Three-Phase Inverter Control with LC Filter Output for Uninterruptible Power Supply

This paper presents research on implementing predictive control for three-phase inverters with output LC filters for uninterruptible power supply (UPS) applications. The goal is to achieve high-quality voltage regulation and fast dynamic response under various load conditions, including nonlinear loads. This model predicts the future behaviour of controlled variables, such as the inverter's output voltage and current. Constraints, such as voltage and current limits, are considered in control design to ensure safe operation. The optimization problem in predictive control is solved at each control time interval, aiming to minimize the cost function while satisfying the system constraints. The cost function can be customized based on specific goals, such as reducing total harmonic distortion (THD) in the output voltage or optimizing performance. The resulting control actions will provide optimal drive for the inverter to regulate the output voltage. With MATLAB/Simulink tools, we assess the efficacy of the suggested control strategy by presenting simulation results across various linear and nonlinear loads. The results demonstrate that the feedforward control scheme produces low THD and satisfactory dynamic response.