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Abstract
This paper presents comparative study of Total Harmonic Distortion (THD) and its individual harmonic contents without grid and with grid for Diode clamped multi level inverter (DCMLI) and Flying capacitor clamped multilevel inverter (FCMLI) based Doubly Fed Induction Generator (DFIG) employing PI and Fuzzy logic controller (FLC). Simple method to control for a variable speed wind energy conversion system with a DFIG is connected to the grid through a diode rectifier and a diode clamped multilevel inverter (DCMLI). The DC-link voltage is controlled through a DC-DC boost converter to keep the DC voltage at constant value. Inverter is controlled by sinusoidal pulse width modulation technique, which supplies power to the grid. The THD and its harmonic content are studied for different wind speeds. DFIG fed flying capacitor multi level inverter (FCMLI) based WECS connected to load as well as grid. FCMLI is controlled through sinusoidal pulse width modulation. Voltage and current harmonics are studied. The results of both multilevel inverters are compared. It shows that the level of harmonic content of two types of multilevel inverters working at different wind speeds indicates that Total Harmonic Distortion (THD) for DCMLI has given best results.
Highlights
The fossil fuel prices are rapidly increasing, that had affected the economic growth of many developing countries
The doubly fed induction generator (DFIG) is connected to the grid through the stator, its rotor is connected to the grid through diode clamped multilevel inverter
The aim of this work is to compare the total harmonic distortion and its individual harmonic contents obtained from the Diode clamped multi level inverter (DCMLI) and Flying capacitor clamped multilevel inverter (FCMLI) based wind energy conversion system(WECS)
Summary
The fossil fuel prices are rapidly increasing, that had affected the economic growth of many developing countries. The burning of fossil fuels will emit the green house gases, it will affect the global climate. There is a need for alternative energy sources which does not emit any green house emission. The increasing use of power electronics and converters ( for wind turbines) are injecting more harmonic currents onto the system. Harmonics cause higher losses through increased currents in the power system. To diminish these harmonics, desirable filter is required. Wind energy conversion system does not pollute the atmosphere does not emit any green house gases. The aim of this work is to compare the total harmonic distortion and its individual harmonic contents obtained from the DCMLI and FCMLI based wind energy conversion system(WECS)
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