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FACTS Family for Voltage Sag Alleviation: Performance Study and Analysis

Voltage sag is one of the most considerable problems in power distribution system. In this work the performance study of the FACTS family; i.e. the distributed compensator (DSTATCOM), dynamic voltage restorer (DVR), and pulse width modulation (PWM) switched auto-transformer, is carried out, with regard to the number of switching devices and the valid compensating capability in comparison to the generally known compensators. Each of the aforementioned FACTS devices is investigated and analyzed. The proposed control schemes used to control these devices are simulated by using MATLAB/Simulink software. Comparative analysis based on the implementation of these devices in compensating voltage sag is presented in this study. The main contribution of this work is the study and analysis of the behavior of FACTS family in reducing the voltage imbalance, the selection of the device most suitable to the application and also the control of the device such that desired performance can be achieved such that the power quality of the distribution networks is effectively improved.