一种高压大容量有源电力滤波器研究

提出一种新型的基于变压器谐波电流补偿的高压大容量有源电力滤波器。变压器采用副方多补偿绕组结构,原方绕组与谐波负载相并联,副方补偿绕组分别与逆变器相联。实时检测变压器原方绕组的谐波电流,通过逆变器产生与原方绕组谐波电流成比例的谐波补偿电流注入变压器副方多补偿绕组中。当原、副方绕组的谐波电流满足谐波电流补偿条件时,变压器原方绕组对谐波电流呈现近似为零的低阻抗,而对基波电流呈现很大的励磁阻抗,从而输导高压电力系统中的谐波电流流入变压器支路。仿真结果证明了这种滤波新原理的正确性。

Research on high voltage large capacity active power filter

An active power filter based on harmonic current compensation of the transformer is proposed for high voltage large capacity application.The transformer adopts multiple secondary compensation winding structure.The primary winding is in parallel with the harmonic load and the secondary compensation windings are connected with PWM inverters.The harmonic compensation currents proportional to the harmonic current in the primary winding,which is detected real-timely,are injected to the multiple secondary winding of the transformer.When the harmonic current compensation condition is satisfied,the primary winding of the transformer can really exhibit nearly zero impedance to harmonic current and great excitation impedance to fundamental current,leading the harmonic current of system into transformer circuit.The simulated results verify the validity of this principle.