含主动频率支撑风机的电力系统分区频率响应模型

System Distributed Frequency Response Model for Wind Turbines with Active Frequency Support

  • 摘要: 随着高比例新能源的持续接入,电力系统惯量不断降低,频率稳定问题日益凸显。含主动频率支撑的风机可以改善系统调频能力,但也导致系统频率响应在空间上分布不均匀。为了分析扰动后系统频率的空间分布特性,提出了一种含主动频率支撑风机的电力系统分区频率响应模型。首先,给出不同风速下风机的主动频率控制策略,建立了适用于全风况的系统频率响应模型。其次基于K-means聚类法将电力系统划分为不同区域,并分区构建系统频率响应模型。然后以联络线功率为媒介将各区域模型进行拼接,构建了含主动频率支撑风机的系统分区频率响应模型。最后,在Matlab/Simulink中搭建仿真算例,对不同扰动位置下的系统频率响应进行分析。结果表明,含主动频率支撑风机的系统分区频率响应模型能够准确获得扰动后不同区域的频率响应特性。

     

    Abstract: With the continuous integration of high-proportion renewable energy sources, the diminishing inertia of the power system has brought the frequency stability issue into sharper focus. Wind turbines equipped with active frequency support can enhance the system's frequency regulation capability but also introduce spatially uneven distribution of the system's frequency response. To analyze the spatial distribution characteristics of the system's frequency after disturbances, a system distributed frequency response (SDFR) incorporating active frequency support wind turbines is proposed. Initially, active frequency control strategies for wind turbines under different wind speeds are presented, establishing a system frequency response model applicable across all wind conditions. Subsequently, utilizing the K-means clustering method, the power system is distributed into several regions, with regional frequency response models constructed accordingly. Then, by utilizing transmission line power as a medium, the frequency response models are integrated to form a SDFR model incorporating active frequency support wind turbines. Finally, simulation examples are developed on the Matlab/Simulink to analyze the system's frequency response under different disturbance scenarios. The results demonstrate that the SDFR model incorporating active frequency support wind turbines accurately captures the frequency response characteristics of various regions following disturbances.

     

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