Matlab面向新能源应用的异步电机动态热力学分析与研究
本文首先分析了风电机组的组成及其原理，随后以双馈异步风力发电机为研究对象，在Matlab上建立了发电机仿真模块和风电机组的整机仿真程序。考察了不同风况下双馈异步电机的电参数变化情况，计算出对应的损耗值，并将损耗值导入Motor-CAD，以此来仿真异步电机内部发热特性。在此基础上，本文分别比较了定子绕组匝间短路和三相电压不平衡两种故障情况，通过在Matlab中建立故障模型，分析了相应的电机发热情况，结果显示两种情况下转子表面和齿部的温升均较为显著。本文不仅为风电机组内部发电机热分析提供了有用的方法，而且为其故障诊断的研究做了进一步的尝试。34077
关键词 双馈异步电机 热分析 定子绕组匝间短路 三相电压不平衡
毕业论文设计说明书外文摘要
Title Thermodynamic analysis and research of asynchronous Machine oriented to new energy application
Abstract
Generator is an important component of the wind power generation system. As a measurable physical quantity,temperature plays an important role. The running status of components of wind power generation system can be achieved by monitoring the change of temperature.
This paper firstly analyzes the composition and principle of the wind power generation system,then takes doubly-fed induction generator(DFIG)for example and builds DFIG simulation module as well as wind power generation system simulation module based on Matlab.The change of DFIG electrical parameters under different wind conditions is studied.The generator loss values are computed and imported to Motor-CAD,to simulate internal heat generation characteristic of induction generator.
In addition,this paper discusses two faults:stator winding inter-turn short circuit and three-phase voltage unbalance,builds the fault models based on Matlab,and analyzes heating circumstances of generator. The result indicates that rotor surface and tooth have obvious temperature rise on both conditions.This paper proposes a useful method for thermal analysis of DFIG in wind turbine and provides insights for its fault diagnosis.
Keywords DFIG，Thermal analysis，fault simulation
目 次
1 绪论 1
1.1 研究背景及意义 1
1.2 国内外研究现状 1
1.3 风力发电系统介绍 3
1.4 本文主要研究内容 4
2.风电机组的建模与仿真 5
2.1 DFIG的建模 5
2.1.1 abc/dq坐标变换 5
2.1.2 DFIG的工作原理 6
2.1.3 DFIG的数学模型 7
2.1.4 DFIG在Simulink上的建模 9
2.2 风电系统其他部分的建模 10
2.2.1 风力机建模 10
2.2.2 最大功率跟踪 12
3 电机热分析介绍 15
3.1 传热学基本理论 15
3.2 电机内的损耗 16
3.2.1 基本铁耗 16
3.2.2 空载时铁芯中的附加损耗 17
3.2.3 电气损耗 17
3.2.4 负载时的附加损耗 17
3.2.5 机械损耗 17
3.3 Motor-CAD软件介绍 18
4 基于Matlab/Motor-CAD的联合仿真 19
4.1 Matlab侧仿真 19
4.1.1 恒风速正常情况 19
4.1.2 变风速正常情况 20