Novel High Efficiency Dual Stator Generator Design With Electrical-Thermal Flexible Output Based on Multi-Objective Optimisation

Abstract

The intermittent and variable nature of external wind speeds often causes traditional wind power systems to misalign with electricity demand resulting in significant wind energy waste and reduced utilisation efficiency. Additionally, the growing global population and economic development have increased demands for residential heating and industrial thermal energy. In order to improve the controllability of wind energy conversion and simultaneously meet the heat demand, this study proposes a novel dual-stator generator capable of electrical-thermal flexible output, which offers significant advantages in terms of adaptable electrothermal energy output and enhanced operational efficiency. Initially, the topology and magnetic circuit model of the generator are systematically established, with its parameters meticulously designed to accommodate the simultaneous generation of both electrical and thermal energy outputs. Subsequently, in order to meet the standards of the power grid, a comprehensive multi-objective optimisation methodology is implemented to enhance the operational performance of the generator, achieving remarkable improvements: a 63.31% reduction in harmonic content, a 20.50% increase in heating capacity, a 44.35% reduction in torque pulsation, a 0.13% improvement in conversion efficiency, and a 13.60% enhancement in power density. Through the significant reduction of harmonic content and torque pulsation, the proposed design significantly enhances grid compatibility while minimising mechanical vibrations, thereby ensuring stable power generation even under highly fluctuating wind speed conditions. Finally, through extensive testing under various operational conditions, the generator demonstrates a remarkable 2:1 adjustable ratio of electrical-to-thermal output across variable wind speeds, achieving a peak efficiency of 97.41%.