Stabilization Method for DC-bus Oscillation in Dynamic Wireless Power Transfer Systems

Dynamic wireless power transfer systems will have a DC bus, which supplies power to inverters with transmission coils intermittently placed over long distances on the road surface. As the length of the DC bus increases, the wiring inductance also increases. This effect affects inverters that are located far from the power source of the DC bus, requiring them to connect through this increased wiring inductance. When the inverter performs current control on the output side, it may cause negative impedance, resulting in the DC-bus voltage oscillation. This paper proposes a control method to prevent instability of the DC bus voltage by utilizing positive feed-forward (PFF) control. The experimental results with the small-scale prototype show that the proposed control effectively prevents instability.