Robust current control technique for variable DC-link Voltage Source Inverters for Renewable Energy Systems

This paper presents a model predictive strategy for a three-phase, two-level Voltage Source Inverter (VSI) and three-level Diode-Clamped Converters (DCCs) with AC filter for Renewable Energy Systems (RES) applications. The renewable energy systems model is used in this paper to investigate the system performance when power is supplied to Resistive-Inductive load (RL-load). This strategy allows for fast load current control while keeping the balance of the DC-link capacitor voltages. The robustness of control strategy under variable DC-link voltages for RES application is done in terms of the Total Harmonic Distortion (THD) and tracking behaviour of the reference currents with all DC-link voltage values. The co-simulation is carried out using MATLAB/Simulink with PSIM software to test the effectiveness and robustness of FS-MPC for two and three-level VSI with AC filter for resistive-inductive load supplied by a renewable energy system.