【摘要】 为实现“双碳”战略目标，“深远海”地区风电资源的高效汇集送出方式成为重要论题。柔性低频海上风电系统，通过降低输电频率提升输送能力，在大规模远距离海上风电输送领域具有巨大应用潜力。但是柔性低频海上风电系统的稳定性问题，尤其是大信号稳定性问题仍是工程实践的难题。该文基于T-S模糊理论，结合系统的异频耦合特性，构建了柔性低频海上风电系统的Lyapunov方程，并通过大信号稳定吸引域分析了在系统运行过程中大信号扰动工况下的稳定性。针对系统可能出现的不稳定运行工况，采用法线边界交叉法和模糊隶属函数理论，求解了计及运行效率和稳定裕度的多目标系统稳定运行方式优化问题，设计了大信号扰动下系统稳定控制策略，实现了实时在线有效规避系统可能出现的大信号不稳定风险。最后，通过时域仿真和硬件在环实验对系统大信号稳定性分析结论和稳定控制策略的有效性进行了验证。更多还原

【Abstract】 To achieve the goals of the "Dual Carbon" strategy, the efficient aggregation and transmission of wind energy resources in the "deep and far offshore" areas have become important topics. Flexible low-frequency offshore wind power systems, by reducing the transmission frequency to enhance transmission capacity, have significant potential for large-scale long-distance offshore wind power transmission.However, the stability issues of flexible low-frequency offshore wind power systems, especially the problems related to large-scale signal stability, remain challenging in engineering practice. In this paper, based on the T-S fuzzy theory and considering the system’s asynchronous coupling characteristics,the Lyapunov equation for flexible low-frequency offshore wind power systems is constructed. The stability under large-scale signal disturbances during system operation is analyzed using the domain of attraction analysis. To address the potential instability conditions of the system, the normal boundary intersection method and fuzzy membership function theory are employed to optimize the multi-objective system stability operation, considering both operational efficiency and stability margin. A system stability control strategy is designed to effectively mitigate the risk of large-scale signal instability in real-time online scenarios. Finally, time-domain simulations and hardware-in-the-loop experiments are conducted to validate the conclusions of the large-scale signal stability analysis and the effectiveness of the proposed stability operation methods.更多还原