A transformerless multiple-port DC-DC converter for energy harvesting and dispatching

Multiple-port converters (MPCs) have been identified as a cost-effective approach for energy harvesting and dispatching in hybrid power systems. Compared with relatively complex set-up of single-input single-output converters linked at a common dc bus to exchange power, the MPCs possess promising features of fewer components, higher power density and centralized control. This paper proposes a transformerless MPC that transfers power between different sources and loads with a minimal number of conversion steps. The steady-state analysis and dynamic modeling of the proposed MPC are introduced in detail. The output voltage regulation and power flow control can be achieved simultaneously by a multivariable control. Detailed switch simulation and average model are presented to verify the effectiveness of the proposed MPC.