含主动轴系扭振阻尼的并网双馈风电场惯量控制方法

电网中风电容量的增加,使得电力系统等效惯量减小、频率稳定性下降。为避免此风险,各国电网并网导则要求大规模风电场参与系统调频,并能提供类似同步发电机的惯量响应。本文基于时域仿真并辅以特征值分析,研究了风电场惯量控制对风电机组及电力系统运行特性的影响。传统的风电场惯量控制方法有益于电力系统频率稳定,但仿真结果揭示该控制会减小风电机组轴系扭振的阻尼,严重时将导致机组转速振荡失稳。为解决此问题,提出了含主动轴系扭振阻尼的风电场惯量控制方法,在满足并网导则有关惯量控制要求的同时可有效避免机组发生轴系扭振失稳。仿真结果验证了控制方法的有效性。

Inertia Control of the Grid Connected Doubly Fed Induction Generator Based Wind Farm with Drive-Train Torsion Active Damping

The power system equivalent inertia and the frequency stability decline with the increasing penetration level of wind generation. To remedy this situation, many countries have put forward grid codes which require large-scale wind farms to participate in the system frequency regulation and provide inertial responses as synchronous generators do. Through time-domain simulations and additional eigenvalue analysis, the impacts of wind farm inertia control on the wind generation system and on the power system operating characteristics have been studied. The traditional wind farm inertia control is beneficial to the system frequency stability. However, the simulation results indicate that the inertia control reduces damping of the drive-train torsional mode, which may lead to speed oscillation instability. To solve this problem, the inertia control involving active damping for the drive-train torsional oscillation is proposed. The proposed control facilitates the wind farm to fulfill the grid code requirement regarding the inertia control and suppresses the drive-train torsional oscillation. The simulation results validate the effectiveness of the proposed control.