风电场动态等值及其在暂态稳定分析中的应用

摘要

风力发电厂系统的完整模型建模,阶敬太高,不适合全系统在线安全分析和稳定裕度计算.提出一种风电场双馈感应发电机( DFIG)动态等值技术,即将风力发电厂中的多台DFIG发电单元等值聚合为一个发电单元,对发电单元的聚合包括风力涡轮机的聚合、双馈感应发电机聚合以及电能传输和收集系统的聚合.保留了在不同的风速下,被聚合的发电单元的主要的动态性能.聚合模型应用在电力系统在线仿真中,优化了在线分析计算时间,提高了在线计算的精确性.等值前后发电单元具有相同的模型结构.通过仿真研究,验证了动态等值方法的正确性.%A full model of wind farms Is a high order model which is not appropriate for online system security analysis and stability margin computation, A new dynamic equivalence method for wind farms with doubly fed induction generators(DFIGs) was presented. The DFIGs were aggregated to one single wind turbine unit to preserve the main dynamic characteristics under different wind speeds. The equivalent model has the same structure as the original system, which includes aggregation of wind turbines, DFIGs, energy converting systems and collector systems. The application of aggregation model to power system online simulation can optimize online computation time and improve computational accuracy. The validity of the proposed method is proved by the simulation comparison study-