双馈风电机组系统耦合性分析

由于双馈风电机组系统的高阶性、非线性和强耦合性,使得分析双馈风电机组的复杂动态特性较为困难。为研究双馈风电机组系统内部变量的耦合特性,先建立计及了锁相环及转速控制器的详细小扰动模型,并利用模态分析方法对双馈风电机组系统暂态过程的多时间尺度特性做出解释。在双馈风电机组系统部分状态变量发生小扰动的情况下,分析并解释了系统内相关变量的变化趋势,在此基础上得出部分状态变量之间的弱耦合关系,对建立能够反映内部复杂动态特性的更为准确的简化模型具有借鉴作用。

Coupling Analysis of Doubly-fed Induction Generators System

Due to its high-order,nonlinear,and strong coupling characteristics,it is difficult to analyze the complex dy?namic characteristics of a doubly-fed induction generators(DFIG)system.To study the coupling characteristics of inter?nal variables in the DFIG system,a detailed small-disturbance model is established with the consideration of phaselocked loop and the speed controller at first.Then,the multi-time scale characteristics of the DFIG system in the tran?sient process are explained by using the modal analysis method.In addition,the variation trends of relevant variables in the system are analyzed and explained in the case of part of the DFIG system’s state variables under small disturbances.On this basis,the weak coupling relation between part of the state variables is obtained,which can be used as reference for establishing a more accurate simplified model that can reflect the internal complex dynamic characteristics.