Participation of Renewable Energy Hubs Including Hydrogen, Thermal and Compressed Air Storages in the Energy Market based on Energy Management System
Subject Areas : Renewable energy
1 - Faculty of Engineering and Flight- Imam Ali University, Tehran, Iran
Keywords: compressed-air, energy hub, storage, thermal storage,
Abstract :
This paper concerns the participation of renewable energy hubs equipped with wind farms, bio-waste units, and hydrogen, thermal, and compressed air storage systems in the energy market based on the market clearing price model. Hubs are simultaneously present in both electrical and thermal networks. The bio-waste unit is equipped with combined heat and power technology, so it produces electrical and thermal energy. The proposed design is in the form of bi-level optimization. Its upper level formulates the maximization of the hub's expected profit considering the operational constraints of the mentioned resources and storage devices. The market clearing price strategy is included at the lower formulation level, considering minimizing the expected operation cost of electricity and thermal power generation units subject to the optimal power flow equations of electrical and thermal networks. The Karush-Kuhn-Tucker method obtains a single-level formulation for the design. The stochastic optimization is used to model uncertainties of load and renewable resources. Finally, the obtained numerical results indicate the proposed design's ability to improve the operation and economic status of energy networks compared with optimal power flow studies (the hub-less network), along with optimal power scheduling of hubs in accordance with improving their economic status. So, hydrogen, compressed air, and heat storage devices lead to an 11.2% enhancement in the economic status of the renewable hub. Optimal energy management of renewable hubs based on the storage system has led to a 27% enhancement in energy network operation status compared to optimal power flow studies.
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