Estimating Solar Insolation and Power Generation of Photovoltaic Systems Using Previous Day Weather Data

Table 5

Accuracies of predicted value ranges according to the input variables, NHN, and NHL.

Input variables	Number of hidden layers	RMSE (kWh/m^2/day)	MBE (kWh/m^2/day)	MAE (kWh/m^2/day)	NSE
Thigh, Tlow, RH, DWS, PR, PD, SD, CSD, CC	1	1.764–2.000	−0.891 to −0.787	1.368–1.529	−0.503 to −0.169
	2	1.763–2.023	−0.811 to −0.649	1.355–1.552	−0.920 to −0.210
	3	1.760–2.015	−0.840 to −0.568	1.373–1.506	−1.092 to −0.164
	4	1.799–2.015	−0.903 to −0.711	1.382–1.559	−0.937 to −0.216
	5	1.793–2.102	−0.853 to −0.589	1.366–1.631	−1.068 to −0.207
Thigh, Tlow, RH, DWS, SD, CSD, CC	1	1.975–2.227	−1.301 to −0.969	1.515–1.692	−0.292 to −0.016
	2	1.975–2.138	−1.076 to −0.714	1.550–1.635	−0.162 to −0.016
	3	1.792–2.318	−1.221 to −0.567	1.432–1.773	−0.391 to 0.164
	4	1.889–2.187	−1.005 to −0.547	1.436–1.632	−0.245 to 0.071
	5	1.807–2.338	−1.227 to −0.419	1.444–1.773	−0.423 to 0.150
Thigh, Tlow, RH, DWS, SD, CSD	1	1.425–1.506	−0.272 to −0.129	1.157–1.204	0.411–0.473
	2	1.423–1.597	−0.400 to −0.090	1.131–1.297	0.337–0.474
	3	1.421–1.660	−0.376 to −0.114	1.131–1.342	0.284–0.482
	4	1.444–1.692	−0.464 to −0.121	1.148–1.372	0.256–0.458
	5	1.450–1.720	−0.291 to −0.118	1.153–1.405	−0.338 to 0.454

The NHN for each layer was conducted by changing both to 10–20.a