一种带多个补偿绕组的大容量有源电力滤波器

Active Power Filter with Large Capacity and Multiple Secondary Compensation Windings

为解决有源滤波器的大容量问题 ,提出一种串联变压器二次侧采用多个补偿绕组的结构。它检测一次侧基波电流并用逆变器产生多个基波补偿电流注入二次侧的多绕组中。二次侧的基波磁势与一次侧完全平衡时 ,一次侧就对基波呈现近似零阻抗而对谐波呈现高阻抗。二次侧绕组参数和逆变器参数的微小差异对整个控制系统基本无影响。

In order to design a series filter with large capacity, a novel transformer structure with multiple compensation windings is proposed. The fundamental component of the primary windings is detected and tracked so as to produce multiple compensation currents, which are injected to the multiple secondary windings. When the multiple injected fundamental current and the fundamental current component of the primary windings satisfy the fundamental magnetic flux compensation condition, the series transformer can really present very low impedance to fundamental and naturally magnetizing impedance to harmonics. The influence of the inconsistent mutual impedance and the inverter parameters is analyzed. The simulation of transformer with four compensation windings shows the validity of the novel structure.