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电网技术  2010 

电力逆变器调制理论的扩展研究

, PP. 63-67

Keywords: 电力电子,电力变流器,调制理论,开关函数,相控,脉宽调制控制

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Abstract:

调制理论是电力变流器分析的有效工具,但是目前调制理论提供的公式在数量和灵活性上具有局限性,难以适应工作在不同控制方式下的逆变器分析。对电力变流器调制理论进行扩展研究,推导出调制理论的扩展公式,并以三相六脉动逆变器为例,详细分析逆变器在相控和脉宽调制(pulsewidthmodulation,PWM)控制方式下的所有工作状态,同时推导出其完整的调制公式,并通过物理实验和软件仿真进行验证。推导出的扩展调制公式适用于采用不同控制方式的逆变器,可以从逆变器任意一侧的电压(或电流)直接推导出另一侧的电压(或电流),从而为电力逆变器的建模和分析提供极大灵活性。

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