高原高寒地区局部阴影下光伏阵列输出功率提升实验研究

Experimental Research on Photovoltaic Arrays Output Power Enhancement Experiment Under Partial Shading in Frigid Plateau Region

高原高寒地区太阳能资源充足,利用光伏发电技术有利于改善当地电源结构。光伏电站出力不足是业内普遍存在的技术难题,光伏组件老化、表面温度高、局部阴影等都会降低光伏电站出力。以4×2光伏阵列为例,通过Matlab/Simulink建模仿真,对不同结构的光伏阵列在局部阴影下的输出特性进行对比,分析表明重构网状(RTCT)结构优于其他3种结构,且最大输出功率平均提升7.7%,为光伏阵列输出功率提升奠定实验基础。基于拉萨搭建的光伏阵列输出功率提升实验平台,采用改变光伏阵列拓扑结构和增加直流优化器2种方法,研发光伏阵列输出功率提升技术。结果表明,采用以上2种方法均能有效提升光伏阵列输出功率,可为光伏电站优化设计和运行提供解决方案。

By taking advantage of the photovoltaic(PV)power generation technology,the abundant solar energy resource in frigid plateau region can greatly improve the local energy infrastructure.However,the low efficiency of PV power plant has been existing as a widely publicized technical barrier.Specifically,the aging of PV modules,high surface temperature or partial shading may severely undermine the output of PV power plant.In this paper,take the example of the 4×2 PV arrays,based on the modeling and simulation with Matlab/Simulink software,the output characteristics of PV arrays are compared with respect to different structures under partial shading conditions.The results show that the RTCT structure outperforms all three others,with its maximum output power of PV array increased by 7.7%on average,such that the foundation for experiments is then formulated on enhancing PV arrays output power.Base on the experimental platform of PV arrays output power enhancement built in Lasa,the PV arrays output power enhancement technology is developed in terms of two methods,i.e.,changing the topological structure of PV arrays and adding DC optimizers.The results show that both methods can increase PV arrays output power,which can provide solutions for optimization design and operation of PV power plant.