Design of dual input multi output boost converter for grid connected micro inverter applications

Abstract

Multi-Input and Multi-Output (MIMO) boost converters are employed to meet unique system requirements for high-power applications having centralized control and a high level of reliability. Paralleling power converters with interleaving technique results in harmonic cancellation, improved thermal performance, improved efficiency, and a high-power density. A novel Dual Input Multiple Output(DIMO) DC-DC boost converter derived from a conventional Single Input Multiple Output (SIMO) boost converter that leads to the possibility to interconnect multiple renewable energy sources has been proposed. To obtain the necessary output voltages, this converter employs switched-capacitor and coupled inductor. The voltage stress on switches are reduced in this proposed topology by splitting the input sources into two. The output voltage levels and the input dc voltage sources are independent of the suggested structure for the multi-input multi-output boost DC-DC converter. The single-stage MIMO DC-DC converter employs a large number of switches, with (n + m) switches required for an n-input, m-output converter, making the structure rather complicated. newlineA multi-input single-output DC-DC converter based on buck-boost DC-DC converters developed in the conventional methods to integrate the multiple energy sources into the grid. This structure with the positive polarity of the output voltage is capable of operating in the buck, boost, and buck-boost modes. However, the large number of components results in substantial switching losses and additional expenditures. A high step-up low duty cycle multi-port DC DC converter for grid-tied PV systems was proposed. Low voltage stresses on switches are another feature of this structure. newline