A Selective Power Droop Control for Hybrid Interlinking Converter in AC/LVDC Microgrid

In this project, a selective power droop control for a Hybrid Interlinking Converter (HIC) in connecting AC grid with Low Voltage DC (LVDC) grid is proposed. The direct connection to the LVDC means relatively lower converter capacity, lower switching loss, higher efficiency, and lower cost in HIC. However, the small capacity converter and large capacitive coupling impedance of HIC can lead to a relatively lower reactive power compensation range. 

Therefore, the practical over-capacity situation may be more likely to occur in HIC, which deteriorates the system performance. To address this issue, the unique P-δ and Q-P-V droops are proposed for HIC with automatic selective factors adjustment control. With the proposed control method, the HIC can effectively regulate active/reactive powers and improve power quality. The effectiveness of the proposed system is verified by simulation in MATLAB/SIMULINK.

Keywords: Low Voltage DC (LVDC), Hybrid Interlinking Converter (HIC), P-δ and Q-P-V droops.