Harmonic Reduction Using SVPWM and Active Harmonic Filter and Their Comparative Analysis

Abstract

A large amount of harmonics is produced by the increasing practice of electronic equipments in energy distribution systems. It is owing to the nonsinusoidal currents expended in nonlinear loads. Non-linear loads include : • diode-rectifiers, • thyristor converters, • variable speed drives, • furnaces, • computer energy supplies, • UPSs, etc. Even though such devices are cost-effective, adaptable and power efficient, these possess the disadvantage of worsening the quality of power by generating harmonic currents as well as exhausting unnecessary reactive power. This phenomenon may lead to a lot of tribulations: e.g. resonance, undue neural currents, reduced power factor and much more. A dynamic role is played by Pulse Width Modulation Inverters in the area revolving around power electronics. PWM adjustable speed drives find numerous applications in several new industrial presentations requiring excellent performance. In recent times, expansions in the field of power electronics have given birth to a wide progress in such systems. Consequently, diverse circuit configurations, for example multilevel inverters are gaining a lot of popularity as well as creaing a substantial interest. The most prevalent pulse width modulation scheme which is conceivably the most efficient among other PWM techniques is Space Vector Modulated PWM (SVPWM) since it manages to produce high voltages accompanied with less total harmonic distortion as well as toils splendidly field oriented structures to achieve motor control. Space Vector PWM (SVPWM) is gaining a lot of importance owing to its relaxed digital realization and healthier dc bus operation. Elimination of a number of small order harmonics by implementing an appropriate harmonic elimination methodology can lead to an excellent quality spectrum of output. The emphasis of the project has been laid on induction motor on which the two methods of harmonic elimination technique has been executed – SVPWM and shunt active filter. The deliberation of a prototype of 3-phase voltage-source inverter centered on the concept of space vector can be easily found in this study. Simulation results have been shown clearly in the study which have been acquired with the help of MATLAB/Simulink to strengthen the claims we have made in this study. Finally, a comparative study has been made between the two methodologies discussed in order to decide which one is the better method to eliminate harmonics.