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Modulation and Control design aspects of Microprocessor Based Multilevel Inverter

Lalit Mohan, Dr. S.K. Agarwal, Dharam Vir

A multilevel inverter is a system that generates voltage output from several levels of dc voltages as inputs. The input source may be batteries, solar panels and charged capacitors etc .Multilevel inverters may be used to reduce the harmonics, enables the ac voltage to be increased (produced) without a transformer and to repair any sag or dip in power grid. Also the elimination of low frequency harmonics from the ac mains at different levels and the size of the ac inductances can be reduced. Due to these attractive features, several control strategies of multilevel inverter have been developed. The coming out of multilevel inverter/converters has been increase since the last decade. These new types of inverters are appropriate for high voltage and high power application due to their capability to create waveforms with better harmonic spectrum. Several topologies have been introduced and widely calculated for benefit in different areas and drive applications. With these topologies, the multilevel cascaded inverter was introduced in SVC compensation and drive systems. This is, in fact the amalgamation of conventional multilevel inverter and PWM based inverter. In this paper we work on modulation and control of microprocessor based design aspects nine level inverter (converter) and its harmonics analysis. Also work has been done on PWM based inverter and Selective Harmonics Elimination to reduce the harmonics further, Selective Harmonics Elimination is actually the combination of conventional multilevel inverter and PWM based inverter.