Design and Implementation of Robust H∞ Control for Improving Disturbance Rejection of Grid-Connected Three-Phase PWM Rectifiers

• Published in: Energies (Basel) 2024-05, Vol.17 (9), p.2166
• Main Authors: Ait Ramdane, Naima, Rahoui, Adel, Boukais, Boussad, Benkhoris, Mohamed Fouad, Ait-Ahmed, Mourad, Djerioui, Ali
• Format: Article
• Language: English
• Subjects: Closed loop systems; Controllers; Decomposition; disturbance rejection; Electric power; Engineering Sciences; H-infinity control; Robust control; three-phase pulse width modulation (PWM) rectifier; unbalanced grid voltage
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en17092166

In response to the high performance requirements of pulse width modulation (PWM) converters in grid-connected power systems, H-Infinity (H∞) control has attracted significant research interest due to its robustness against parameter variations and external disturbances. In this work, an advanced robust H∞ control is proposed for a grid-connected three-phase PWM rectifier. A two-level control strategy is adopted, where cascaded H∞ controllers are designed to simultaneously regulate the DC bus voltage and input currents even under load disturbances and non-ideal grid conditions. As a result, unit power factor, stable DC bus voltage, and sinusoidal input currents with lower harmonics can be accurately achieved. The design methodology and stability of the proposed controller are verified through a comprehensive analysis. Simulation tests and experimental implementation on a dSPACE 1103 board demonstrate that the proposed control scheme can effectively enhance disturbance rejection performance under various operating conditions.