Comparative analysis of advanced modular triple H-bridge topologies for open-end winding induction motor in wind-driven pumping systems

Introduction. The integration of renewable energy into irrigation requires robust power conversion to handle the intermittent nature of wind. Open-end winding induction motors (OEW-IMs) offer a flexible alternative to standard star-connected drives. Problem. Conventional pumping drives suffer from limited fault tolerance and high harmonic distortion, which can lead to system downtime in remote areas. Goal. This paper evaluates 2 novel modular configurations: a triple H-bridge drive with OEW-IM supplied by 3 isolated direct current buses at each entry (case A) and a fully decentralized structure where each inverter leg is supplied by an independent wind turbine, totaling 6 sources (case B), to determine their impact on power quality and service continuity. Methodology. The study utilizes a mathematical model of an OEW-IM where each phase is independently controlled. For case A, power segmentation is achieved at the phase level, while case B employs a higher degree of segmentation with 6 separate DC sources. Comparative simulations are performed to assess total harmonic distortion and torque ripple. Results. Case A demonstrates a significant multi-level voltage effect and increased voltage capacity through independent winding supply. Case B provides the highest degree of reliability, maintaining stable operation even under multiple turbine failures due to its extreme power segmentation. Scientific novelty. The research introduces a fully decentralized power structure combining OEW-IMs with a one-to-one ratio of turbine-to-inverter-leg, representing a new level of modularity for off-grid water pumping systems. Practical value. The proposed architectures offer a technical solution for high-power remote irrigation where maintenance is difficult and reliability is paramount. References 15, table 1, figures 15.