Comparison of Hybrid Models for PV Power Output Forecasting — Application to Oryahovo, Bulgaria

The paper presents a comparison of different hybrid models used for PV power output forecasting. The models are hybrid, because they use combination of solar radiation forecasting model and power output estimation model. The prediction precision is studied on two time periods – three and six days with different type of solar radiation. The relative root mean square error is used for estimation of the precision. The investigated models show good correlation to the real PV power and can be applied in the exploitation of a PV plant according to the available data.