Forecasting of Energy Production for Photovoltaic Systems Based on ARIMA and ANN Advanced Models

Table 11

PV park—comparison between measured and forecasted energy using PR of the PV system.

Date	PR (performance ratio) (%)	Measured exported energy (MWh)	Forecasted energy (MWh)	Percentage difference between measured and forecasted values (%)
04 July 2013	81.58	57.47	67.45	17%
04 July 2014	84.98	49.47	66.96	35%
08 July 2013	84.2	57.36	52.79	8%
08 July 2014	84.04	56.83	61.64	8%
14 July 2013	85.72	63.15	67.73	7%
14 July 2014	88.31	30.89	76.71	148%
29 July 2013	80.05	58.11	56.36	3%
29 July 2014	67.02	36.28	44.03	21%
30 July 2013	83.36	49.33	59.87	21%
30 July 2014	83.42	59.75	56.61	5%
31 July 2013	86.31	38.5	62.22	62%
31 July 2014	85.81	35.66	52.35	47%