Basic Multi-level Converter Systems-A Power Quality Study

Power electronic, is the art of converting electrical energy from one form to another in a clean, efficient, compact and robust manner for convenient utilization. It has found an important role in modern technology being core of power and energy control. Electric current by customer appliances draw from grid network flows through the impedances of the grid system and causes a voltage drop, which affect the voltage delivered to the domestic or industrial customers. Hence, both the voltage quality and current quality are necessary. Grid network responsible for the voltage quality and customer at load side is responsible for electric current quality. The quality of the power supply is mainly affected by harmonics, flicker, sag, swell and outages. Due to these all problems system is affected and problems like fluctuations, voltage dip, heating of appliance, system shutdown are produced.To make a system stable and improve the Power Quality (PQ), power electronics interface with total harmonic reduction needs to be connected between supplier and load.