一种新型混合型有源电力滤波器的研究

提出了一种单相并联混合型有源电力滤波器的电路结构.该电路由有源滤波器与基波串联谐振支路并联再与无源滤波电路串联构成,用于抑制非线性整流负载产生的谐波电流流入电源侧.在该电路中,无源滤波器分担大部分抑制谐波和无功补偿的任务,减少了有源滤波器的容量;有源电力滤波器用于改善无源滤波器的滤波效果,抑制它与系统阻抗可能发生的谐振.实验结果表明,该混合型有源滤波器充分发挥了无源滤波器和有源滤波器各自优点,改善了无源滤波器的滤波性能,同时使有源滤波器不再承受基波电压,最大限度地减少了有源滤波器的容量,从而使有源电力滤波器可应用于大功率场合.

Study on a new hybrid active power filter

In order to restraint the harmonic current caused by nonlinear rectified load to flow into power supply,a novel single-phase shunt hybrid active power filter(APF),in which an APF is connected in parallel with a fundamental harmonic series resonance branch then connected in series with a passive filter,is proposed.In the hybrid APF,the passive filter shares the main portion of harmonic restraint and reactive power compensation.The APF is used to improve the filtering effect of passive filter and to restraint the probable resonance between passive filter and system impedance.The results from tests and theoretical analysis show that the proposed hybrid APF can make full use of the merits of APF and passive filter respectively and improve the filtering performance of passive filter,at the same time the APF does not bear the fundamental harmonic voltage,thus the capacity of APF can be utter-mostly reduced,therefore the APF can be used in the circumstance of high power.