双馈电动机调速系统控制策略的研究和仿真毕业论文

摘要 目前，双馈电机最大的优点在于可以将转差功率馈送至电网中，或者是由电网馈入。双馈电动机调速系统由于具有可靠性高、成本低等优点，并且能够通过调节转子侧变频器的幅值、相位以与频率来调节双馈电动机定子侧无功功率，因此被广泛应用于沟通电机调速领域。 本文主要讨论双馈电动机调速系统控制策略与其仿真。本文首先简单地介绍了双馈电动机调速系统的基本工作原理，分析、讨论了双馈电动机在不同工况下运行时的功率流动关系，接着详细地推导出双馈电动机在三相静止坐标系上的数学模型。然后采纳定子磁链定向，推导出双馈电动机在同步旋转坐标系 MT 上的数学模型。本文采纳双馈电动机转速与定子侧无功功率作为外环控制目标、转子电流在 M、T 轴上的重量作为环控制目标的双闭控制系统。该控制策略能够独立地调节双馈电动机转速与定子侧无功功率，且能够实现双馈电动机在次同步、超同步状态下运行。然后在 MATLAB 中的 simulink 环境下搭建了双馈电动机调速系统的仿真模型并进行仿真分析，验证了所用控制策略的可行性。关键词：双馈电动机，矢量控制，仿真AbstractAt present, the biggest advantage of doubly-fed electric machine is that it can make the slip power feed to the grid, or eed it from grid. The double-fed electric machine speed control system has high reliability and low cost advantages, and it can change the double-fed electric machine stator side reactive power by adjusting the amplitude, phase and frequency of the rotor side converter, so it is widely used in the field of motor control. This paper mainly studies the control strategy of double-fed electric machine speed control system and its simulation.This paper first briefly describes the basic working principle of the double-fed electric machine speed control system, analyzes and discusses the power flow of the doubly-fed electric machine in the run-time under different conditions ,then deduces the mathematical model of the doubly-fed electric machine in three-phase stationary coordinatesystem in detail.It uses the double-lo...