摘要
从感应电机电磁关系出发,提出双馈异步电机(DFIG)的谐波等效电路,分析了DFIG在次同步、同步和超同步3种运行方式下发出的谐波含量,建立了DFIG概率谐波潮流计算模型,通过将风电机接入小系统产生并联和串联谐振的仿真,得到风电机发出谐波对小系统的影响。最后根据风电机发出谐波的特点,提出总谐波畸变值的概率密度函数的概念,通过概率谐波潮流计算得到各节点总谐波畸变值的概率密度函数,从而得到DFIG发出谐波对电网的影响。
Based on the analysis of the basic electromagnetic relation for the doubly fed induction generator（DFIG）, the fundamental and harmonic equivalent circuits are presented.The harmonic propagation from the stator to the rotor side and in sub-synchronous mode and super-synchronous mode is explained.The model of probabilistic harmonic load flow equivalent circuits for DFIG are presented.Then, the influence of the harmonic from DFIG to a small power sys- tem are analysed.Finally, according to the harmonic characteristics of wind turbine ,the concept of the probability den- sity function of total harmonic distortion （PDI^HD） is proposed.The impacts on power grid from harmonic propagated by DFIG are analysed by the PDFTHD of each node after the probabilistic harmonic load flow.
出处
《电力电子技术》
CSCD
北大核心
2011年第11期108-111,共4页
Power Electronics
基金
国家自然科学基金资助项目(50877069)~~
关键词
双馈异步电机
概率谐波潮流
概率密度函数
doubly fed induction generator
probabilistic harmonic load flow
probability density function
