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A Droop Control with Deadbeat Current Strategy to Improve Response Characteristic for Three Phase Parallel AC-DC Converter in DC Microgrid

This paper presents a droop control with a deadbeat current strategy which overcomes the drawbacks of existing PI(Proportional-Integral) controller for three phase AC-DC converter in parallel. In case of existing the droop with PI current controller, it has sensitivity to PI controller gains as well as a high overshoot is occurred by the PI controller. However, the proposed control method shows a rapid response characteristic by minimizing the overshoot with the deadbeat current strategy. In other words, the fast dynamic response can be achieved. In this paper, input side of three phase AC-DC converter in parallel has only inductor filter to apply for deadbeat current control of the proposed method. The validity of the proposed control system is verified by simulation.