DUAL BATTERY STORAGE
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This document discusses different battery energy storage system configurations for off-grid renewable energy systems. It describes lead-acid batteries which are commonly used for energy storage and explains that a dual battery energy storage system using a main bank and secondary bank can significantly increase battery life. By using the main bank for 90% of energy needs and the secondary bank for 7.5% with the diesel generator covering the remaining 2.5%, the overall storage system costs are reduced.
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A hybrid renewable energy system is at present accepted globally, as the best option for rural electrification particularly in areas where grid extension is infeasible. However, the need for hybrid design to be optimal in terms of operation and component selection serves as a challenge in obtaining reliable electricity at a minimum cost. In this work, the feasibility of installing a small hydropower into an existing water supply dam and the development of an optimal sizing optimization model for a small village-Itapaji, Nigeria were carried out. The developed hybrid power system (HPS) model consists of solar photovoltaic, small hydropower, battery and diesel generator. The optimal sizing of the system’s components for optimum configuration was carried out using Genetic Algorithm. The hybrid model’s results were compared with hybrid optimization model for electric renewable (HOMER) using correlation coefficient (r) and root mean square error (RMSE) to verify its validity. The results of the simulation obtained from the developed model showed better correlation coefficient (r) of 0.88 and root mean square error (RMSE) of 0.001 when compared to that of HOMER. This will serve as a guide for the power system engineers in the feasibility assessment and optimal design of HPS for rural electrification.
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energy&fire
1) The document discusses sulfation buildup in batteries which occurs when batteries are left unused or in extreme temperatures. This sulfation decreases battery performance over time.
2) It then describes a battery regeneration technology called Electro-Chemical Battery Enhancement Process (EBEP) that can revive sulfated batteries and restore their capacity. The EBEP process diagnoses the battery, proposes a revival plan, and regenerates the battery through processes like levelling, reactivating, and equalization.
3) EBEP is said to double battery life, recover capacity and performance, and reduce water loss, charging requirements, and corrosion. It provides an environmentally friendly alternative to frequent battery replacement that saves costs
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DUAL BATTERY STORAGE
- 2. Lead-acid batteries are now widely used as storage elements It maintains the power balance between generation and consumption. Comparison of three types are explained in this paper. The DBESS configuration significantly increases the life of the Battery, reducing the operating and maintenance costs of isolated systems by more than 19%.
- 3. At initial sizing, battery banks can participate approximately with up to 52% of the total system investment EXAMPLE: In Brazil, battery manufacturers have provided lead acid batteries designed for PV applications, with a projected useful life of 4 to 5 years. However, in practice, these values have not exceeded 2 years. In this context, it is important to invest efforts on research to solve this problem.
- 4. To increase the lifespan and the state of charge (SOC) of battery. Reducing the operating and maintenance costs of isolated systems To reduce power mismatch between generation and load
- 5. This method has charging and discharging in a short period of time It prevents the bank from being fully charged leading to the formation of lead sulphate. EFFECTS: Consequent loss of useful life Low efficiency Leads to battery failure.
- 6. We use diesel generator in addition to reduce the over dependency of battery. DRAWBACK: Increase in cost.
- 7. HESS usually consists of a high-energy subsystem (usually batteries) and a high-power subsystem (usually super-capacitors). The high-energy subsystem is responsible for meeting demand over long periods. The high-power subsystem is responsible for absorbing transient oscillations in the power balance between generation and demand DRAWBACK: Cost
- 8. Main bank : It is the bank of greater capacity, being responsible for storing energy when the primary renewable sources are available and to meet the load demand when these are not available, or according to an optimal dispatch. Secondary bank : It is a lower capacity bank used to meet the needs of daily instantaneous balance and the voltage regulation of the microgrid.
- 9. •The main bank is sized to meet at least 90% of the power. • The secondary bank should account for up to 7.5% of the remaining occurrences. • The last 2.5% of the remaining occurrences should be complemented by the diesel generator.
- 13. The proposed strategy has preserved the useful life of the whole storage system, especially the main bank, which is the most expensive. This operational advantage brings the percentage of investment of batteries to 33% of total investment.
- 14. Thank you