风电场邻近同步调相机暂态稳定性分析与控制

Transient Stability Analysis and Control of Synchronous Condensers Deployed Adjacent to Wind Farms

中文关键词:同步调相机  风电场  暂态稳定性  低电压穿越  反馈线性化

keywords:synchronous condenser  wind farm,transient stability  low voltage ride through  feedback linearization

中文摘要:同步调相机可增强风电场短路比，但其面临着暂态功角失稳的挑战。首先，建立风电场-同步调相机联合系统的暂态稳定分析模型；其次，研究风电场低电压穿越（low voltage ride through，LVRT）控制对同步调相机转子动态的影响，据此揭示2种不同暂态功角失稳场景，并推导出场景触发的临界条件。最后，基于反馈线性化方法设计附加控制器，通过动态调整故障后风电场的输出功率，在提升同步调相机暂态稳定性的同时确保风电场出力恢复。仿真结果表明：邻近新能源的同步调相机存在首摆、二摆失稳2种功角失稳形态，所提控制方法可有效抑制这2种失稳情况，并保障新能源电流在故障清除后快速恢复。

Abstract:Synchronous condensers can enhance the short-circuit ratio of wind farms but face the challenge of transient power angle instability. First，a transient stability analysis model for the wind farm-synchronous condenser hybrid system is established. Second，the impact of wind farm low-voltage ride-through control on the rotor dynamics of synchronous condensers is examined，revealing two distinct transient power angle instability scenarios and deriving the critical conditions that trigger these scenarios. Finally，an additional controller is designed based on the feedback linearization method. This controller dynamically adjusts the output power of the wind farm after a fault，thereby improving the transient stability of the synchronous condenser while ensuring the recovery of wind farm output. Simulation results indicate that synchronous condensers adjacent to new energy sources exhibit two power angle instability modes： first-swing instability and second-swing instability. The proposed control method can effectively suppress both instability conditions and ensure the rapid recovery of new energy current after fault clearance.