Comparative performance analysis of backstepping and sliding mode control for static synchronous compensators based on flying capacitor multicell converters

• Дата: 2026
• Автори: Belakehal, S., Srief, M. L.
• Формат: Стаття
• Мова: Англійська
• Опубліковано: National Technical University "Kharkiv Polytechnic Institute" and Аnatolii Pidhornyi Institute of Power Machines and Systems of NAS of Ukraine 2026
• Теми: flying capacitor multicell converter; static synchronous compensator; sliding mode control; PI controller
• Онлайн доступ: https://eie.khpi.edu.ua/article/view/342352
• Назва журналу: Electrical Engineering & Electromechanics

Introduction. The integration of a static synchronous compensator (STATCOM) based on a flying capacitor multicell converter (FCMC) provides an effective solution for dynamic reactive power compensation and voltage quality improvement. The adoption of nonlinear control strategies, such as sliding mode control (SMC) and backstepping (BSC), enhances system robustness and ensures precise tracking of variables despite network nonlinearities and disturbances. Problem. Reactive, inductive or capacitive loads cause network imbalances leading to voltage sags, swells and fluctuations at the point of common coupling (PCC). These disturbances degrade power quality, reduce the power factor and place excessive stress on equipment. Moreover, high reactive power flow increases losses and decreases the overall system efficiency. Goal. This study compares the performance of SMC and BSC controllers applied to a STATCOM for PCC voltage regulation aiming to improve the power factor, effectively control reactive power and overcome the limitations of conventional controllers under network nonlinearities and voltage disturbances caused by reactive loads. Methodology. The SMC uses a sliding surface based on current errors to achieve fast and precise tracking even in the presence of disturbances. The BSC control employs Lyapunov functions to decompose the nonlinear system into controllable subsystems, ensuring overall stability. Both strategies are simulated on a 5-level flying capacitor multicell STATCOM using MATLAB/Simulink. Simulation results confirm the effectiveness of both controllers in maintaining the PCC voltage at its reference value with a very short response time (1 ms), even under reactive load variations. Precise reactive power control enables rapid compensation of fluctuations, improves the power factor and reduces harmonic distortion. The scientific novelty of this work lies in the comparative performance analysis of the nonlinear SMC and BSC controllers applied to a STATCOM based on a FCMC converter, considering network disturbances caused by reactive loads. Practical value. These nonlinear control strategies significantly enhance the stability, voltage quality, and power factor of low-voltage networks equipped with STATCOMs. References 36, tables 4, figures 18.