A modified Z‐source switched‐capacitor based non‐isolated high gain DC‐DC converter for photovoltaic applications

Abstract

This work proposes a modified high gain DC‐DC converter integrated with two boost converter stages, based on a boost cell and a Z‐source (ZS) cell with a switched capacitor (SC). The proposed converter architecture is simple, with a continuous input current and a wide range of input voltage fluctuation handling capabilities. It also provides a high voltage gain while minimizing voltage stress on semiconductor components. Because of the aforementioned characteristics, the proposed converter is suitable for combining with low‐voltage DC‐sources to high‐voltage DC bus in a variety of applications such as solar photovoltaic (SPV), fuel‐cell, and LED lighting. The operational principles, thermal modeling, steady‐state, and dynamic performance analysis are meticulously carried out on a 400 W laboratory prototype of the proposed converter. The converter's performance is carefully compared with similar existing topologies in terms of total device count and size, the voltage stress on power semiconductors, voltage gain, and peak efficiency. Furthermore, experimental findings show that a 12 V input is boosted to 98.8 V at a duty ratio of 0.3, demonstrating the efficacy of the proposed converter over a comparable structure.

An integrated coupled inductor–capacitor DC–DC high step‐up converter

“…One of the most utilization method of the solar energy is the photovoltaic (PV) power generation, which is extensively applicable across the world. [2][3][4][5][6] An inverter is vital to be used when the power grid is connected with the PV source because as compared to the line voltage of the grid, PV system's output voltage is low. One way to meet with the inverter's high voltage level of the input is to use PV series stacking modules.…”

“…Therefore, it is imperative to replace traditional energy sources with a clean renewable energy sources. One of the most utilization method of the solar energy is the photovoltaic (PV) power generation, which is extensively applicable across the world 2–6 . An inverter is vital to be used when the power grid is connected with the PV source because as compared to the line voltage of the grid, PV system's output voltage is low.…”

An elevated gain DC-DC converter with active switched inductor for PV application

“…A new configuration elevated gain DC-DC converter that improves the effectiveness of PV panels for powering water pumping structure is explained in [17]. A modified DC-DC converter that has a boost module and a Z-source module with a relatively high gain is proposed in [18]. Using four switches, a novel configuration of many input boost converters with fault tolerance is presented in [19].…”

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“…It is impossible to achieve high voltage gain while using a typical CUK converter. The main benefit of the suggested design is that the output voltage may be negatively increased by utilizing a mix of capacitors and diodes without affecting the main circuit [7]. The effectiveness of DC converters has been demonstrated as an option for battery charging applications.…”