Comparison of Dynamic Stability Response of A SMIB with PI and Fuzzy Controlled DPFC

Budi Srinivasarao,Swathi Sharma,G Sreenivasan

doi:10.11591/ijeei.v5i3.293

Abstract

Consumer utilities are non –linear in nature. This injects increased flow of current and reduced voltage with distortions which cause adverse effect on the stability of consumer utilities. To overcome this problem we are using a modern Flexible Alternating Current Transmission System controller i.e. distributed power flow controller (DPFC). This controller is similar to UPFC, which can be installed in a transmission line between the two electrical areas. In DPFC, instead of the common Dc link capacitor three single phase converters are used. In this paper we are concentrating on system stability (oscillation damping). For analyzing the stability of a single machine infinite bus system (SMIB) we have used PI controlled Distributed Power Flow Controller (DPFC) and Fuzzy controlled DPFC. All these models are simulated using MATLAB/SIMULINK. Simulation results shows Fuzzy controlled DPFC are better than PI controlled DPFC. The significance of the results are better stability and constant power supply.

Highlights

Power quality means the interaction of electrical power with the electrical equipment
The present paper introduces a new device called Distributed power flow controller (DPFC).It is a combined converter i.e. it consists of both series and shunt converters
Block Diagram In this paper, for a single machine infinite bus system dynamic stability analysis was done with PI and fuzzy controlled distributed power flow controller (DPFC)

Summary

Introduction

Power quality means the interaction of electrical power with the electrical equipment. While transferring power from generation to consumer utility majority of problems at transmission line are Voltage and current variations To overcome this sort of problems power electronic devices such as FACTS controllers like unified power flow controller (UPFC), STATCOM etc. Consrtuction And Working of DPFC The DPFC structure is different from the other FACTS controllers especially with UPFC i.e the common DC link capacitor and 3rd order harmonic currents are used to exchange active power [8]. Each converter within the DPFC is independent and has a separate DC link capacitor to provide the required and sufficient DC voltage. A process or the technique which allows exchange of active power between converters without having DC link is the prime requirement for DPFC [9]. It allows exchanging the active power through the AC terminals of the converters

Series pass converter filter

Series control

From central control

PWM generator

Conclusion