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Transcript

Isolated High Step-Up DC-DC Converter Based on Quasi-Switched-Boost Network Abstract: In this paper, a new isolated high step-up DC-DC converter is proposed based on the quasi-switched-boost network. The proposed converter has the following features: 1) continuous input current; 2) reduced turn ratio of the isolated transformer; 3) increased reliability, as it can operate in either short-circuit mode or open-circuit mode without causing damage to the power converter; and 4) unchanged primary and secondary voltage waveforms of the transformer, although the shoot-through duty cycle is variable. Compared to the quasi-Z-source-based isolated DC-DC converter, the proposed converter uses fewer passive components. The operating principles, analysis, parameter design guideline, and comparison with the quasi-Z-source-based isolated DC-DC converter are presented. A 450 W prototype is built to test the proposed converter. The proposed converter is applicable for distributed power generation applications where a varying low dc input voltage is converted to a high stabilized dc output voltage with a galvanic separation requirement. Existing system: A high step-up DC-DC converter is typically used to convert a low-voltage DC energy source to that of a higher-voltage DC before connecting it to a DC-AC inverter for grid-connected applications. Solar photovoltaics (PVs) and fuel cells (FCs) are low-voltage DC energy sources used in power conditioning systems (PCSs). To interlink PVs or FCs to 230-Vac single-phase or 3 x 400-Vac residential loads, a two-stage DC-DC-AC grid-connected inverter is widely used due to its simple control. Proposed system: A QSB-based isolated step-up DC-DC converter was proposed in this paper. The proposed converter can operate in either short-circuit mode or open-circuit mode without causing any damage to the power converter. In addition, the input current of the proposed converter is continuous. Thus, the proposed converter can reach the required reliability without the need for any additional components. Because the VDR and shoot-through duty cycle are used to boost voltage, the turn ratio of the isolated transformer is significantly reduced. Compared to the QZSbased isolated DC-DC converter, the proposed converter uses fewer passive components. Therefore, the size, weight, and cost of the proposed converter are reduced. Circuit diagram: Advantages: Uses one less capacitor with a lower capacitance and one less inductor with a higher inductance; lower current rating on both switches and diodes; higher boost factor with the same parasitic effect; and higher efficiency. Reference: [1] C. T. Pan and C. M. Lai, “A high-efficiency high step-up converter with low switch voltage stress for fuel-cell system applications,” IEEE Trans. Ind. Electron., vol. 57, no. 6, pp. 1998–2006, Jun. 2010. [2] Y. P. Siwakoti, P. C. Loh, F. Blaabjerg, S. J. Andreasen and G. E. Town, "Y-source boost DC/DC converter for distributed generation," IEEE Trans. Ind. Electron., vol. 62, no. 2, pp. 1059–1069, Feb. 2015. [3] A. I. Bratcu, I. Munteanu, S. Bacha, D. Picault and B. Raison, "Cascaded DC–DC converter photovoltaic systems: power optimization issues," IEEE Trans. Ind. Electron., vol. 58, no. 2, pp. 403-411, February 2011. [4] G. Wu, X. Ruan and Z. Ye, "Nonisolated high step-up DC–DC converters adopting switched-capacitor cell," IEEE Trans. Ind. Electron., vol. 62, no. 1, pp. 383-393, January 2015.