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Applications such as electrolysis, electrowinning, DC arc furnaces and plasma torches require high-current (several kA) power supplies at low-voltage levels (few hundreds of volts). In this study, conventional rectifier topologies (diode-and thyristor-based multi-pulse rectifiers with on-load tap changing transformer and chopper-rectifier) used for high-current, variable-voltage applications are reviewed along with recent advancements in the field. The main applications themselves are also discussed. Issues with conventional topologies are highlighted. Power quality techniques like passive and active filters are discussed for power factor and current harmonics compensation. Advanced medium-to high-frequency transformer-based topologies (with current and voltage source rectifiers) are discussed along with simulation results.

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In that time the principle of speed control was based on steady Abstract-The induction motor is well known as the state considerations of the induction machine. The vf control workhorse of industry. The development of variable speed was one outcome and even today it is commonly used for the induction motor drives has a long history of more than four open-loop speed control of drives with low dynamic decades. Today's sophisticated industrial drives are the result of the extensive research and development during the last decades. requiements. Alon with that,wn ctll

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