一种三相大容量有源电力滤波器的研究

为了提高串联型有源电力滤波器的容量,提出串联变压器的二次侧多补偿绕组结构。每个补偿绕组配置一个逆变器,通过逆变器向相应的补偿绕组注入基波电流,当变压器原副边基波电流满足基波电流补偿条件时,串联变压器的一次侧对基波电流呈现很低的阻抗,而对谐波电流呈现很高的阻抗,从而迫使谐波电流流入无源滤波电路。研制了一套100 kVA的样机,实验结果证明此滤波器具有很好的滤波特性。

Research on Three Phase Active Power Filter with Large Capacity

A novel three phase large capacity series hybrid active power filter(APF) is presented.To increase the capacity of the active power filter,multiple compensation winding structure is adopted in secondary of the series transformer.The PWM inverters that configure to each compensation winding are applied to produce fundamental currents,which are injected to the corresponding compensation windings.When the fundamental current compensation condition is satisfied,the series transformer can exhibit very low impedance to fundamental current and very high impedance to harmonic current,thus compel harmonic current to flow into passive filter circuit.A prototype with 100 kVA capacity is developed.Experimental results show the excellent filtering characteristic of the active power filter.