A Robust Control Scheme for Dynamic Voltage Restorer with Current Limiting Capability

In this paper, a second order sliding mode control scheme is utilized for outer voltage loop of three-phase fault current limiter-based dynamic restorer (FCL-DVR) instead conventional proportional integral/proportional resonance (PI/PR) controller. The new strategy improves the performance FCL-DVR against distortion. Furthermore, by using proposed robustness controller, can smoothly switch between FCL and DVR operation modes. Compared with other existing schemes, still work well under large current. MATLAB/Simulink simulation results demonstrate that robust to harmonics, sag swell. They also show effectively limit in different scenarios.