Title: Fuzzy logic controlled dynamic voltage restorer for mitigation of various power quality problems

Authors: Shubhendra Pratap Singh; Abdul Hamid Bhat; Anupam Kumar

Addresses: Department of Electrical Engineering, National Institute of Technology Srinagar, Kashmir, India ' Department of Electrical Engineering, National Institute of Technology Srinagar, Kashmir, India ' Department of Electrical Engineering, National Institute of Technology Srinagar, Kashmir, India

Abstract: Dynamic voltage restorer (DVR) is used to protect sensitive loads from harmonic distortion, voltage sag/voltage swell, and unbalance in supply voltage economically. In this paper, fuzzy logic-based control scheme has been developed for the production of compensating voltages for controlling DVR. Linear as well as nonlinear loads can be controlled by this scheme. A three-phase programmable voltage source is taken for producing voltage sag/swell and voltage harmonic distortion and this voltage is compared with a reference voltage of same magnitude. At the time of any disturbance, an error signal is generated which is processed by controller based on fuzzy logic theory. The controller generates the gate pulses for PWM inverter energised by a DC source and inverter injects the missing voltage into the distribution line and tightly regulates the voltage at the load terminals. By extensive simulation studies in MATLAB/Simulink and SimPowerSystems environment, the above control strategy is tested. The simultion results for voltage harmonic distortion, voltage sag/swell, and voltage unbalanced mitigation using the proposed control algorithm prove the effectiveness of DVR.

Keywords: dynamic voltage restorer; DVR; voltage sag/swell; total harmonic distortion; THD; power quality; custom power devices; IEEE standards.

DOI: 10.1504/IJIED.2017.087607

International Journal of Industrial Electronics and Drives, 2017 Vol.3 No.4, pp.185 - 198

Received: 07 Dec 2016
Accepted: 25 Jan 2017

Published online: 23 Oct 2017 *

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