应用于高原山地光伏电站的平单轴光伏发电跟踪系统的优化

OPTIMIZATION OF HORIZONTAL SINGLE-AXIS PV POWER GENERATION TRACKING SYSTEM APPLIED TO PLATEAU MOUNTAIN PV POWER STATIONS

对应用于高原山地光伏电站的平单轴光伏发电跟踪系统进行了优化研究。高原山地光伏电站因采用平单轴光伏发电跟踪系统时,清晨和傍晚太阳高度角较低时前、后排光伏组串会相互产生阴影遮挡,由此现象入手,从反阴影遮挡跟踪策略、平单轴光伏发电跟踪系统对其基础的破坏、平单轴光伏发电跟踪系统可靠性等方面分析了目前采用的常规平单轴光伏发电跟踪系统由于跟踪角度产生的阴影遮挡弊端;然后对常规反阴影遮挡跟踪策略进行了优化,获得了前、后排光伏组串不产生阴影遮挡情况下平单轴光伏发电跟踪系统在的最佳跟踪角度;设计了坡地反阴影遮挡跟踪策略,加入了地形坡度角的校正,防止过度跟踪导致平单轴光伏发电跟踪系统过载及其基础被损坏;最后以我国西部地区某高原山地光伏电站为例,对优化后的平单轴光伏发电跟踪系统进行了验证,证实了本优化方法有助于提升平单轴光伏发电跟踪系统在后续长期运行过程中的可靠性,并为其再次优化提供了技术支撑。

In this paper,the optimization of horizontal single-axis PV power generation tracking system for plateau mountain PV power stations is studied.Starting from the phenomenon that the plateau mountain PV power station adopts the horizontal single-axis PV power generation tracking system,which causes shadows occlusion each other between the front and back PV strings when the sun altitude angle is low in the morning and evening,the disadvantages of shadow occlusion caused by the tracking angle of the conventional horizontal single-axis PV power generation tracking system are analyzed from the aspects of anti shadow occlusion tracking strategy,damage of horizontal single-axis PV power generation tracking system to its foundation,horizontal single-axis PV power generation tracking system reliability.Then,the conventional anti shadow occlusion tracking strategy is optimized,and the optimal tracking angle of the horizontal single-axis PV power generation tracking system under the condition that the front and rear PV strings do not produce shadows is obtained.The slope anti shadow occlusion tracking strategy is designed,and the correction of terrain slope is added to prevent the overload of horizontal single-axis PV power generation tracking system and the damage of its foundation caused by excessive tracking.Finally,taking a plateau mountain PV power station in Western China as an example,the optimized horizontal single-axis PV power generation tracking system is verified,which proves that this optimization method is helpful to improve the reliability of the horizontal single axis PV power generation tracking system and provides technical support for its reoptimization in the subsequent long-term operation.