Adaptive super-twisting control for grid-following inverter under unbalanced current injection

Abstract

This paper proposes a novel adaptive Super-Twisting control algorithm for grid-following inverters, with a particular focus on meeting the positive-sequence current injection grid codes requirements and addressing negative-sequence current injection to mitigate oscillations under unbalanced operation. The aim is to fulfill the robustness requirements under Low-Voltage Ride-Through scenarios while exhibiting a smooth and rapid performance under steady-state operation conditions. Its response is compared against conventional PI and PR controllers in terms of compliance with grid code requirements and control performance quality in a simulation environment. To evaluate real-world feasibility, real-time simulation and Hardware-in-the-Loop testing are used to evaluate its impact on line-protection response.This paper proposes a novel adaptive Super-Twisting control algorithm for grid-following inverters, with a particular focus on meeting the positive-sequence current injection grid codes requirements and addressing negative-sequence current injection to mitigate oscillations under unbalanced operation. The aim is to fulfill the robustness requirements under Low-Voltage Ride-Through scenarios while exhibiting a smooth and rapid performance under steady-state operation conditions. Its response is compared against conventional PI and PR controllers in terms of compliance with grid code requirements and control performance quality in a simulation environment. To evaluate real-world feasibility, real-time simulation and Hardware-in-the-Loop testing are used to evaluate its impact on line-protection response.