家用并网光伏系统仿真与运行性能计算

Simulation and calculation of the operation performance of adomestic grid-connected photovoltaic system

设计了一个家用并网光伏系统并计算其年发电量以研究其运行性能。在设定指定地点地理位置并导入气象数据,并根据屋顶可用面积决定光伏阵列的排布和逆变器参数后,利用PVsyst软件对光伏系统进行模拟,并计算发电量。结果表明:所设计的光伏系统年发电量约为7114 kW·h,发电效率为75.1%。结合调查数据发现,该光伏系统发电量超过了当地用户年平均用电量;光伏系统一年中日输出电量的变化趋势显示,光伏系统发电量高峰时的日发电量均值可达35 kW·h以上;而光伏系统发电量低谷时的日发电量均值不足20 kW·h;光伏系统各项损失在理论发电量中的占比变化趋势显示,每年6、7、8月系统的光伏阵列损失最大,其原因是夏季气温升高使得光伏阵列运行性能受到影响。该光伏系统发电量可以满足一般家庭的用电需求,且用户可以参考光伏系统发电量的变化趋势选择合理的用电方式。

A household grid-connected photovoltaic(PV)system was designed,and its annual power generation was calculated to evaluate its operation performance.Initially,the parameters of PV arrays and inverters were selected by the available area on the roof.And then the software PVsyst was used to simulate and calculate the power generation of the designed system at setting location with the associated meteorological data.The results indicated that the annual power generation of this system was 7114 kW·h,and the operation efficiency was 75%.Combining with the survey data,the power generation of this system exceeded the average annual power consumption of the households in local area.The daily power output of the PV system indicated that average daily power generation of the system maximized at 35 kW·h,while average daily power generation could minimize at 20 kW·h.The fraction of available power generation of this system indicated that the greatest power loss of PV arrays was achieved in June,July,and August due to the influence of high temperature in summer on their performance.In a word,the designed system could meet the demand of electricity consumption in a normal household,and the users could choose the power supply according to the power generation of the PV system.