双馈风机不同模型下系统阻尼特性对比分析

The Comparison Study of System Damping Characteristics in Different Models of Doubly Fed Induction Generators

摘要: 本文首先介绍了双馈风机的详细模型，其详细模型包括电机部分的模型、转子侧换流器控制部分模型以及电网侧换流器控制部分模型。然后对双馈风机的详细模型进行不同程度的简化以对其进行降阶。其简化模型包括：1) 忽略电网侧变换器控制作用，即认为其控制为理想情况；2) 在(1)的基础上忽略转子磁链的暂态过程，即所谓的零轴模型；3) 忽略所有控制作用的负阻抗模型，即用一个恒定的阻抗代替双馈风机。最后以新英格兰10机39节点系统为例，对比分析了双馈风机采用详细模型及不同简化模型时系统的阻尼特性。分析结果表明，相对于详细模型，双馈风机的不同的简化模型得到的振荡模态的误差不尽相同，模型越详细，误差越小；忽略网侧变换器与零轴模型这两种简化模型所得的结果偏差较小，可以在一定程度上代替详细模型对系统进行阻尼特性分析。

Abstract: The detailed model of DFIG, which includes the model of turbine, the model of rotor side control (RSC) control and the model of grid side converter (GSC) control. Then the detailed modes are reduced to the different degree to get the reduced modes. The reduced models include three different kinds: neglecting the effect of GSC control, which means that the GSC control is an ideal one; neglecting the effect of rotor transient based on the former kind; neglecting all the dynamic effects of DFIG, which are equivalent to the negative impedance. At last, the 10-generator 39-bus New Englandsystem is studied to analyze the damping characteristics of detailed model and different reduced models. The results show that: different models have different deviations of the oscillation mode; the more reduced of the model, the bigger error of the result. To a degree, the reduced models of neglecting GSC control and the zero-axis model can be used to replace the detailed model to analyze the damping characteristics of system.