Control Method for Improving the Voltage Utilization Factor of Multilevel Inverters Considering Co-Generation System Voltage Fluctuation
S. Narasimha1, M. Sushama2
1S. Narasimha, Dept. of E.E.E, Research Scholar, JNTUH, Kukatpally, Hyderabad, India.
2M. Sushama, Dept. of E.E.E, Professor, JNTUH, Kukatpally, Hyderabad, India.
Manuscript received on July 22, 2014. | Revised Manuscript received on August 15, 2014. | Manuscript published on August 30, 2014. | PP: 64-67  | Volume-3 Issue-6, August 2014.  | Retrieval Number:  F3307083614/2013©BEIESP

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Abstract: Given the threat of diminution of fossil fuels and several environmental concerns, cogeneration systems using natural energy and fuel cells have begin widespread. In such systems, the generated power is converted into a DC voltage, stored in batteries, and then converted into an AC voltage by inverters. The generated power is often unsteady and large voltage fluctuations. In an attempt to improve efficiency and decrease costs, a simple control method for improving the voltage utilization factor of multilevel inverter. This paper describes a control method which combined feed back control of output voltage with the improvement on voltage utilization factor that the superposition ratio is controlled in the three phase multilevel inverter application to smart grid/co-generations. The aim of this control method is to realize improvement on the controllability and absorption of the fluctuation of the DC voltage by superimposing the moderate third harmonic wave. It is applied to the multilevel inverter, and the operation principle and features are explicated, By simulation/MATLAB.
Keywords: Multilevel inverter, Improvement of voltage utilization factor, Feedback control, DC-link voltage, Co-generation.