Understanding of voltage sag mitigation using PWM switched autotransformer through MATLAB Simulation

摘要

Custom Power devices like Dynamic voltage restorer and STATCOM are normally employed as a solution for mitigation of voltage sag and swell. This paper presents modeling and analysis of PWM switched autotransformer that can compensate during voltage sag and swell conditions. The proposed system has less number of switching devices and has good compensating capability in comparison to commonly used compensators. Simulation analysis of three-phase compensator is performed in MATLAB/SIMULINK and performance analysis of the system is presented for various levels of sag and swell. Also the compensator can maintain the load powers both real and reactive powers constant. Simulation results are presented for various conditions of sag and swell disturbances in the supply voltage to show the performance of the new mitigation technique.