFM) converters parallel system, this paper proposes a transient stability control method based on dynamic adjustment of inertia-damping. [Methods] Firstly, a two-stage transient control framework was established for the GFL-GFM converters parallel system. During the fault period, fault current limiters were rapidly activated to mitigate overcurrent, while in the post-fault recovery stage, the phase-locked loop (PLL) of GFL converter and the inertia-damping parameters of GFM converter were dynamically adjusted. Secondly, the Sigmoid function was adopted to achieve inertia-damping coordination tuning, and the controller parameters were adaptively adjusted by the trend of the power angle of the parallel system. Finally, a time-domain simulation model of the parallel system of GFL-GFM converters was established based on the Matlab/Simulink platform. Through comparisons with traditional control methods and tests under voltage sag conditions of varying degrees, the effectiveness of the proposed transient control method was verified from multiple aspects. [Results] The results showed that compared with the traditional PLL freezing of GFL converter and the additional power control strategy of GFM converter, the proposed control method significantly reduced the amplitude of the power angle oscillation of GFL-GFM converters, greatly shortened the oscillation period, and adapted well to both mild and severe voltage sag conditions. The proposed control method effectively ensured the transient stability of the GFL-GFM converters parallel system during the whole fault process, and it also reduced the power angle oscillation deviation by more than 5%. [Conclusion] The proposed method enhances the adaptability and robustness of GFL-GFM converters parallel system under voltage sag of varying degrees, providing a new idea for the stable operation of grid-connected system with high proportion of power electronic equipment, which has good application value.

南方电网科技项目(GDKJXM20231387)