摘要随着电力电子技术的不断发展，交流电动机变频调速技术日趋完善，变频器由于其优良的调速性能和显著的节能效果使用的范围越来越广，然而随着电动机变频调速技术的发展，逆变电路输出侧产生高次谐波使得谐波污染越来越严重，对其负载和周围电气装置产生的负面影响正越来越引起人们的关注。论文首先对变频器的基本构造及其发展现状进行了详细的分析，并用SPWM技术对电压型变频器的谐波进行分析，最后用MATLAB建立了变频器系统，对变频器的谐波问题进行仿真并且采用不同方法对变频器谐波进行分析，进而提出抑制谐波的方法。仿真结果表明：在变频器输入侧加入滤波电感可以有效滤波，在输出侧加入LC滤波器对谐波抑制有明显的作用，LR滤波器则效果不佳。65007

毕业论文关键词  变频器  谐波分析  FFT   仿真

毕业设计说明书（论文）外文摘要

Title  Harmonic Analysis and the  Suppressing  Method of  Inverter                                            

Abstract With the continuous development of power electronics technology, AC motor frequency control technology maturing, the inverter because of its excellent speed performance and significant energy savings using the increasingly wide range, but with the motor frequency control technology , the output side of the inverter circuit high harmonic generation makes harmonic pollution is getting worse, its load and around the negative impact of electrical devices is increasingly a cause for concern.Firstly, the basic structure of the inverter and the development of a detailed analysis of the current situation, and use of the voltage inverter SPWM technology harmonic analysis, and finally Matlab simulation used to establish a drive system, the inverter harmonic problems simulation and study of various parameters on the inverter harmonics, then put forward a method to suppress harmonics.Paper Simulation results show that: the input side of the inverter can be effectively added to the filter inductor filter, LC filter on the output side to join the harmonic suppression has an obvious role, LR filter is ineffective.

Keywords  Inverter   Harmonic analysis   FFT   Simulation

目  录

1 绪论 1

1.1课题研究的背景及意义 1

1.2国内外变频器谐波分析与抑制研究现状 4

1.3 论文的主要工作 6

2 变频器谐波分析基础 7

2.1 傅里叶级数 7

2.2 SPWM控制技术 10

2.3 谐波的影响 12

2.4 谐波抑制标准 13

2.5变频器主电路 14

2.6 变频器谐波分析参数 15

2.7 本章小结 17

3系统的建模仿真 18

3.1 MATLAB仿真软件介绍 18

3.2变频器调速系统的等值电路分析 18

3.3三相交流逆变电路的建模 21

3.3 本章小结 33

4 变频器谐波抑制方法