In this study, a multiple-input non-isolated DC/DC converter topology is presented. The proposed multiple-input DC/ DC converter is proficient for energy diversification from renewable and storage energy sources individually or simultaneously. It can be operated in buck, boost and buck-boost modes of operation with the capability of bidirectional power flow to achieve desired voltage level on either side. The development of small-signal modelling based on state-space averaging has been discussed. In addition, a power management control scheme for the proposed converter has also been presented. The proposed concept has been investigated through simulation using the MATLAB/Simulink environment and validated experimentally on a laboratory prototype using dSPACE 1103 real time digital controller.
The interest in development of newer topologies of multilevel inverter has been increasing rapidly in past few years. Recently introduced topologies achieve higher number of output voltage steps with reduced number of switches, DC voltage sources, voltage stress across switches and losses as compared with the conventional topologies. In this study, a new structure of symmetrical multilevel inverter is proposed. The proposed structure offers reduced number of controlled switches, power diodes and DC sources as compared with classical and recently proposed topologies in the literature. Reduction of switch count and DC voltage sources reduces the size, cost, complexity and enhances overall performance. Proposed topology is capable of producing 7, 9 and 11 levels of output voltage with seven switches only. Moreover, significant reduction in voltage stress across the switches can be achieved. A comparative analysis of proposed topology with the conventional topology and recently published topologies has been made in terms of controlled switches, power diodes, driver circuit requirement, DC voltage sources and blocking voltage. Multi-carrier pulse-width modulation strategy is adopted for generating the switching pulses. Simulation study of the proposed topology has been carried out using Matlab/Simulink and feasibility of topology has been validated experimentally.
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