基于PVPT控制的小型光伏微电网混合控制研究

Research on hybrid control method of the small-scale photovoltaic microgrid based on PVPT control

针对小型光伏微电网系统由于受投资成本限制造成的经济性差、能源利用手段单一以及监控系统功能不完整的问题,设计了一种基于光电光热一体化(Photovoltaic-photothermal, PVPT或PV/T)技术的简单改进方案。并在此基础上探讨了基于前端组件温度-功率关系的混合控制方法的可行性。利用PVPT原理的优点综合提升小型光伏微电网系统的整体经济效益。实验结果表明,改进方案能有效地增加系统的发电效率,丰富用户的光能利用手段。而以此改进方案为基础的混合温度功率控制方法调控过程平滑,调控区间较小,可作为小型光伏微电网系统的后备控制和功率微调控制。由于该改进方法成本较低、结构简单,满足小型光伏微电网系统运营特点的要求,具有一定的应用潜力。

In view of the poor economic efficiency,single energy utilization method,and incomplete monitoring system function of small-scaled photovoltaic micro-grid system due to the restriction of investment cost,a simple improvement scheme is designed on the basis of photovoltaic-photothermal integration(photovoltaic-photothermal,PVPT or PV/T)technology,and the feasibility of hybrid control method based on the temperature-power relation of front-end components is discussed on this basis.The overall economic benefits of small-scale photovoltaic micro-grid system can be comprehensively improved through utilizing the strengths of PVPT principle.The experimental result shows that the improvement scheme can validly increase the power generation efficiency of the system,as well as enrich the luminous energy utilization methods of the users.The mixed temperature power control method based on such improvement scheme demonstrates a smooth regulation process and smaller regulation interval,and can be used for the backup control and fine control of small-scaled photovoltaic micro-grid system.Since such improvement method is low in cost and simple in structure,it meets the operation characteristic requirements of small-scaled photovoltaic micro-grid system,and possesses certain application potential.