Design of hybrid power-to-power systems for continuous clean PV-based energy supply
Autor: | Giulio Guandalini, Elena Crespi, Paolo Colbertaldo, Stefano Campanari |
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Rok vydání: | 2021 |
Předmět: |
Energy storage
Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 01 natural sciences Electric power system Energy supply Process engineering Cost of electricity by source Renewable Energy Sustainability and the Environment business.industry Photovoltaic system Hybrid storage system 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Renewable energy Fuel Technology Solar PV Power-to-Power Environmental science Electricity Hybrid power 0210 nano-technology business Hydrogen |
Zdroj: | International Journal of Hydrogen Energy. 46:13691-13708 |
ISSN: | 0360-3199 |
DOI: | 10.1016/j.ijhydene.2020.09.152 |
Popis: | The increasing penetration of intermittent renewable sources, fostering power sector decarbonization, calls for the adoption of energy storage systems as an essential mean to improve local electricity exploitation, reducing the impact of distributed power generation on the electric grid. This work compares the use of hydrogen-based Power-to-Power systems, battery systems and hybrid hydrogen-battery systems to supply a constant 1 MWel load with electricity locally generated by a photovoltaic plant. A techno-economic optimization model is set up that optimizes the size and annual operation of the system components (photovoltaic field, electrolyzer, hydrogen storage tanks, fuel cell and batteries) with the objective of minimizing the annual average cost of electricity, while guaranteeing an imposed share of local renewable self-generation. Results show that, with the present values of investment costs and grid electricity prices, the installation of an energy storage system is not economically attractive by itself, whereas the installation of PV panels is beneficial in terms of costs, so that the baseline optimal solution consists of a 4.2 MWp solar field capable to self-generate 33% of the load annually. For imposed shares of self-generation above 40%, decoupling generation and consumption becomes necessary. The use of batteries is slightly less expensive than the use of hydrogen storage systems up to a 92% self-generation rate. Above this threshold, seasonal storage becomes predominant and hybrid storage becomes cheaper than batteries. The sale of excess electricity is always important to support the plant economics, and a sale price reduction sensibly impacts the results. Hydrogen storage becomes more competitive when the need for medium and long terms energy shift increases, e.g. in case of having a cap on the available PV capacity. |
Databáze: | OpenAIRE |
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