长治地区某5kW_(p)并网光伏发电系统的性能及故障原因分析

ANALYSIS OF PERFORMANCE AND FAULT CAUSES OF A_(5)kWP GRID-CONNECTED PV POWER GENERATION SYSTEM IN CHANGZHI AREA

本文利用PVsyst软件并结合Meteonorm 7.1气象数据库提供的气象数据对位于长治地区的某5 kWp并网光伏发电系统在2019年的运行情况进行了统计分析。结果显示:6-9月,PVsyst软件模拟得到的光伏发电系统发电量与实际发电量的差别较大,模拟得到的月均发电量平均值比实际的月均发电量平均值高43.0%;而利用当地每日实测的太阳辐射数据,经过换算后再输入PVsyst软件进行模拟,得到的月均发电量和能效比(PR)值(67.1%)均与实际的月均发电量和PR值(56.5%)较为接近,因此,利用PVsyst软件进行光伏发电系统性能模拟时,根据逆变器工作时段动态调整太阳辐射量的计算,并将换算后的太阳辐射量输入软件能实现更精确的模拟。针对估算得到的该光伏发电系统归一化日发电量与世界其他地区的数值相比处于较低水平的情况,通过分析后发现是光伏发电系统故障导致了其发电量偏低。因此,在光伏发电系统投入运行前,应成立专业化的第三方工程验收团队对光伏发电系统进行全面检查和验收,为系统的正常运行提供必要保障。

This paper uses PVsyst software and combined with meteorological data provided by Meteonorm 7.1 meteorological database to conduct a statistical analysis of the operation of a 5 kWp grid-connected PV power generation system in Changzhi area in 2019.The results show that from June to September,power generation capacity of PV power generation system simulated by PVsyst software differs greatly from the actual power generation capacity,and the average value of monthly average power generation capacity simulated is 43.0%higher than actual average value of monthly average power generation capacity.And using the local daily measured solar radiation data,after conversion,and then input into PVsyst software for simulation,the simulated monthly average power generation capacity and PR value(67.1%)are close to the actual monthly average power generation capacity and PR value(56.5%).Therefore,when the PVsyst software is used to simulate the performance of the PV power generation system,according to the working period of the inverter to dynamically adjust calculation of the solar radiation,and input the converted solar radiation into the software,which can achieve a more accurate simulation.In view of the estimated normalized daily power generation capacity of the PV power generation system is at a low level compared with the value in other parts of the world,through analysis,it is found that the PV power generation system failure has caused its low power generation capacity.Therefore,before the PV power generation system is put into operation,a professional third-party engineering acceptance team must be established to conduct a comprehensive inspection and acceptance of the PV power generation system to provide the necessary guarantee for the normal operation of the system.