双面光伏高效发电的支架结构及控制

Research on tracker structure and control of bifacial photovoltaic system with high-efficiency power generation

当前光伏系统发电效率偏低,支架控制可有效提高发电效率,但当前支架控制复杂.设计了一种配置反射器结构的双面光伏单轴跟踪支架系统,充分发掘双面光伏背面发电潜力.基于改进后的结构提出一种支架优化控制策略,能根据不同日期和天气灵活地对单轴跟踪支架转动频次进行优化,可保证系统总发电量最大化的同时降低支架频繁启停造成的耗电量,最大化地提高系统收益.计算结果表明：与固定倾角式双面电池相比,改进支架结构后,系统夏、冬两季日发电量分别提高了53.1%、39.8%,系统收益能力得到有效提升,弥补了前期投资成本较高的缺点,对双面光伏的广泛应用具有一定的参考价值.

At present the power generation efficiency of bifacial photovoltaic（PV）system is low;the control of PV system＇s tracker can improve the power generation efficiency but complex.In order to make full use of the front and back of modules to generate electricity,a simple tilted single axis solar tracker with reflector is designed.Considering the date and the weather,an optimization control strategy of tracker based on the new structure is proposed to optimize rotation times of tracker.The strategy can guarantee the maximum output of PV system and reduce the power consumption caused by the frequently up-down of tracker;and the system＇s income can be maximized.The simulation results show that：compared with the stationary bifacial modules which has title angle,the output of bifacial photovoltaic modules can get more than 53.1% promotion in summer and 39.8% promotion in winter when it is applied in the tilted single axis solar tracker with reflector.And the new tracker enables system profitability to be effectively improved,which makes up for the disadvantage of high upfront investment cost;it has certain reference value for the wide application of bifacial PV.