一种混合型有源电力滤波器的研究

提出了一种混合型有源电力滤波器电路结构。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。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,因此最大限度地减少了有源滤波器的容量,使有源电力滤波器能够应用于大功率场合。

Study on Hybrid Active Power Filter

In order to restraint the harmonic current caused by nonlinear rectified load to flow into power supply,a novel 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 compensation and it is used to improve the filtering effect of passive filter.The test results 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 can be reduced the furthest,therefore the APF can be used in high power.