Power quality improvement of sugar factories dc motor drive using hybrid filter

Abstract

Power quality management is the main problem facing industry today. This problem is mainly due to the generation of electric network harmonics. The growing use of variable speed drives produces a large amount of harmonics in distribution systems because of the non-sinusoidal currents consumed by these drives. It is well known that for better quality of power, the voltage and current waveforms should be sinusoidal. But in actual practice it is somewhat distorted and this phenomenon is called “Harmonic Distortion”. Voltage harmonics are generally present in the utility power supply network. Even though electronic and non-linear devices are flexible, economical and energy efficient, they may degrade power quality by creating harmonic currents consuming excessive reactive power. Harmonic can be reduced using filters. Two types of filters have been utilized for harmonic distortions suppression namely passive and active filters. The present paper provides a method for designing a new hybrid (passive and active) power filters to reduce harmonic distortion and hence improve the power factor, reduce the cost and overcome all above problems. The simulation results certificate that the present hybrid filter (HAPF) causes perfect harmonics and reactive power compensation characteristics. In this case the total harmonic distortion (THD) meet standard values according to the IEEE 519/1992. The practical results of the studied dc motor drive system have been validated and compared with computer simulation MATLAB model results. The simulation results of this nonlinear studied system have been carried out with MATLAB Program 2010.