Hi Aravind,
As per my understanding, you wish to know the reason for the high starting current spike observed in the designed circuit.
After reviewing the Simulink model provided, the high starting current observed is due to Inrush current. The inrush current spike is observed in circuit because the input battery is directly connected to uncharged capacitor at the starting, causing a spike in current. Hence, the current spike at the starting is expected behaviour in the designed circuit.
Please refer to below MathWorks documentation which provides an example implementation for Bidirectional DC-DC Converter Current Control:
I hope this helps!
