Design and implementation of a 5 kW 1φ bi-directional inverter with wide inductance variation

This paper presents design and implementation of a 5 kW 1 φ bi-directional inverter with wide inductance variation. The bi-directional inverter can fulfill grid connection and power factor correction, in which inductor current can vary from 0 to 32A in one line cycle. This will result in wide inductance variation, around 7 times for an inductor constructed with an MPP core, and thus high current ripple and high current fluctuation. In this paper, we take into account this variation while designing controller and selecting key components to ensure inverter normal operation. Additionally, to adopt a cost effective microcontroller for the inverter, the sensitivities of the control to various parameters are investigated and presented in the paper. Experimental results measured from a 5 kW 1 φ prototype have verified the feasibility of the designed inverter.