Abstract
Cascaded structured multilevel inverters are gaining lot of importance due to their simple structure and easiness in implementation. In this paper, the optimum selective harmonic elimination method is employed for a nine level inverter to suppress the selected lower order harmonic, which reduces the total harmonic distortion of the inverter considerably. The Newton rapson algorithm is employed in finding the switching angles that minimizes certain lower order harmonics. The order of the harmonics that are eliminated are third, fifth, and seventh harmonics. All the simulation results included for a nine level inverter using SIMULINK. Index Terms: Nine level MLI, Control of inverter, Modular Inverter.
Highlights
Even though lots of topologies are developed in the power electronics area, power quality is still not achieved appropriately
If the number of levels in a MLI is fixed, the other factor that affects the quality of the output voltage is the control method that is employed in the MLI
The only method which is having the feature of control of all the harmonics individually is the selective harmonic elimination or mitigation technique
Summary
Even though lots of topologies are developed in the power electronics area, power quality is still not achieved appropriately. If the number of levels in a MLI is fixed, the other factor that affects the quality of the output voltage is the control method that is employed in the MLI These control techniques are usually known as modulation methods in MLIs. Several types of modulation methods are available in literature. The only method which is having the feature of control of all the harmonics individually is the selective harmonic elimination or mitigation technique With this method, it is possible to reduce or mitigate the any harmonic that is available in the waveform. It is possible to reduce or mitigate the any harmonic that is available in the waveform This method can be applied to any inverter with any number of levels.
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