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Abstract
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The increasing prevalence of grid-connected photovoltaic systems necessitates the development of inverters that are completely compliant with grid standards, safe, and highly efficient. Inverter structures with high voltage gain are necessary due to the fact that photovoltaic sources have a lower output voltage than the grid voltage level. Simultaneously, the elimination of transformers to increase power density and reduce costs has resulted in the widespread adoption of non-isolated inverter topologies. It is evident that these circumstances necessitate the construction of structures that are both highly reliable and capable of increasing voltage.
Non-isolated grid-connected inverters encounter significant safety concerns and leakage current. These issues have been effectively addressed by employing common-ground topologies between the DC and AC portions. Nevertheless, the simultaneous achievement of high voltage gain, common-ground operation, acceptable semiconductor stress levels, and high-quality grid-injected current necessitates meticulous analysis and precision inverter design. In numerous instances, the addition of voltage gain results in a more intricate circuit and increased losses. This presents a significant design challenge: the trade-off between efficacy and structural simplicity.
In these circumstances, the development of solutions that enhance efficiency, safety, and power quality is achieved by focusing on the study and application of high-gain, common-ground grid-tied inverters. This is essential for enhancing the efficacy of photovoltaic systems and simplifying their connection to power grids.
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