双馈型风电场详细模型建模方法

提出一种双馈型风电场详细模型的建模方法。所建立的模型可体现风场内每一台风机以及集电系统的电磁暂态过程。该建模方法利用元件连接法(CCM)的思路,首先将风机、集电线路及变压器等视为分立元件,并建立各个元件的详细模型。再根据CCM元件连接规则连接各元件,构成风电场的详细模型。利用该建模方法能够获得系统的非线性微分方程,便于后续利用非线性系统理论进一步对系统展开分析。此外,该模型建立在dq坐标系,稳态时各物理量均为直流,借助线性化工具,可方便地获得风电场在某稳态工作点处的线性化矩阵。通过对比仿真验证了该建模方法的准确性。

An Approach to Establish Detailed Model of DFIG Based Wind Farm

This paper proposes an approach to establish detailed model of double-fed induction generator (DFIG) based wind farm. The model reflects the electromagnetic transient of each individual wind turbine and the collection system inside the wind farm. Principle of components connection method (CCM) is used in this approach. Detailed models of components inside the wind farm, including wind turbines, line impedances and transformers, are firstly built and then connected based on the specific rules of CCM. With the proposed approach, the nonlinear differential equations of wind farm can be obtained, which can be used to further analyze the system. Moreover, the proposed model is established on the dq frame and hence small signal analysis can be easily achieved via linearizing toolbox. Feasibility of the proposed modelling method is verified via simulations.