Compensation of disturbances from the electrical network using the Dynamic Voltage Restorer (DVR)

Abstract

This work presents the analysis of the necessary requirements for the control of the compensation of electrical network disturbances (sag, swell and interruption of voltage), using the Dynamic Voltage Restorer (DVR), in order to protect the sensitive load. The control system was implemented based on the synchronous coordinate system “dq”, using the Park transform, since it is a symmetrical and balanced three-phase system. This methodology was adopted as a way of simplifying the project and reducing the number of controllers applied. In a first stage of the control project, it was possible to identify the DVR transfer function by estimating some characteristic parameters such as: damping factor (ζ), natural frequency (ωn) and gain (K). In a second step, the controllers were designed by the Internal Model Control (IMC) method, applying them in the complete simulation of the DVR. With this, tests were carried out in the simulation, inserting disturbances with amplitudes and varied durations, observing the dynamic behavior of the DVR. Finally, in the simulation results section, it was observed the compensation of the disturbances inserted in the network, protecting the critical load and validating the design and development of the DVR.