双馈感应电机的多回路数学模型及其电感参数的计算

Multi-loop Mathematical Model and Calculation of Inductances in Doubly Fed Induction Generation

为研究双馈电机正常和绕组内部故障的动态特性,本文在多回路理论的基础上,根据多回路方法确立回路选取原则,据此建立了以回路电流为独立变量的双馈电机数学模型。应用基于磁路的气隙磁导分析法,采用"绕组函数"的概念,以单个线圈作为分析单元,推导出双馈电机的电感参数简化表达式,用双馈电机正常并网工况下定子侧电流、转子侧电流和电压的仿真结果验证数学模型的正确性,并计算了双馈机发生定子绕组匝间短路故障情况时的电压、电流特性。

In order to study the dynamic characteristics of normal and winding internal fault in DFI~ the loop selecting principle was introduced based on the theory of multi-loop, and the mathematical model of DFIG was established to choose the loop current as an independent variable. Based on the air-gap permeance method, this paper accepted the concept of ＂winding function＂ and deduced the simple inductance parameter expression by means of choosing a single coil as the basic unit of the analysis. Under normal networking, the mathematical model of DFIG was validated with the simulation results of current and voltage of stator. In addition to this, also calculate the voltage and current characteristics of DFIG under stator winding inter-turn short circuit fault conditions.