GIFL Gain Choosing Technique for Fast Voltage Sag/Swell Detection

This paper presents a technique to improve the response of single-phase voltage sag/swell detection using generalized Integrator with a feedback loop (GIFL). The GIFL provides an orthogonal signal required for evaluating the instantaneous voltage magnitude. For the GIFL, constant gain K is the key influencing its overall performance. Then, the main objective of this paper is to introduce a method for choosing the best GIFL's constant gain; speed and overshoot of the GIFL are considered with varying gain K. Both simulation and experiment were carried out in order to confirm the idea proposed in this paper; the experimental results match the simulations as expected. This technique could find its application in order to enhance the performance of FACTS devices used in single-phase power systems, especially for precise power compensation during fast transients.