The multi-input dc/dc boost converter is proposed in this paper. The proposed converter uses two sources such as wind, photovoltaic(PV) and battery as a storage element for hybridizing alternative energy sources. This converter draws the power from two different sources depending upon climatic condition and deliver it to the dc load individually or simultaneously. The system is applicable for DC loads which requires 350V and 8A. Supplying the output load, charging or discharging the battery can be made by the PV and the wind power sources individually or simultaneously. The output voltage regulation and power flow control can be achieved by controlling the duty ratio of the four switches. This converter structure uses only four power switches that are independently controlled with four different duty ratios for controlling the whole operation of the converter. Depending on utilization state of the battery, three different power operation modes are defined for the converter either charging or discharging action to be taken place. Simulation has been carried out by using MATLAB SIMULINK software.

1. W. Jiang and B. Fahimi, "Active current sharing and source management in fuel cell-battery hybrid power system," IEEE Trans. Ind. Electron. ,vol. 57, no. 2, pp. 752–761,Mar. 2008.
2. R. J. Wai, Ch. Y. Lin, J. J. Liaw, and Y. R. Chang, "Newly designed ZVS multi-input converter," IEEE Trans. Ind. Electron. , vol. 58, no. 2, pp. 555–566, Feb. 2011.
3. J. L. Duarte, M. Hendrix, and M. G. Simoes, "Three-port bidirectional converter for hybrid fuel cell systems," IEEE Trans. Power Electron. , vol. 22, no. 2, pp. 480–487,Mar. 2006.
4. N. Kato, K. Kurozumi, N. Susuld, and S. Muroyama, "Hybrid powersupply system composed of photovoltaic and fuel-cell systems," in Proc. Int. Telecommun. Energy Conf. , 2001, pp. 631–635, Dec 2001.
5. K. Rajashekara, "Hybrid fuel-cell strategies for clean power generation," IEEE Trans. Ind. Appl. , vol. 41, no. 3, pp. 682–689, May/June2005.
6. P. Thounthong, S. Rael, and B. Davat, "Control strategy of fuel cell and supercapacitor association for a distributed generation system," IEEE Trans. Ind. Electron. , vol. 56, no. 6, pp. 3225–3233, Dec. 2007.
7. O. C. Onara,M. Uzunoglu, andM. S. Alam, "Modeling, controlandsimulationofanautonomouswindturbine/photovoltaic/fuelcell/ultracapacitorhybridpower system," J. Power Sources. , vol. 185, no. 2, pp. 1273–1283, Apr. 2008

Dc–dc Boost Converter Photovoltaic/wind/battery Hybrid Power System