In the quest to stabilize the grid amidst the global shift towards renewable energy, a pioneering study led by Isabel Catarino from the LIBPhys-UNL, Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, has introduced a compelling solution. The research, published in the journal Energies, explores the integration of variable renewable energy sources (vRES) like wind and solar power with run-of-river (ROR) hydropower plants, creating a hybrid system that promises to enhance grid stability and reduce reliance on conventional balancing power.
The study focuses on the northern region of Portugal, a landscape rich in both wind and solar potential, as well as ROR hydropower capabilities. Catarina and her team developed a conceptual model of a 100 MW virtual hybrid power plant, leveraging actual consumption data and conceptual production data to demonstrate the feasibility of this approach. The key innovation lies in the use of ROR hydropower plants, which can modulate their generation to compensate for the variability of wind and solar power, without compromising their standard operational capabilities.
“Our findings indicate that ROR plants can effectively complement the fluctuations of wind and solar power, providing a stable and reliable energy supply,” Catarina explained. “This synergistic approach not only reduces the strain on local grids but also lessens the reliance on balancing power, making it a promising strategy for high-penetration renewable energy systems.”
The study revealed that the hybrid system could maintain a net-zero balance between production and consumption on a daily basis, even in scenarios with limited water availability. However, seasonal variations posed challenges, particularly during the summer when wind and hydro resources were less available. To overcome these deficits, the researchers suggested potential solutions such as installing dedicated batteries, increasing PV capacity, or implementing demand-side management strategies.
The commercial implications of this research are significant. As the energy sector continues to transition towards renewable sources, the need for stable and predictable power supply becomes paramount. The integration of ROR hydropower with wind and solar power offers a cost-effective and environmentally friendly solution, reducing the need for additional energy storage units and minimizing capital expenditure.
“This approach holds the potential for creating sustainable and balanced renewable energy systems,” Catarina noted. “By combining wind, solar PV, and ROR hydro for daily energy arbitrage, we can achieve a near 100% renewable power system, paving the way for a more sustainable energy future.”
The study, published in Energies, underscores the potential of hybrid renewable energy systems to revolutionize the energy sector. As the world continues to decarbonize and transition towards clean energy technologies, the integration of ROR hydropower with wind and solar power presents a viable and scalable solution. This research not only contributes to the ongoing energy transition but also sets the stage for future developments in renewable energy integration and grid stability.
