改善系统暂态稳定性的变速风电机组线性自抗扰控制器

Linear Active Disturbance Rejection Controller for Variable-speed Wind Turbine to Improve System Transient Stability

基于线性自抗扰控制理论设计了一种改善系统暂态稳定性的变速风电机组稳定控制器。针对每一座风电场,根据其对同步机组的可控能力划分出各风电场的可控机群,并将可控机群聚合转化风电场等效可控系统。基于该等效可控系统,利用线性自抗扰控制理论设计了风电场稳定控制器。得益于线性自抗扰控制中的扰动实部估计和补偿功能,控制器无需同步机组和风电场详细模型信息,同时还对系统运行方式变化具有良好的适应性。控制器具有分散协调的特性,无需风电控制中心协调。在改进的IEEE 39节点系统中的仿真算例验证表明了设计的控制器能够有效增强系统同步稳定性,同时对系统运行方式变化具有良好的适应性。

Based on linear active disturbance rejection control （LADRC）, a controller for variable speed wind generator （VSWT） is proposed to improve the transient stability of the power system. According to the controllability of wind farm on synchronous generators, some of synchronous generators are divided into the wind farm equivalent controllable generator group （WFECGG）, and WFECGG is transformed into a wind farm equivalent controlled system （WFECS）. Then, based on the model of WFECS, a wind farm controller is designed based on LADRC. Due to the real-time estimation and compensation of the perturbation, the controller does not need the exact model information of the synchronous generator and VSWT, and meanwhile it has good adaptability to the variation of operation mode. The controller has the character of decentralized coordination without wind farm center coordination. The simulation cases carried on the modified IEEE 10-generator 39-bus system verify the effectiveness of the proposed controller on enhancing the synchronous stability, and meanwhile it has the good adaptability to the variation of system operation mode.