Implementation of Sliding Mode Controller to Regulate the Speed for Series Connected Chopper Fed Separately Excited DC Motor Drive

Abstract

AbstractMultilevel static power conversion technology imbibes the ability to process high voltage and generate multi-tier voltage waveforms with high spectral quality. This technology is increasingly being used [1] in power converters and power conditioning circuits. Multilevel power converter is a general term applied to power converters with topologies capable of synthesizing multi-tier voltage waveforms and processing high voltages, by means of series connections of active devices to offer three or more discrete DC voltage [2] levels. Interconnection of power devices to split DC rail increases the voltage handling capability of these converters for the given power devices. Series-parallel DC–DC conversion systems in which multiple standardized converter modules are connected in series or parallel [3] at the output and input sides. Multiple connected DC–DC conversion systems attract more attention [4] in recent years, and are being to be widely used in various applications [5]. DC choppers are used to convert unregulated DC input voltage into a controlled DC output voltage at a desired level. They are widely preferred in the switched mode power supplies, and DC motor drives applications. Besides DC choppers find their role as interfaces between the DC systems [6] of different [7] voltage levels. The output voltage of PWM based [8] DC choppers are varied by varying the duty cycle. Buck converter is a subset of DC–DC converters. It is desired to explore new methodologies, so as to enable DC choppers to elicit better performance of DC Drives.KeywordsSlide mode controllerDC driveChopperSeries motor