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有限阻抗型混合有源电力滤波器中应用电压谐波前馈控制 ,能加强对网侧电压的谐波抑制。然而 ,当电压与电流信号共用一个 d— q滤波器时 ,较高幅度的电压信号会降低电流通道的谐波提取质量。文中采用 LC滤波器在 d—q滤波器前对电压信号进行预处理 ,能够有效衰减其基波成分 ,而对谐波则没有明显改变。分析与实验结果表明 ,该方法能在保证电流谐波提取质量和基本不增加控制系统复杂性的条件下 ,满足网侧电压谐波的提取要求。
The application of voltage harmonic feed-forward control in the finite impedance hybrid active power filter can enhance the harmonic suppression on the grid-side voltage. However, when a voltage-current signal shares a d-q filter, higher-amplitude voltage signals reduce the harmonic extraction of the current path. In this paper, the LC filter is used to pre-process the voltage signal before the d-q filter, which can effectively attenuate the fundamental components of the d-q filter without significant changes to the harmonics. The analysis and experimental results show that this method can meet the requirement of voltage harmonics extraction on the condition of ensuring the quality of current harmonic extraction and not increasing the complexity of control system.