电力系统自动化2025，Vol.49Issue(22)：55-67,13.DOI:10.7500/AEPS20250420002
改善暂态稳定性的多构网型变换器频率同步协同控制
Cooperative Frequency Synchronization Control of Multiple Grid-forming Converters for Improvement of Transient Stability
摘要
Abstract
Due to differences in parameters such as inertia,damping,and impedance of grid-forming converters operating in parallel,the transient interactions between converters are intensified,increasing the risk of transient synchronization instability of converters.Multi-machine transient stability cooperative control is key in improving the transient stability of grid-connected systems.To this end,based on the transient interaction model of a parallel grid-forming converter system,this paper reveals the multi-machine instability mechanism that may be induced by the power angle driving effect of transient interaction energy and proposes a cooperative frequency synchronization stabilization control method for multiple grid-forming converters.On one hand,the transient interaction energy is reduced through frequency synchronization control to maintain synchronous and stable operation among converters.On the other hand,by calculating the center frequency through weighted virtual kinetic energy,the acceleration energy of converters with larger virtual kinetic energy is dissipated,thereby improving the transient stability of the converters relative to the system.The improvement of system stability under the condition of the parallel system connecting to a large power grid is demonstrated using a Lyapunov energy function for the proposed control method.Furthermore,by constructing the stability region of the converter parallel system considering cooperative control,it is verified that the cooperative control method can effectively expand the system stability region,providing guidance for parameter optimization.Finally,the correctness of the proposed method is validated through simulations and experiments.关键词
暂态稳定性/构网型变换器/协同控制/频率同步/稳定域/能量函数/参数优化Key words
transient stability/grid-forming converter/cooperative control/frequency synchronization/stability region/energy function/parameter optimization引用本文复制引用
吴峰,鲍颜红,郑建勇,徐泰山,任先成,张金龙,赵溪洁..改善暂态稳定性的多构网型变换器频率同步协同控制[J].电力系统自动化,2025,49(22):55-67,13.基金项目
国家重点研发计划资助项目(2022YFB2402701). This work is supported by National Key R&D Program of China(No.2022YFB2402701). （2022YFB2402701）
