Design of Robust Structured Control Strategy for Single-Phase Dynamic Voltage Restorer

In this paper a single-phase transformerless Dynamic Voltage Restorer (DVR) with uncertain filter parameters is presented. A robust control strategy is implemented through a non-smooth H∞ technique by weighting selections. Besides concerning a robust performance in presence of parametric uncertainty, it also considers voltage sag/swell and harmonics compensation. The performance of the DVR compensation was evaluated from the impact caused in the load voltage from the variation in the parameters of the passive converter filter. Extensive simulation results are presented to verify and validate the effectiveness of proposed control strategy, showing that the structured controller is suitable to diverse scenarios increasing the operation point of the system.