Abstract
To expand the use of wind energy, this paper proposed an off-grid ice storage system driven by distributed wind energy using ice storage to partly replace batteries with wind-electric-cold conversion. The current research aimed to achieve stable and efficient conversion of wind-electric-cold through control method. A system energy transfer model was established to study the energy utilizing efficiencies between the variable speed compressor direct drive mode and the battery floating charge mode under different wind conditions. An optimized variable step-size duty cycle maximum power point tracking (MPPT) algorithm based on the system impedance variation was proposed, then the average wind-electric conversion efficiency increased from 31.6% to 40.58%. Mode-switching control based on the parameters of the wind condition definition was designed to improve electric-cold conversion efficiency to 205.8% on the premise of reducing the battery charge and discharge loss by switching the battery on or off in advance. The superiority of the control method was verified by experiments, finally, the system energy efficiency ratio (EER) reached 0.59 in the case of continuous and stable operation under outdoor wind conditions.
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