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电网技术  2009 

用于级联型多电平变换器的新型脉宽调制方法

, PP. 55-59

Keywords: 级联型多电平变换器,梯形波,基波幅值,谐波,脉宽调制(PWM)

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Abstract:

提出一种用于级联型多电平变换器的新型脉宽调制(pulsewidthmodulation,PWM)方法,即将单个三角载波信号与多个梯形波调制信号进行规则对称采样。推导了梯形波边坡角与输出基波幅值和谐波含量的关系。与其他常用的PWM方法相比,该方法调制下的输出基波幅值更高,在选取适当的边坡角后,输出波形的谐波特性非常好。以5电平和13电平级联型多电平变换器为控制对象,对所提出的PWM方法进行了仿真验证,证明其在输出电压幅值和谐波特性方面具有优良的性能。

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