Predictive digital controlled three phase bi-directional inverter with wide inductance variation

This paper presents predictive digital controlled three phase bi-directional inverter with wide inductance variation. The bi-directional inverter can fulfill both grid connection and power factor correction. With a predictive digital control, the inverter is allowed to have a wide inductance variation, reducing core loss and size significantly. The proposed predictive digital control laws can be derived with either an accurate approach or an approximated one. In the design and implementation, the inductances corresponding to various currents are measured, and tabulated into a single-chip controller for tuning loop gain cycle by cycle, ensuring system stability. Measured results from a 10 kW 3φ bi-directional inverter have been presented to confirm the feasibility of the discussed inverter.