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This paper suggests a nonisolated noncoupled inductor-based topology for direct current (DC)-DC converters for DC microgrids. The proposed configuration profits from advantages like high step-up capability, continuous input

This study proposes a modular high voltage gain structure for non-isolated non-coupled inductor based multi-input (NINCIBMI) dc-dc converters. Proposed topology can produce higher voltage gains per number of components (switch, diode, capacitor and inductor) than other NINCIBMI topologies. In other words, the proposed topology uses less number of components for achieving the same voltage gain. This property can lead to reduced cost, size, weight and complexity of topology. Also, proposed topology benefits from continuous input current. Despite the high voltage gain of proposed topology, it has considerably low normalised voltage stress (NVS) on its switches/diodes. Another important advantage of proposed topology is that, as the number of input units increase, the voltage gain increases too, but the NVS on switches/diodes decreases. The proposed topology is suggested for low and medium power applications. The 2-input version of proposed topology has been studied in detail and different operational modes and steady-state analyses have been presented. For a better evaluation, proposed topology has been compared with recently presented novel multi-input high step-up structures. The 2-input version has also been experimentally implemented. Obtained results confirm appropriate performance of proposed topology. 2 Proposed topology Proposed topology is composed of (n) input units (Fig. 1). The basic input unit (presented in [14]) is comprised of two inductors (L ia , L ib), a capacitor (C i) and three switches (T i,1 , T i,2 , T i,3). In BPF operation, the switches are realised by a metal-oxidesemiconductor field-effect transistor (MOSFET) with an antiparallel diode. However in unidirectional applications, T i,3 can be replaced by a diode (D′ i). All the input units (except the last one)

Summary This paper proposes a modular nonisolated noncoupled inductor‐based high‐voltage gain multi‐input DC‐DC converter. Despite the high‐voltage gain of the proposed topology, the average of normalized voltage stress (NVS) on its switches/diodes is low. This property leads to less loss and cost of switches/diodes. Using the same number of components, the proposed topology produces higher voltage gains, in comparison with recently presented high step‐up topologies. Also, the proposed topology utilizes less number of components (capacitors, inductors, diodes, and switches) for producing a desired voltage gain, which can reduce the size, mass, cost, complexity, and losses and improve the efficiency of converter. Continuous current of input sources is another main advantage of the proposed topology. All the abovementioned characteristics have made the proposed topology very suitable for renewable energy systems (or even hybrid/electric vehicles). Design considerations of the proposed topology have also been presented. For better evaluation, the proposed topology has been compared with some of recently presented high step‐up structures, from viewpoints of producible voltage gain, number of components, and normalized voltage stress (NVS) on switches/diodes. Finally, the prototype of 2‐input version has been experimentally implemented. Obtained experimental results confirm appropriate performance of the proposed topology.