High-gain dc–dc converters are used for a number of applications including the power processing of several low-voltage renewable energy sources (solar photovoltaic and fuel cells) while they are integrated into a microgrid. This article introduces two novel designs of high power density nonisolated quadratic boost converters, which neither uphold the cascaded architecture nor involve coupled inductors in them. The proposed converters utilize the switched-inductors and switched-capacitor-based modules for voltage boosting. Despite having a higher output voltage, the proposed topology in its extended mode offloads the issue of high voltage stress at the devices. The output voltage can be extended to further higher levels without requiring additional circuits for peak inverse voltage (PIV) suppression at the output diode. The current at the input and output terminals are continuous, which facilitates the converter for various applications such as distributed generation (DG)s integration to microgrid and uninterruptible power supplies for integrated battery storage systems. The switched-inductor-switched-capacitor quadratic converter and its extended topology, extended switched-inductor-switched-capacitor quadratic converter, are analyzed thoroughly in different modes of conduction and the performance is justified by developing a hardware prototype ranging for a maximum power of 400 W. The switching frequency is maintained at 50 kHz.

DC-DC converters hold immense importance due to their diverse applications, making it critical to design them in accordance with the demanding operational requirements. Conventional boost converters face significant challenges at high voltage levels, requiring excessively high duty cycles that lead to increased component stress, switching transients and losses, electromagnetic interference (EMI), and diode reverse recovery issues. This paper presents the design of a new voltage scaling converter with applications in high-voltage scenarios, such as the integration of solar photovoltaic (PV) systems into a high-voltage DC bus within a microgrid. The proposed converter features an extendable design and flexible control, enabled by the incorporation of dual duty cycles, allowing for a broader range of operational flexibility. The converter simultaneously achieves high voltage gain, reduced component stress, continuous input current, high power density and a wide range of feasible duty ratios. The utilization of multiple passive elements is analytically verified by studying variations in parameters, such as the presence of inductors with different values. Finally, the converter's performance is validated through experiments conducted on a 600W prototype operating at a frequency of 50 kHz. Additionally, the closed-loop operation of the converter is validated by its ability to maintain a regulated 400V DC bus voltage, despite variations in the input voltage.

Microgrids rely heavily on stand-alone renewable sources like PV (Photovoltaic) and FC (Fuel cells) to power high voltage DC buses. When a conventional DC-DC converter is deployed as an interfacing device, it must work at a high duty ratio to provide the required bus voltage. This may have serious ramifications for the reliability and longevity of the device. The diode reverse recovery issues, undesirable transient response, losses, and reduced efficiency are just a few examples. High gain converters are typically recommended to deal with such unfavorable circumstances. This article aggregates and analyses several switched inductor (SL) and capacitor (SLC) based dc-dc converters, followed by a proposed expanded novel topology with superior characteristics over existing ones. This novel converter not only enhances gain but also has the lowest voltage stress across the switches, as well as minimal voltage ripples and continuous current on the input side, making it appropriate for renewable-based systems. Moreover, its architecture is free from any complex network such as coupled inductor, transformers or cascaded designs. The analysis of the converter has been carried out in different modes of operation followed by its validation through simulation and experimental results.