Two energy system analysis models: A comparison of methodologies and results

This paper presents a comparative study oftwo energy system analysis models both designed for the purpose ofanalysing electricity systems with a substantial share offluctuating renewable energy. The first model (EnergyPLAN) has been designed for national and regional analyses. It has been used in the design ofstrategies for integration ofwind power and other fluctuating renewable energy sources into the future energy supply. The model has been used for investigating new operation strategies and investments in flexibility in order to utilize wind power and avoid excess production. The other model (H2RES) has been designed for simulating the integration of renewable sources and hydrogen into island energy systems. The H2RES model can use wind, solar and hydro as renewable energy sources and diesel blocks as backup. The latest version ofthe H2RES model has an integrated grid connection with the mainland. The H2RES model was tested on the power system ofPorto Santo Island, Madeira, Portugal, Corvo and Graciosa Islands, Azores Islands, Portugal and Sal Island, Cape Verde. This paper presents the results of using the two different models on the same case, the island of Mljet, Croatia. The paper compares methodologies and results with the purpose ofidentif ying mutual benefits and improvements of both models.