Short-Term Photovoltaic Power Generation Forecasting Based on Multivariable Grey Theory Model with Parameter Optimization

Table 3

Prediction performance of the optimization and ordinary model from April to June 2015.

	April		May		June
	Optimization model	Ordinary model	Optimization model	Ordinary model	Optimization model	Ordinary model
MRE (%)	7.71	23.41	12.53	16.07	12.89	35.84
ARE (%)	3.53	7.14	3.86	4.35	5.53	7.10
RMSE (kWh)	123.58	200.34	148.86	155.34	206.75	210.37