Three-phase pulse width modulation boost rectifier enhancement direct power control based on super-twisting algorithm

Introduction. Three-phase pulse width modulation (PWM) rectifiers are widely used in modern power conversion systems due to their high efficiency, controllability, and ability to provide high-quality energy conversion. They play a crucial role in applications such as motor drives, renewable energy integration, and power supplies, where a stable DC voltage and low harmonic distortion are essential. The conventional direct power control (DPC) method, based on a 12-sector switching table, is commonly employed for its simple implementation, reduced complexity, and fast dynamic response. Problem. Despite its simplicity and fast dynamic response, the classical DPC approach is highly sensitive to parameter variations and relies on a predefined switching table, which limits its robustness and current quality. Goal. To experimentally validate an improved control strategy for a three-phase PWM rectifier that enhances robustness and current quality by integrating the super-twisting algorithm (STA) into the conventional DPC framework. Methodology. The proposed STA-based DPC was implemented and tested on an experimental setup using a dSPACE DS1104 digital control board. Both the conventional DPC and the modified STA-based DPC were experimentally evaluated under the same operating conditions to ensure fair comparison. Results. Experimental results demonstrate that the STA-based DPC achieves a THD reduction from 11.85 % to 6.11 % and improves the stability of the DC-link voltage under parameter variations. These quantitative results confirm current quality, improved robustness and reduced chattering compared to the classical DPC. Scientific novelty. Integrating the STA into the DPC framework eliminates dependence on the predefined switching table and enhances robustness to system uncertainties. Practical value. The experimental validation confirms the feasibility and effectiveness of implementing the STA-based DPC in real-time applications, offering a reliable and high-performance solution for modern power conversion systems. References 17, tables 4, figures 19.