Projeto de controlador robusto para rastreamento de tensão aplicado a um restaurador dinâmico de tensão (DVR).

Abstract

The Dynamic Voltage Restorer (DVR) is a power electronics based solution for mitigation of voltage sags and swells effects on sensitive loads, which basically injects voltages in series with the grid. Typically the controller structure for a DVR is composed by an inner current loop and an outer voltage loop. Usually a proportional or a proportional-integral controller is used for the current loop and a resonant controller is used for the voltage loop. This paper presents the design of a robust controller for the voltage tracking loop of a DVR that guaranties the robust stability against load parameters variation. Moreover, the proposed controller assures the tracking of a sinusoidal voltage waveform, as well the rejection of the non linear load current influence, both with a pre specified error. The voltage controller design is based on H∞ mix-sensitivity parameter specification approach. All the performance and robustness requirements are specified and analyzed based on the frequency response plot of closed loop transfer function (sensitivity and complementary sensitivity functions). The proposed controller performance is validated by simulation and by experiments carried out on a low scale DVR prototype.