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1、電力電子系統(tǒng)計(jì)算機(jī)仿真題目：雙極性模式PWM逆變電路班級(jí)：姓名：學(xué)號(hào)：指導(dǎo)老師：日期：29摘要PWM控制就是對(duì)脈沖的寬度進(jìn)行調(diào)制的技術(shù)。即通過(guò)對(duì)一系列脈沖的寬度進(jìn)行調(diào)制，來(lái)等效地獲得所需要的波形。PWM控制技術(shù)在逆變電路中的應(yīng)用最為廣泛，現(xiàn)在大量應(yīng)用的逆變電路中絕大部分都是PWM型逆變電路。本設(shè)計(jì)為雙極性PWM方式下的單相全橋逆變電路，主要包括雙極性SPWM控制信號(hào)的發(fā)生電路和帶反并聯(lián)二極管的IGBT作為開(kāi)關(guān)器件的單相全橋電路。設(shè)計(jì)的重點(diǎn)在于運(yùn)用MATLAB中的SIMULINK建立電路模型，對(duì)電路進(jìn)行仿真，并對(duì)仿
2、真結(jié)果進(jìn)行分析，得出系統(tǒng)參數(shù)對(duì)輸出的影響規(guī)律。關(guān)鍵字：雙極性PWM控制逆變電路SIMULINK仿真29目錄一、主電路工作原理··························································31.1PWM控制技術(shù)及SPWM波的生成···········································31.1.1PWM控制的基本原理······················································31.1.2
3、SPWM法的基本原理···················································41.1.3規(guī)則采樣法·························································41.2單極性和雙極性PWM控制逆變電路分析·····································51.2.1單極性PWM控制方式·················································61.2.2
4、雙極性PWM控制方式·················································6二、MATLAB仿真及結(jié)論分析····················································72.1建立仿真模型···························································72.1.1雙極性SPWM控制信號(hào)的仿真模型······································72.
5、1.2雙極性模式PWM逆變電路仿真模型·····································102.2雙極性模式PWM逆變電路仿真結(jié)果及分析···································13三、PSIM仿真及結(jié)論分析······················································203.1建立仿真模型···························································203.2
6、29仿真結(jié)果及分析·························································21四、總結(jié)與體會(huì)·······························································26五、參考文獻(xiàn)·································································27一、主電路工作原理1.1PWM控制技術(shù)及SPWM波的生成1.1.1PWM控制的基本原理PWM
7、（PulseWidthModulation）控制就是對(duì)脈沖的寬度進(jìn)行調(diào)制的技術(shù)。即通過(guò)對(duì)一系列脈沖的寬度進(jìn)行調(diào)制，來(lái)等效地獲得所需要的波形。PWM控制技術(shù)在逆變電路中的應(yīng)用最為廣泛，對(duì)逆變電路的影響也最為深刻，PWM控制技術(shù)在逆變電路中的應(yīng)用也最具代表性。29面積等效原理是PWM控制技術(shù)的重要理論基礎(chǔ)，即在采樣控制中，沖量相等而形狀不同的窄脈沖加在具有慣性的同一環(huán)節(jié)上時(shí)，其效果基本相同。其中，沖量指的是窄脈沖的面積；效果基本相同是指環(huán)節(jié)的輸出響應(yīng)波形基本相同。如圖1.1.1(1)所示，三個(gè)窄脈沖形狀不同，但是它們
8、的面積都等于1，當(dāng)它們分別加在如圖1.1.1(2)(a)所示的R-L電路上時(shí)，并設(shè)其電流i(t)為電路的輸出，則其輸出響應(yīng)波形基本相同且如圖1.1.1(2)（b）所示。（a）(b)(c)(d)圖1.1.1（1）沖量相等、形狀不同的窄脈沖（a）(b)圖1.1.1（2）形狀不同而沖量相同的各種窄脈沖及響應(yīng)波形1.1.2SPWM法的基本原理脈沖幅值相等而脈沖寬度按正弦規(guī)律變化而
