新型混合型滤波器设计

根据目前常见的几种混和有源滤波器,提出1种注入式混和有源滤波器,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。阐述混和有源滤波器和注入式有源滤波器的工作原理,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和抑制它与系统阻抗可能发生的谐振。理论分析和实验结果表明,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的优点,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,通过样机实验验证结论正确性。

A New Design of 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 proposed 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.