Abstract
In this work, an enhanced Exponential Reaching Law SMC (EERL-SMC) is proposed for a Three phase Transformerless Hybrid series Active power Filter (THSeAF) based on voltage source converters (VSC) to mitigate the power quality issues like voltage distortions and current harmonics. Generally the power quality issues had become quite common in the Electrical Distribution Systems (EDS) due to the usage of power electronic converters. To mitigate these power quality issues, a THSeAF is used in this work. An EERL-SMC is proposed to generate firing pulses to the IGBT switches of the inverter in a THSeAF for voltage and current distortions occurring on the supply side. The voltage and current references are generated using stationary reference frame theory. For obtaining the stability of the system, a mathematical model is derived. Simulations have been performed on PSCAD v4.6 with the EERL-SMC applied on the source side of the system. It is observed through simulations that the THSeAF compensates for sag, swell and voltage harmonics with less total harmonic distortion (THD). A power factor improvement is also observed during the simulation work. The controller performance is found to be robust with less settling time, less steady state error, no chattering during the mitigation of the power quality issues. Desired compensation and THD within the limits are obtained which encourages for effective usage of this topology with EERL-SMC in distribution systems. It can be an alternative to a higher order SMC like super twisting algorithm etc.
Published Version
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