دانلود رایگان مقاله انگلیسی مبدل dc-dc تک سوئیچ با قابلیت افزایش ولتاژ برای سیستم تولید انرژی مبتنی بر PV خورشیدی - الزویر 2018

ABSTRACT

This paper presents a single switch non-isolated DC-DC converter with high voltage gain capability for solar photovoltaic (PV) applications. The proposed converter is synthesized from passive switched inductor (SI) and switched capacitor (SC) topologies and integrated with an additional voltage boost capacitor to enhance the voltage gain. Due to the converter structure and adopted gain extension technique, the voltage stress on the switch and three diodes is 50% of the output voltage, while the remaining diodes experience a voltage stress of only 25% of the output voltage. Experimental results obtained from a 34 V/380 V, 200 W prototype converter validate the proposed concept, adopted design procedure and illustrates the fact that the proposed converter operates at a full load efficiency of 93%. Further, the proposed converter provides better component utilization compared to some existing converters.

7. Conclusion

A non-isolated high step-up switched inductor-switched capacitor based DC-DC converter is presented in this paper. The structure of the proposed converter is obtained by judiciously modifying basic SI-SC converter. The modifications are (i) introduction of boost capacitor in passive switched inductor cell and (ii) combination of this arrangement with basic SC cell. The novel voltage gain technique adopted in the proposed converter yields a voltage gain of 11.29. Since SI and SC were used along with a boost capacitor, the voltage stress experienced by the switch is reduced to 50% which is only a fraction of the output voltage. Experimental results obtained from a prototype converter prove that the converter handles 200 W power at 93% efficiency and provides a voltage gain of 11.29. As only single active switch is used, the proposed converter offers better component utilization besides being amenable for implementing control algorithms easily. The salient features of the proposed converter make it a promising candidate for interfacing the input PV source with a 380 V DC bus or a DC micro grid.