Effect of PI controller on efficiency of dynamic voltage restorer for compensation of voltage quality problems

This paper describes and demonstrates the effect of a PI controller in a novel design of a dynamic voltage restorer (DVR) which mitigate power quality problems like sags, swell, and phase jumps by injecting minimum active power in system and provides the constant power at load side without any disturbance. Along with PI controller the design of this DVR presented here includes the combination of PWM-based control scheme and dq0 transformation technique in control part of its circuitry, which enables it to minimize the power rating and to response promptly to voltage quality problems faced by today´s electrical power industries. An immense knowledge of power electronics was applied in order to design and model of a complete test system solely for analyzing and studying the response of this efficient DVR. In order to realize this control scheme of DVR MATLAB/SIMULINK atmosphere was used. The results of proposed design of DVR´s control scheme, having PI controller, are compared with the results of existing classical DVR, without a PI controller, which clearly shows its high efficiency and successful compensation of voltage quality problems by injecting minimum active power.