双馈风电机组的通用型机电暂态模型及其 电磁暂态模型的对比分析

针对风力发电系统的电磁暂态模型复杂、计算速度慢的问题,研究了一种风力发电系统的通用性机电暂态模型。该模型不包含电力电子器件,由纯粹的数学计算完成,模型简单、计算速度快。该机电暂态模型分为风速模型、风力机及其控制模型、发电机/变流器模型、电气控制模型四部分。在PSCAD对该机电暂态模型进行了仿真,得到的结果与电磁暂态模型的仿真结果吻合,且仿真时间大大减少,验证了该模型在保证一定计算精度的前提下大大提高了计算速度。该通用性机电暂态模型为大规模并网风电场的仿真建模提供了模型参考,具有实用价值。

Comparative study on electromechanical and electromagnetic transient model for grid-connected DFIG

The computing speed of electromagnetic transient model for wind power system is very slow because of its complexity. To solve this problem, a general electromechanical transient model is studied, in which there are not electrical components and high frequency switching device, and it only consists of pure mathematic calculations, is simple and has fast calculation speed. There are four parts including wind speed model, wind turbine control, generator/convertor model, and electrical control model. By comparing the simulation results of this electromechanical transient model with electromagnetic transient model in PSCAD, we found that the simulation time is reduced greatly and the results are agreeable basically, the simulation efficiency can be increased significantly at the same time guarantee the accuracy of the calculation accuracy. The electromechanical transient model provides reference model for simulation and modeling of large scale grid-connected wind farm and is of great practical value.