有限阻抗型混合有源电力滤波器的新检测方案

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，能加强对电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。

A NEW HARMONICS DETECTION DESIGNING FOR HYBRID ACTIVE POWER FILTER OF FINITE HARMONIC IMPEDANCE

Applying feedforward control of harmonic voltage to hybrid active power filter of finite harmonic im pedance can restrain line harmonic voltage.It is found that the higher voltage signal will reduce the extraction quality of harmonic current if current and voltage signals use the sam e d- q filter. In this paper,a L C filter inserted before d- q filter for voltage signal pre- process can attenuate the fundam ental com ponent of voltage signal effectively and change the harmonics slightly only. Analytic and experimental results show that the m ethod can keep the extraction quality of harm onic current and meet the requirem ent of harmonics extraction of line voltage without increasing the system com plexity. This project is supported by DEL TA Science,Technology and Education Development Foundation for Power Electronics of China.