A novel tracking method for a high efficiency of PV generation considering shaded conditions

This paper is proposed a novel control strategy of a PV tracking system considering the shadow effects. If distance between arrays at PV system is not enough, PV arrays have shadow. The cell of this array is operated as reverse bias. The operating reverse bias of cell causes hot-spot and loss. Therefore, to reduce loss by shadow effects, this paper is proposed shadow compensation algorithm using distance between arrays and length of array shadow. The distance between arrays is calculated by using azimuth of solar and length of array shadow is calculated using by altitude of solar. The shadow compensation algorithm proposed in this paper compares distance between arrays and length of array shadow. When the shadow length is longer than the distance between arrays, the algorithm adjusts altitude of array to avoid the shadow effects. The control algorithm proposed in this paper proves validity through compared with conventional algorithm and proposes experiment result.