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Current research on energy storage control strategies primarily focuses on whether energy storage systems participate in frequency regulation independently or in coordination with wind farms and photovoltaic power plants .
Proposing a flexible regulation scheme for energy storage systems involved in frequency control, and dynamically adjusting synthetic inertia and damping coefficients according to state of charge (SOC) levels.
However, in real-world scenarios, the capacity of energy storage systems is subject to inherent limitations. Using the maximum droop coefficient in both charge and discharge modes during the initial frequency control phase can easily cause the SOC of the energy storage device to exceed its operational limits.
Relationship between unit regulation power of energy storage and SOC. The blue line represents the discharge power curve, indicating the reduction in power as the state of charge (SOC) decreases. The red line represents the charge power curve, showing the increase in power as SOC rises.
Another issue of the Cameroon power system is the absence of energy efficiency or demand side measures, which guarantees a safe, reliable and affordable option to reducing emissions and demand according to International Renewable Energy Agency (IRENA) .
The national electricity access rate in Cameroon is 70% (IEA, 2020b) and has grown considerably compared to the previous years due to a series of projects such as the newly constructed Memve'ele hydroelectric station, the recuperation of the Limbe power plant, and the implementation of some solar photovoltaic (PV) projects.
Three scenarios are developed, and the allocation of power generators to meet the electricity demand at a particular time is based on the 25% renewable energy target in the Cameroon NDCs by 2035, the GDP, the load duration curve, and the mean plant capacity factor which are entirely stated exogenously.
This projected 5.9 GW capacity savings is more than the total anticipated hydropower capacity in the Energy Sector Development Project (PDSEN) of the Cameroon's Ministry of Energy and Water Resources .
When the demand for electricity fluctuates throughout the day, the power grid must be continuously adjusted to ensure a consistent frequency. The lack of sufficient energy storage solutions, combined with fluctuations in energy production mainly due to an increase in solar and wind power, creates an urgency for modern energy solutions.
Batteries and other energy storage systems can quickly discharge or absorb energy to help balance the grid. These systems are particularly useful for managing short-term fluctuations. Demand response programs incentivize consumers to reduce their electricity usage during peak demand times or when the grid is under stress.
Meanwhile, the inherent randomness and intermittency of RESs cause frequency stability issues for power systems with a high proportion of RESs penetration. ESSs, due to their fast response and flexible control ability, are increasingly considered ideal resources for frequency support.
In addition, due to the fluctuating nature of RESs, energy storage devices have a high cycling frequency, which poses a challenge to battery life and performance. 10. Conclusion and recommendation This review comprehensive analyses the control scheme for ESSs providing frequency regulation (FR) of the power system with RESs.
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