Abstract
Harmonics and increasing number of switches and DC sources for increasing level is the major issue in the cascaded multilevel inverter for the application of medium and high voltage power system applications. In this paper several new techniques are used to reduce the switches and DC sources, which overcome the disadvantages of cascaded multilevel inverter. The THD values for various levels (seven & nine) are compared with and without PWM technique.
Highlights
Recent advancement of medium and high voltage power system applications like StaticVar Compensator (SVC), Flexible AC Transmission Systems (FACTS) devices, HVDC transmission systems necessitates the presence of Multilevel Inverter [1]
Various multilevel converters structures are reported in the literature, amongst them cascaded multilevel inverter appears to be superior to other multilevel inverter topologies in its application at high power rating due to the compact size, modularized circuit layout, control and reduced potential of electrical shock [3]
As several soft switching techniques are avail, the Sinusoidal Pulse Width Modulation (SPWM) technique is used for its capability of reducing even the lower order harmonics which is the main counterpart in the power quality domain [5]
Summary
Recent advancement of medium and high voltage power system applications like StaticVar Compensator (SVC), FACTS devices, HVDC transmission systems necessitates the presence of Multilevel Inverter [1]. The growing demands of the industrial drives of high voltage needs the use of increasing level of Multilevel level inverter whose size is bulky due to the individual DC source and large number of switching units, causing increased switching losses and harmonics .To meet a quality output across the load, it is very essential to reduce the DC sources, switching units as well as the harmonics [4]. PWM techniques are used to reduce the THD, order of the harmonics in the output voltage [4]. As several soft switching techniques are avail, the SPWM technique is used for its capability of reducing even the lower order harmonics which is the main counterpart in the power quality domain [5]
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