Analysis of start-up inrush current and its mitigation control strategy for grid connected voltage source inverter

Grid connected voltage source inverters are increasingly used in the fields of power exchange with grid, but not enough attention was paid to its start-up inrush current. In this paper, the hazard of the start-up inrush current of voltage source inverter in high power usage was explained and its production mechanism was analyzed. The paper also presented a control strategy of the converter to mitigate the inrush current based on injecting a reverse DC component current to the main circuit. Simulation are provided to verify the feasibility of the method and the results show a good performance in reducing the inrush current in start up and also the DC offset in stable state.