农田灌溉光伏水泵系统性能测试分析

Performance test and analysis of a photovoltaic pumping system for farmland irrigation

【目的】探究农田灌溉光伏水泵系统综合用能需求特性,提高该系统性能可靠性和实用性。【方法】基于高效水泵和研发的逆变器,构建了农田灌溉光伏水泵系统,结合系统装置构成与运行特点,对不同扬程运行工况下的电性能参数和扬水效率特性及水泵流量与功率特性等进行测试分析。【结果】在一定太阳辐射强度范围内,调速运行的水泵流量与输出频率有较好一致性;稳定运行时段的水泵流量可达到2 m^(3)·h^(-1);定扬程24.8 m下,系统最大扬水效率达12.7%,日平均扬水效率11.6%,日扬水量13.1 m^(3);当扬程降低到14.0 m时,最大扬水效率和日平均效率分别比前者低3.2%和3.6%,表明减低扬程并不一定能提高系统扬水效率,但对输出流量有影响。【结论】该农田灌溉光伏水泵系统配置稳态和动态性能良好,扬水能力可满足省水微灌和植被绿化等基本农业生产需要。

【Objective】This study was conducted to explore the comprehensive energy demand characteristics of photovoltaic water pump systems for farmland irrigation,and improve the reliability and practicality of the system’s performance.【Method】Based on high efficient water pump and inverter developed,a photovoltaic power generation water pumping system was built.Combined with the devices composition and operation characteristics of the system,the electrical performance parameters,water lifting efficiency,flow and power generation characteristics were tested and analyzed under different head operating conditions.【Results】There was good consistency between the flow and output frequency of the water pump controlled by variable frequency speed regulation within a certain solar radiation intensity range.The pump flow could reach 2 m^(3)·h^(-1)during stable operation.At a pump head of 24.8 m,the maximum pumping efficiency was 12.7%,and the daily average pumping efficiency was 11.6%,and daily pumping volume was 13.1 m^(3).When the pump head was cut down to 14.0 m,the maximum pumping efficiency and daily average efficiency were 3.2%and 3.6%lower than the former,respectively.This indicates that reducing the pump head may not necessarily improve the system’s lifting efficiency,but may affect the output flow.【Conclusion】The system configuration has a good steady-state and dynamic performance,which can meet basic agricultural production needs such as water-saving micro-irrigation and vegetation greening.