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CN105720580A 一种逆变器LCL滤波器的谐波影响抑制方法及装置 无效 - 驳回

一种逆变器LCL滤波器的谐波影响抑制方法及装置
摘要：
本发明提供一种逆变器LCL滤波器的谐波影响抑制方法及装置，该方法包括：建立非特征次谐波复数滤波器模型；将电网电压Uabc输入非特征次谐波复数滤波器模型，生成电网电压Uabc在αβ坐标下的非特征次谐波电压将电网电流Iabc输入非特征次谐波复数滤波器模型，生成电网电流Iabc在αβ坐标下的非特征次谐波电流根据非特征次谐波电压及非特征次谐波电流计算电网线路的电阻分量Rg(hx)及电抗分量Lg(hx)；根据电抗分量Lg(hx)计算逆变器LCL滤波器的谐振频率fr；根据谐振频率fr计算逆变器LCL滤波器的谐振角频率ωr；根据谐振角频率ωr建立电流带通滤波器模型，通过电流带通滤波器模型对谐振频率fr增加阻尼作用，抑制谐振峰。
摘要（英）：

The invention provides a method and a device for suppressing the harmonic effect of an inverter LCL filter. The method comprises the following steps: establishing a non-characteristic harmonic complex filter model; inputting a grid voltage Uabc into the non-characteristic harmonic complex filter model to generate a non-characteristic harmonic voltage U of the grid voltage Uabc under an alpha-beta coordinate system; inputting a grid current Iabc into the non-characteristic harmonic complex filter model to generate a non-characteristic harmonic current I of the grid current Iabc under the alpha-beta coordinate system; calculating the resistive component Rg(hx) and reactive component Lg(hx) of a grid line according to the non-characteristic harmonic voltage U and the non-characteristic harmonic current I; calculating the resonance frequency fr of an inverter LCL filter according to the reactive component Lg(hx); calculating the resonance angular frequency omega(r) of the inverter LCL filter according to the resonance frequency fr; and establishing a current band-pass filter model according to the resonance angular frequency omega(r), and adding a damping effect on the resonance frequency fr through the current band-pass filter model to suppress harmonic peaks.

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