基于MATLAB的单相SPWM电压型逆变电路的谐波分析+电路图
毕业论文关键词：SPWM；单相逆变；谐波分析；MATLAB
Abstract With the rapid development of power electronic technology, the application of all kindsof circuits and systems with power electronic devices in power system, industry, transportati-on and family is gradually universal,for example, the PWM voltage type inverter technologyis also widely used in aviation, navigation, power, railway transportation and many otherfields. We all know,when a PWM voltage type inverter connected to the grid ,it will causeharmonics, which can affect the power quality, so harmonics and the hazards caused by themincreasingly draw more and more people's attention, according to the analysis of its harmonicsof the inverter circuit, there will be a more detailed understanding and a grasp of the characte-ristics and components of the harmonics, which has a very important significance to decreaseand suppress the harmonics.Based on the single-phase SPWM voltage type inverter circuit,this airticle has chosen theSPWM control method,which is the most representative in PWM control technology,and sinewave as the modulation wave, isosceles triangle wave as the carrier wave. According to thebasic theory of PWM control technology and Fourier series,firstly making theoretical analysisfor the harmonics contained of the output voltage of single-phase SPWM unipolar and bipolarinverter circuits,and getting the general regularities of the distribution of the harmonics. Thenusing the computer technology and the basic modules of MATLAB/Simulink comprehensiv-ely, we can establish the simulation models of the two kinds of inverter circuits, as well asgetting the time-domain graphs of the output voltage of its corresponding circuit. On thisbasis, then using the FFT Analysis to obtain the corresponding frequency-domain graphs andmake analysis to verify the correctness of the above theoretical analysis. At the same time,wecan change some parameters,such as the modulation and carrier to noise ratio, then observeand analyse the corresponding frequency content to study the influence of these parameters toharmonics,then draw a conclusion. finally,completing the harmonic analysis of the circuits.
Keywords:SPWM; Single-phase inverter;Harmonic analysis;MATLAB
目 录
第一章 绪论-1
1.1 选题的背景与意义1
1.2 逆变技术的发展与应用2
1.2.1 逆变技术的发展史与不足2
1.2.2 逆变技术的利用3
1.3 谐波分析的相关说明3
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