计及风速条件的风电场谐波建模与分析

Modeling and Analysis of Harmonics in Wind Farms Considering Wind Speed

以风能为代表的新能源大规模接入电网将导致严重的电能质量问题,其中以谐波影响较为突出。双馈式风力发电机组作为一种特定的谐波电源对电网的影响较大,因此,针对不同风速变化导致的风力发电机组谐波输出不同,基于实测数据采用诺顿(Norton)模型进行建模分析,并根据不同工况下的运作情形进行谐波源模型的归纳,建立不同风况下谐波干扰模型库,最后通过Matlab/Simulink搭建双馈式风力发电机组并网的仿真模型,通过仿真结果的FFT分析对比,证明所建立的不同风况下谐波源模型的准确性。

The large-scale integration of new energy represented by wind energy into the power grid might bring about severe power quality problems,among which harmonics is more prominent influence factor.As a specific harmonic power source,doubly-fed wind turbine presents a great impact on the power grid.Therefore,in allusion to the different output harmonics of wind turbine caused by different wind speed changes,a Norton model is adopted for modeling and analysis based on the measured data,and the harmonic source model is summarized according to the operation conditions under different working conditions,based on which a bank of harmonics interference models under different wind conditions.Finally,Matlab/Simulink is used to build simulation models for grid-connected doubly-fed wind turbines.FFT analysis and comparison of simulation results proves the accuracy of harmonic source models established under different wind conditions.