研究目的
Investigating the design of a bipolar interface converter for purely DC microgrids with minimally processed maximum power point operation of photovoltaics.
研究成果
The work proposes a purely DC power based design for bipolar microgrid where photovoltaics are operated at their maximum power point by their respective differential power processing flyback converters. The low voltage DC bus is interfaced to the loads through dual-winding dual active bridge converter (DW-DAB) that provides galvanic isolation, voltage transformation as well controlled bipolar voltage bus (±190V). This eliminates the need for dedicated 'voltage balancers' as the DAB can control the voltages while adjusting power flows.
研究不足
The study does not consider the case where more power is being produced than load power, necessitating the energy harvesting system to work in off-MPP mode. Additionally, the interaction of the differential power MIC with MW-DAB under all possible conditions is not fully explored.
1：Experimental Design and Method Selection:
The study proposes an interface converter that works as the primary power flow path while controlling the bipolar bus voltage at ±190V even under unbalanced load connection. The converter is designed with an output series connected multi-winding dual-active bridge converter (MW-DAB).
2：Sample Selection and Data Sources:
The DC microgrid system consists of PV as energy sources, controlled at their optimal power point by differential power processing module-integrated converters (DPP-MIC) which produce a unipolar DC bus of a lower voltage (< 150V).
3：List of Experimental Equipment and Materials:
The transformer design was created with leakage inductance of the primary side designed to be 10μH while the two secondary side inductances are 5μH each. Ferrite cores were considered for the design with EE65/32/27 chosen for the design.
4：Experimental Procedures and Operational Workflow:
The primary side of the converter is connected to power source, while the two secondary sides are connected in series with the mid-point acting as the current return path.
5：Data Analysis Methods:
The study includes simulation results to assist in understanding the operation under steady state and transient conditions.
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