Low frequency ripple current compensation with DC active filter for the single-phase aeronautic static inverter

The second order harmonic current drawn by the main part of single-phase aeronautic static inverter which is a typical load in the aircraft power system deteriorates the power quality of aeronautic high voltage power system. In this paper, the low frequency harmonic propagation which is hard to be filtered by the passive components is studied. In order to maintain a good power quality, a DC active power filter (DC-APF) is proposed to be installed in parallel with the aeronautic static inverter, producing the low-frequency current for the load. A novel DC-APF based on the “dual switch” topology is proposed in this paper. This novel configuration is suitable for the aircraft power system with the requirement of high reliability for its inherent “no shoot-through” behavior, optimization of the devices and good comprehensive performance. Control strategy of this con-figuration and discussion about the modeling analysis are given as well. Experimental results are shown to verify the good harmonic compensation characteristic.