Optimization of Pumped Storage Plant (PSP) with Wind-Solar Hybrids - Sgurrenergy
Renewable energy sources like solar and wind power are crucial for sustainability, but their variable nature can lead to wasted energy and curtailment. Curtailment, which restricts power off-take, remains a persistent challenge for renewable developers. The intra-hour variability of solar and wind energy sources poses challenges for their seamless integration into the grid. Solar energy generation is influenced by factors such as cloud cover and shading, causing fluctuations in output within short time intervals. Similarly, wind energy generation is affected by wind-speed/direction variations, resulting in intermittent power supply.
Figure 1 illustrates the intra-hour variability of solar irradiation and wind speed for a certain day of the year. The high variability of these renewable sources can strain grid stability, necessitating advanced forecasting, grid management, and energy storage solutions. Accurate prediction of intra-hour variability enables better grid balancing and integration of solar and wind power, minimizing the need for backup generation and enhancing grid reliability. Effective management of this variability is crucial for maximizing renewable energy utilization and ensuring a smooth transition to a cleaner and more sustainable energy system.
The inter-annual variation in solar and wind generation refers to the year-to-year fluctuations in the amount of electricity generated from these renewable sources. This variability is influenced by factors such as weather patterns, seasonal changes, and climate variations.
Figure 2 illustrates the interannual variation of generation from solar and wind for typical plants. The impact of inter-annual variation on grid integration can be significant, as it requires careful management and planning to ensure a reliable and stable electricity supply. Utilities and grid operators need to account for these fluctuations and implement strategies such as diversified renewable portfolios, energy storage systems, and flexible grid management techniques to mitigate the effects of inter-annual variation and maintain grid stability.
To overcome this, energy storage systems are vital, with pumped hydro energy storage being a prominent solution. Pumped hydro storage allows excess renewable energy to be stored and used during periods of high demand. By mitigating curtailment and optimizing energy utilization, pumped hydro storage enhances grid performance and enables higher renewable penetration. Its role in addressing the variability of renewable generation contributes to a more sustainable energy system and fosters the transition to a low-carbon future.
Pumped hydro energy storage involves using excess energy to pump water to a higher elevation, creating potential energy. During times of high demand, this stored water is released, flowing downhill and driving turbines to generate electricity. This method offers several advantages, such as high efficiency, long lifespan, and large-scale storage capacity. Additionally, pumped hydro energy storage can help stabilize the grid by balancing fluctuations in renewable energy generation and demand, contributing to a more reliable and sustainable energy system.
