Power Quality Intensification using DSTATCOM

The most difficult thing is maintenance of the electrical power quality so as to make it lie within the acceptable limits. There are many disadvantages of poor and low power quality. It may result in higher power losses, abnormal and weird behavior of electrical equipment, and interference with the close communication lines, poor voltage profile, harmonics, sag and swells within the voltage & poor and low distortion issues. The increased use of power electronic devices has increased the tension on power system as it leads to generation of voltage and current harmonics and it also increases the reactive current. Nowadays, power electronic devices are used by the industries for many reasons like variable voltage, variable frequency and current control in order to get accurate controllability, better and higher efficiency, faster response and most importantly to make the devices compact in size. The fundamental problem here is the non-sinusoidal current of power electronic devices e.g. rectifiers and inverters that not only contain the fundamental component but also the harmonic components. The main problem arises because of the switching actions which these power electronics devices exhibit such as MOSFET, BJT, SCR, IGBT etc. Because of this switching action these devices acts as non-linear loads. In the last decade there has been several research works presented for the improvement of flicker perturbations between different consumers. In this research work, an improved D-STATCOM is proposed for the improvement of the problems that are encountered which portrays better power quality of output as compared to other power improvement methods such as STATCOM and others. For the comparison of proposed method, different parameters such as active power, reactive power and the most important parameter that is total harmonic distortion. The THD of proposed method is also observed to be improved.