双极性模式PWM逆变电路

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1、电力电子系统计算机仿真题目：双极性模式PWM逆变电路班级：姓名：学号：指导老师：日期：29摘要PWM控制就是对脉冲的宽度进行调制的技术。即通过对一系列脉冲的宽度进行调制，来等效地获得所需要的波形。PWM控制技术在逆变电路中的应用最为广泛，现在大量应用的逆变电路中绝大部分都是PWM型逆变电路。本设计为双极性PWM方式下的单相全桥逆变电路，主要包括双极性SPWM控制信号的发生电路和带反并联二极管的IGBT作为开关器件的单相全桥电路。设计的重点在于运用MATLAB中的SIMULINK建立电路模型，对电路进行仿真，并对仿

2、真结果进行分析，得出系统参数对输出的影响规律。关键字：双极性PWM控制逆变电路SIMULINK仿真29目录一、主电路工作原理··························································31.1PWM控制技术及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规则采样法·························································41.2单极性和双极性PWM控制逆变电路分析·····································51.2.1单极性PWM控制方式·················································61.2.2

4、双极性PWM控制方式·················································6二、MATLAB仿真及结论分析····················································72.1建立仿真模型···························································72.1.1双极性SPWM控制信号的仿真模型······································72.

5、1.2双极性模式PWM逆变电路仿真模型·····································102.2双极性模式PWM逆变电路仿真结果及分析···································13三、PSIM仿真及结论分析······················································203.1建立仿真模型···························································203.2

6、29仿真结果及分析·························································21四、总结与体会·······························································26五、参考文献·································································27一、主电路工作原理1.1PWM控制技术及SPWM波的生成1.1.1PWM控制的基本原理PWM

7、（PulseWidthModulation）控制就是对脉冲的宽度进行调制的技术。即通过对一系列脉冲的宽度进行调制，来等效地获得所需要的波形。PWM控制技术在逆变电路中的应用最为广泛，对逆变电路的影响也最为深刻，PWM控制技术在逆变电路中的应用也最具代表性。29面积等效原理是PWM控制技术的重要理论基础，即在采样控制中，冲量相等而形状不同的窄脉冲加在具有惯性的同一环节上时，其效果基本相同。其中，冲量指的是窄脉冲的面积；效果基本相同是指环节的输出响应波形基本相同。如图1.1.1(1)所示，三个窄脉冲形状不同，但是它们

8、的面积都等于1，当它们分别加在如图1.1.1(2)(a)所示的R-L电路上时，并设其电流i(t)为电路的输出，则其输出响应波形基本相同且如图1.1.1(2)（b）所示。（a）(b)(c)(d)图1.1.1（1）冲量相等、形状不同的窄脉冲（a）(b)图1.1.1（2）形状不同而冲量相同的各种窄脉冲及响应波形1.1.2SPWM法的基本原理脉冲幅值相等而脉冲宽度按正弦规律变化而