Abstract
This paper proposes a family of high-voltage-gain step-up dc-dc converters for photovoltaic integration application. The proposed converters are capable of converting the low voltage from input sources to a dc bus. The proposed family is constructed of interleaved single-switch multistage boost converters and voltage multiplier cells (VMC). The proposed converters feature low voltage stress across the components, equal current sharing among all phases, and a smooth input current. Moreover, the proposed family of converters has a modular structure in both the VMC and the boost stage. That is, the VMC can have N number of cells, and the boost stage can have k number of stages. The k can be different in each phase, allowing the designers to integrate two independent renewable energy sources with different output voltages. An example converter was explained, analyzed, and simulated. An 80 W hardware prototype was implemented to confirm the converter’s operation and validate the analysis.
Highlights
The high-voltage-gain dc-dc step-up converters have become more prevalent in recent years due to the progress in power and energy fields and the development of technologies, such as smart grids, dc microgrids, and dc distribution systems [1,2,3,4,5]
The dc distribution system was found to be an upgrade alternative to the ac distribution system because of the reduced number of conversion units, the capability to protect against grounding faults, superior power quality, and cost-effectiveness
The dc distribution is desirable for renewable energy sources and battery incorporation to the grid [6,7,8,9,10,11,12]
Summary
The high-voltage-gain dc-dc step-up converters have become more prevalent in recent years due to the progress in power and energy fields and the development of technologies, such as smart grids, dc microgrids, and dc distribution systems [1,2,3,4,5]. Similar to using a transformer, using an integrated coupled inductor improves the voltage gain without providing isolation, such as a hybrid flyback-boost, interleaved with coupled inductors, or quadratic boost converter with coupled inductors Such topologies suffer from leakage inductance and require extra circuits for circulating the energy and reducing the voltage stress across the switches [30,31,32,33]. The converter features low voltage stress on components and high voltage gain, allows the user to get the most ripple cancellation that interleaving offers, has the capability to integrate different voltage sources, and can match a wide range of loads. Each phase of the interleaved multistage can have either the same or a different number of boost stages than the other phases This can be very useful for integrating sources with a significant difference in their output voltage.
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