多因素耦合的光伏水泵提水系统配置优化方法

为探究提水效率影响因素及系统配置对光伏水泵提水系统性能影响，该研究利用光伏水泵循环提水系统，探究不同辐照强度、阀门开度、提水高度下光伏组件利用效率、水泵运行效率、管路效率变化规律，并构建系统流量计算模型，根据该模型计算各个区间的提水量占比及不同提水高度下提水系统的参数，根据该系统整体效率和太阳能利用率确定最优提水高度；在此基础上，通过增加光伏组件面积及蓄水池数量降低提水系统提水成本及提高太阳能利用率，并确定提水成本最低时光伏组件面积和蓄水池数量。研究结果表明：确定光伏组件利用效率随辐照强度变化关系及水泵高效率运行区间，并确定光伏水泵最优提水高度为20 m，太阳能利用率为64.05%，整体利用效率为4.521%，提水成本为0.151元/m³；在最优提水高度的基础上，讨论了增加光伏板面积及蓄水池数量对太阳能利用率与提水成本的影响，当提水成本最低时，光伏板面积为3.71 m²，成本为0.143元/m3，太阳能利用率为90.83%；蓄水池数量为4个，成本为0.145元/m³，太阳能利用率为94.62%，表明增加光伏板面积和蓄水池...

Optimizing water extraction of photovoltaic pump using multi-factor coupling

This study aims to explore the influence of water extraction and system configuration on the performance of photovoltaic pumps. The water extraction system was required for the high efficiency, high utilization rate of solar energy, and cost saving in the photovoltaic pump. The circulating water extraction was also selected to improve the conversion efficiency of the photovoltaic module, the pump operation efficiency, and pipeline efficiency under different irradiation intensities, valve opening, and water extraction height. The flow model was then constructed. The irradiation intensity data that was monitored in 2022 was partitioned to calculate the proportion of radiation intensity in each partition using the flow model. The amount of water extraction was calculated to evaluate the parameters of the system in each range of radiation intensity under different heights. The optimal height of water extraction was then determined, according to the overall efficiency of the water extraction system and the utilization rate of solar energy. There was an increase in the area of photovoltaic modules and the number of reservoirs. The utilization rate of solar energy was improved in the water-lifting system, where the cost was reduced significantly. The optimal area of photovoltaic modules and the number of reservoirs were obtained at the lowest cost of the water-lifting system. The results show that there was a significant relationship between the utilization efficiency of photovoltaic modules and the irradiation intensity. Some variations were also found in the pump operation efficiency with the irradiation intensity and valve opening, in order to determine the high-efficient operation interval of the photovoltaic pump and the valve opening. At the same time, the optimal height of water lifting was determined as 20 m in the photovoltaic pump, according to the utilization rate of solar energy and the overall efficiency. Meanwhile, the utilization rate of solar energy was 65.05 %, the overall utilization efficiency was 4.521%, and the water lifting cost was 0.151 yuan/m3. The optimal height of water lifting was utilized to clarify the influence of the increasing area of photovoltaic panels and the number of reservoirs on the utilization rate of solar energy and water lifting cost. Once the water lifting cost was the lowest, the area of photovoltaic panels, water lifting cost, and solar energy utilization rate were 3.71 m2, 0.151 yuan/m3 and 90.83%, respectively. When the number of reservoirs was 4, the water lifting cost and solar energy utilization rate were 0.145 yuan/m3 and 94.62%, respectively. Therefore, the increasing area of photovoltaic panels and the number of reservoirs greatly contributed to the cost saving of water lifting and the solar energy utilization rate. There was the application range and complementary relationship between valve opening and opening/closing under different irradiation intensities. Two application scenarios were introduced to improve the solar energy utilization rate. The finding can provide new ideas to optimize and apply the photovoltaic water pumping.