For a grid connected BESS (lets say 100 MW/200 MWh system, LFP battery), if we charge the BESS in such a way that whenever we can access power from the solar that will charge the BESS. Hence it can be like, the BESS can have 10 partial charging and 10 partial discharging per day. Instead of direct 2 hours of fixed charging and 2 hours of fixed discharging, does these sort of continuous partial charge-discharge do any harm to the BESS in terms of degradation, performance, or any other technical issue?
Look forward to your answer. Thanks in advance.
The question of the role of partial charging and discharging on the ageing and degradation of battery components is similar to that already raised on ResearchGate concerning entropic temperature variation and its measurement. It has been used to explain the charging and discharging processes in dielectrics, where by applying the laws of physical chemistry, it is possible to predict the lifetime of a material. It is likely that these laws apply to batteries. The difference in behaviour as a function of charge/discharge kinetics is linked to temperature and heat diffusion.
BESS operators using time-of-use pricing in the electrical grid need to operate the BESS effectively to maximize revenue while responding to demand fluctuations. Battery energy storage (BESS) is needed to overcome supply and demand uncertainties in the electrical grid due to increased renewable energy resources. BESS operators using time-of-use pricing in the electrical grid need to operate the BESS effectively to maximize revenue while responding to demand fluctuations. However, excessive discharge depth and frequent changes in operating conditions can accelerate battery aging. Deep discharge depth increases BESS energy consumption, which can ensure immediate revenue, but accelerates battery aging and increases battery aging costs. The proposed BESS management system considers time-of-use tariffs, supply deviations, and demand variability to minimize the total cost while preventing battery aging. In this study, we investigated a BESS management strategy based on deep reinforcement learning that considers depth of discharge and state of charge range while reducing the total operating cost. In the proposed BESS management system, the agent takes actions to minimize the total operating cost while avoiding excessive discharge depth and low state of charge. A series of experiments using a real BESS demonstrated that the proposed BESS management system has improved performance compared to the existing methods.
Thanks so much, Osama Bahnas for your answer. You mentioned proposed BESS management system and a related study in your answer. Did you meant to refer to any paper? Can I please get a title of the paper you referred.
Thanks so much, Claude Le Gressus for your answer. Is there any simple model or equation that would give an approximate idea about the percentage of the battery degradation? Would love to get referred to any paper as well.
Hi Shaikat Debnath
YOU: It gives me a proper idea about the basic philosophy of the degradation
I think that a damage philosophy that has been successfully applied to many other problems would be useful for batteries. This philosophy has different levels with :
- evaluating publications by their size, statistical power and impact on resources. This is a quantitative method that avoids over-evaluating studies and multiplying work in uncertain directions.
- the collection of observations relating to damage processes that are linked to fundamental physical-chemical processes,
- the search for an experimental damage law,
- transforming this law into an equation of state that links the factors of the damage law to the parameters of a reliability law.
- the final stage is the choice of appropriate characterization methods.
YOU :Is there any simple model or equation that would give an approximate idea about the percentage of the battery degradation?
A very simple calculation gives the lifetime of a battery as a function of its operating history. However, I don't share this calculation with you, as it would be impossible to understand without understanding the damage mechanism. It is very simple to understand, but there are many forks in the road.
I am in the process of completing some training material which will be available in about two months.
YOU: Would love to get referred to any paper as well.
Bibliographic research has not so far been able to find any precedence for this approach.
YOU :Does continues partial charging/discharging do any harm to the BESS performance and degradation?
You will find a damage law in the field of partial discharges, but it has not been proven as such and its explanations are not physical chemistry.
I hope these comments will encourage you to follow your intuition.
Claude
It is fair to say that BESS technology is in its infancy and there remains a lot to learn. There is no good guidance on the spacing of units as yet and fire risk is still a serious issue. What happens as they degrade is not known, although their capacity certainly degrades in car batteries.
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