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电网技术  2013 

PWM变流器分段平均模型中的纹波估计方法

, PP. 2143-2150

Keywords: PWM变流器,平均模型,电磁暂态,纹波估计

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Abstract:

在电力系统稳定性分析和控制策略研究中,PWM变流器的平均模型被广泛采用。然而,仅考虑状态变量的平均分量而忽略其纹波,可能导致系统暂态仿真及分析结果的不正确。为此,提出了PWM变流器状态变量纹波估计的一般方法,并得到了纹波的近似表达式。三相PWMAC-DC变流器和升压斩波器的仿真结果表明,所提出的纹波估计方法能够给出实际纹波的精确近似表达式,从而显著提高PWM变流器平均模型的准确性。

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