Mr. K. Ravi Sankar¹, Mr. Dr.V. Kamaraju² and Mr. Dr. R. Srinivasa Rao^3
1Assoc. Professor, Department of EEE, Coastal Institute of Technology and Management,Vizag, Andhra Pradesh, India. ²Professor, Department of EEE, Mahaveer Institute of Science and Technology, Bandlaguda, Hyderabad, Telangana, India ³Professor, Department of EEE, University College of

Electricity demand has been increasing due to the increase of population and industries. Hence it is very important to feed the demand with quality of generation. Improvement of power quality is the greater concern in advanced power system element, it is essential to congregate the need of energy by employ the renewable energy generating sources like pv, fuel cell, biomass, wind, etc and utilizing many more applications like grid interconnected systems, power quality improvement. The situations like harmonic, reactive power exchanging, power factor correction, balanced and un-balanced voltage variations & so on, due to greater effect on highly susceptible loads are to be encouraged in power distribution system. To enhance these circumstances, custom power appliances are used to achieve high grid voltage stability. In this paper, a voltage distortions controlled D-STATCOM based on fuzzy controller is a meticulous power appliance for enhancing harmonic distortions from high power semiconductor switching device, exchanging the both active & reactive power, defend the gird stability by implementing DG technology, to regulate the power quality issues in power distribution network. This paper implements the comparative analysis of PI and Fuzzy controlled DSTATCOM with energy backup scheme, controlled by pwm control technique and founded that fuzzy based IPQ theory for generation of reference current signals improves the power quality than PI based IPQ theory and this analysis is dynamically evaluated with Matlab/Simulink.

D-STATCOM, balanced-un-balanced voltage variations, fuzzy controller and Harmonics.