PWM Based Autotransformer for Voltage Sag Control Using MATLAB

Authors: Archita kanungo, Ankur malhotra

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Abstract

This paper present voltage sag control technique is besides custom power devised like dynamic voltage restorer and STATCOM as a solution for mitigation of voltage sag and swell. In this paper proposed system has less number of switching devices and has good compensating capability in comparison to commonly used compensators. Voltage sag is literally one of power quality problem and it become severe to industrial customers. Voltage sag can cause miss operation to several sensitive electronic equipment’s. That problem can be mitigating with voltage injection method using custom power device, Dynamic Voltage Restorer (DVR) or controlling the PWM signal. 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.

Introduction

The electric power technique is considered to be composed of three functional blocks generation, transmission and distribution and reliable power system, the generation unit must produce adequate power to meet customer’s demand, the transmission systems must transport bulk power over long distances without overloading must deliver electric power to each customer’s premises from bulk power. The distribution system locates the end of power system and is connected to the customer directly,

Conclusion

This paper present modeling and simulation of standalone three phase voltage sag control using MATLAB/SIMULINK. The voltage sag compensator based on PWM switched autotransformer has been presented in this study. Control circuit based on RMS voltage reference is discussed. The proposed technique could identify the disturbance and capable of mitigating the disturbance by maintaining the load voltage at desired magnitude within limits.