Abstract
Due to concerns, such as global warming and depletion of fossil fuels, countries are forced to integrate energy storage devices (ESSs) and renewable energy sources (RESs), such as photovoltaic (PV) systems, wind turbines and fuel cells, into their power networks. Here, a new high gain DC–DC converter with step-up/down ability is proposed for modern applications. Since this converter provides high variable voltage gain, it can be employed for output voltage regulation purposes in RESs such as solar panels. Additionally, this converter provides a remarkable reduction in voltage stress on the switched capacitors and power switches. Due to its modular structure obtained by employing switched-capacitors (SCs), it is possible for this topology to gain a very high voltage conversion ratio using low duty-cycles produced by a simple and straightforward control system. To be specific, the more the number of SC cells increase, the more the output voltage increases. The proposed converter has a continuous input current allowing to extract the maximum power from RESs like PV panels. It should be noted that the application of this converter is not limited to the aforementioned ones since it can be used in various applications needing high voltage gains such as generating the desired voltage level in high voltage direct current (HVDC) systems especially their transmission lines. For validating the performance of the proposed structure, comprehensive comparisons and experimental results are presented.
Highlights
These days, numerous DC–DC power electronics-based converters are widely used in various modern and conventional applications [1,2]
Isolated converters are connected to the system or load through a transformer that can be used for either voltage regulation or isolation purposes
Due to the drawbacks imposed by the transformer on the system, such as increased cost, weight, and power losses, both academic and industrial efforts have been focused on non-isolated DC–DC topologies, called transformer-less converters
Summary
These days, numerous DC–DC power electronics-based converters are widely used in various modern and conventional applications [1,2]. In [30], Vosoughi et al presented a DC–DC SC converter capable of regulating the output voltage and providing high voltage gain and continuous input current for RES applications especially PV systems. DC converter is presented, which, in contrast to other converters, such as Zeta, buck-boost, and the Zeta-based converters of [25,26,27,31], has continuous input current This converter is suitable for RES applications and can provide higher voltage gains compared to other structures at the same class. Mostly in DC microgrids, AC RESs, such as wind turbines, are used in which the voltage can be regulated by the proposed converter after changing its nature to DC voltage using a simple circuit [4,6] This converter can be used to provide the desired voltage level in high-voltage direct current (HVDC) systems, especially in their transmission lines. To prove the analysis and claims, thorough comparisons, simulations, and experiments are performed and presented
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