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Cash flow of the two projects. Blue represents a more active strategy, ignoring degradation but gaining more income. Orange adopts a more conservative strategy to reduce degradation.

The fact that lithium-ion batteries experience degradation over time is not necessarily a limiting factor for their widespread use in fixed storage systems, but requires long-term management strategies.

Various types of lithium-ion batteries constitute the vast majority of advanced energy storage systems, which are connected to power grids around the world today. At the same time, people have gradually realized that using these advanced batteries to obtain the maximum environmental and economic benefits for the power grid and distributed energy system is at the cost of maintaining the battery itself to provide the longest life or the most effective use.

In the latest issue of PVTechPower (Vol. 16), this is "Is the battery cycle worth it?" The subject of. Maximizing the life cycle value of energy storage through advanced control ", a special article written by Dr. Andres Cortes and Ben Kaun of the Electric Power Research Institute (EPRI), a non-profit research group, provides consulting services for groups in the public utilities sector and other sectors, and uses electricity.

This article first appeared in PVTechPower's Energy Storage Although you can download the "storage and intelligent power" part planned by news as a part of the technical journal, we have also uploaded it as a blog. ESN website, here.

"Battery storage degradation is usually manifested in the loss of energy retention capacity, the reduction of power transmission capacity and efficiency, and the eventual need to replace the battery," the two wrote.

"Depending on the state of the battery system, replacement may only mean replacing a few modules or replacing them completely."

There are many factors affecting the deterioration of lithium battery, including the average state of charge of battery life and the depth of charge discharge cycle. According to the grid (front end of instrument) or post instrument services provided by the deployment of fixed batteries, multiple applications or services are usually stacked from one system, and the battery life of the battery system will change due to wear, as discussed in detail by EPRI authors.

However, as the author also points out, the economy of battery system can be weighed against the consideration of degradation and its long-term impact. In other words, if a project owner's income exceeds enough to cover the cost of increasing and replacing cells over time, then a decision can be made to allow degradation to occur, taking into account the economic and technical modeling of the project from their design. On stage. EPRI has created StorageVET (Storage Value Assessment Tool) to assess such opportunities and their accompanying costs.

Steve Fludder, CEO of technology provider and system integrator NECEnergySolutions (NECES), recently mentioned the concept of this trade-off in an interview with Energy-Storage.news.

"The battery is regarded as a limited resource, which allows you to put in and take out electrons in a limited way. In fact, you can calculate how many electrons can be put in and out of the battery during its service life, and then reduce it to 60%, and it is not always appropriate to carry out some type of enhancement at that time," Fludder said.

Fludder said that, using the constantly developing data platform and artificial intelligence, NECES - using batteries from various suppliers - can create degraded models, which are becoming "ultra-high fidelity".

"This means that we can really push the operation of the system to the limit. When revenue opportunities appear in the market, we can basically put the system in an overload state. Therefore, when the price difference is large, we will enable our customers to drive the system to the absolute physical maximum that the system may operate, even if it will accelerate the degradation. This trade-off may be worthwhile, adding or replacing cells“

Matching degradation modeling with the way that the physical characteristics of battery assets respond to their operation mode will enable NECES and its end customers to make real-time decisions in the market "based on actual revenue opportunities," Fludder said, which will enable battery storage project owners and operators to "balance economic opportunities with how to use capital assets.".

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