A Novel Three Phase Five Level Inverter for Hybrid Solar–Wind Energy System
At present, the whole world is going through a severe energy crisis due to the non replenish able nature of fossil fuels which are major sources of conventional energy. In addition to limited availability of conventional energy sources, they also contribute heavily towards environmental pollution. In this scenario, renewable energy sources has got significant role to play in meeting global energy demand. Solar and wind energy systems are the most popular types of grid connected renewable energy systems. We are presenting a new system configuration for interfacing the hybrid solar and wind energy system to the grid. This configuration is flexible and it allows these two renewable energy sources to supply the load together or independently depending upon their availability. The configuration proposed here uses a modified five-level inverter for converting DC voltage generated from renewable energy sources to AC voltage at desired frequency. The usage of five-level inverter reduces Total Harmonic Distortion (THD) in output voltage and helps in eliminating bulk filters required at the output side. Simulation study of the proposed system is carried out using MATLAB Simulink.
 Chaturvedi, P. ; Jain, S. ; Agarwal, P., “Carrier-Based Neutral Point Potential Regulator With Reduced Switching Losses for Three-Level
Diode-Clamped Inverter,” IEEE Trans. Ind. Electron., vol. 61, no. 2, pp. 613–624, Feb. 2014
 Ke Ma ; Blaabjerg, F., “Modulation Methods for Neutral-Point-Clamped Wind Power onverter Achieving Loss and Thermal Redistribution under Low-Voltage Ride-Through,” IEEE Trans. Ind. Electron., vol. 61, no. 2, pp. 835–845, Feb. 2014
 M. Calais and V. G. Agelidis, “Multilevel converters for single-phase grid connected photovoltaic systems— An overview,” in Proc. ISIE 1998, vol. 2, pp. 835–845, Feb. 2014
 S. B. Kjaer, J. K. Pedersen, and F. Blaabjerg, “A review of single-phasegrid connected inverters for photovoltaic modules,” IEEE Trans. Ind. Appl., vol. 41, no. 5, pp. 1292–1306, Sep./Oct. 2000
 L. M. Tolbert, F. Z. Peng, “Multilevel Converters as a Utility Interface for Renewable Energy Systems,” IEEE Power Engineering Society Summer Meeting, Seattle, Washington, July 15-20, 2000, pp. 1271-1274
 S. A. Khajehoddin, A. Bakhshai, P. Jain, “The Application of the Cascaded Multilevel onverters in Grid Connected Photovoltaic Systems,” IEEE
Canada Electrical Power Conference, 25-26 Oct. 2007, pp. 296-301
 S. Alepuz, S. Busquets-Monge, J. Bordonau, J. Gago, D. Gonzalez, and J. Balcells, “Interfacing renewable energy sources to the utility grid using a three-level inverter,” IEEE Trans. Ind. Electron., vol. 53, no. 5, pp. 1504–1511, Oct. 2006
 Jeyraj selvaraj and Nazrudin A.Rahim, “Multilevel inverter for grid connected pv system emplyoing digital PI controller,” IEEE Transactions on Industrial Electronics, vol.56, No1.,January 2009.
Shagar Banu M, Vinod S, Lakshmi.S, “Design of DC-DC converter for hybrid wind solar energy system,” 2012 International conference on
Computing Electronics and Electrical Technologies.