PVLIB:生成辐照度值正在创建nan

Question

我正在尝试使用PVLIB Python在垂直平面上生成辐照度数据，在水平平面上输入从PVGIS网站收集的数据。下载的文件是.csv格式。包含每小时频率的辐照度值

mydateparser = lambda x: pd.datetime.strptime(x, "%Y%m%d:%H%M") #creating a lambda function to parse the date in csv file

irrad_horz_ERA5=pd.read_csv(r'C:\Users\dpaul\OneDrive\1st part\Downloaded csv\PVGISERA5\Horizontal\Timeseries_45.467_9.191_E5__0deg_0deg_2010_2016.csv',  parse_dates=['Date'], date_parser=mydateparser)

latitude = 45.466; longitude = 9.183; altitude = 120; city = 'Milano'; timezone = 'Europe/Rome'; ground_albedo = 0.2 

times = pd.date_range('2010-1-1 00:00:00', periods=52584, freq='1 h', tz=timezone) #2010 to 2015


solpos = pvlib.solarposition.get_solarposition(times, location.latitude, location.longitude) # solar position
columns=['apparent_zenith', 'azimuth']
solpos[columns] = solpos[columns].apply(pd.to_numeric, axis=1)

cols = ['ghi', 'Bi', 'Di']
irrad_horz_ERA5[cols] = irrad_horz_ERA5[cols].apply(pd.to_numeric, axis=1)

westERA5=pvlib.irradiance.get_total_irradiance(surface_tilt=90, surface_azimuth=270, solar_zenith=solpos.apparent_zenith, solar_azimuth=solpos.azimuth, ghi=irrad_horz_ERA5.ghi, dni=irrad_horz_ERA5.Bi, dhi=irrad_horz_ERA5.Di, albedo=ground_albedo)

westERA5.head(20)

这将生成连续的NaN值，如附件中所示。我不确定我使用的pvlib函数是不是不正确或是其他什么

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