Medium-Frequency Oscillation in Voltage-Controlled Full-Bridge Inverter with a Nonlinear Inductor

An inverter, whose inductor current is periodic, the key equipment for photovoltaic power generation, fuel cell etc. A nonlinear inductor, inductance will be changed by its current, can used to improve grid quality of although making mathematical model inverter system more complex. In this paper, voltage-controlled full-bridge with a investigated and established. The influence parameters on dynamical behaviors analyzed using harmonic balance method Floquet theory. Consequently, mechanism occurrence medium-frequency oscillation revealed. hardware circuit designed some experimental results are presented confirmation. research show that Hopf bifurcation frequency between line switching frequency.