Grid-connected advanced energy storage scheme for frequency regulation
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Grid‑connected advanced energy storage scheme for frequency regulation Iram Akhtar1 · Sheeraz Kirmani1 Received: 20 March 2020 / Accepted: 24 August 2020 © Springer Nature Switzerland AG 2020
Abstract Secure and economic operation of the modern power system is facing major challenges these days. Grid-connected Energy Storage System (ESS) can provide various ancillary services to electrical networks for its smooth functioning and helps in the evolution of the smart grid. The main limitation of the wide implementation of ESS in the power system is the high cost, low life, low energy density, etc. However, improved battery technology is changing the scenario rapidly. Also, any mismatch in power demand and supply causes fluctuation in frequency. Therefore, this paper presents a way for reducing the frequency fluctuation using an Advanced Energy Storage System with utility inductors. To compensate for the mismatch of supply and demand, a new system is proposed so that the nominal frequency of the power system is maintained. Due to the very high penetration of energy systems, there is a need for frequency regulation, hence different control strategies are employed to overcome this problem. In case of extreme power supply, the ESS acts as a load and gets itself charged whereas during the power deficit the ESS supplies power to maintain balance in demand and supply, and hence it mitigates the frequency fluctuation. The simulation model contains an ESS connected to a grid with a varying commercial or residential load profile. Simulation results illustrate the effectiveness of grid-connected ESS in minimizing frequency variation. Keywords Energy storage system · Frequency regulation · Load frequency control · Power flow analysis · Fourth keyword
1 Introduction The electric power grid is of vital significance in the present scenario. Electric power is an empowering innovation which helps in regular assignments and advanced procedures. It gives a perfect, sheltered, and flexible power supply for a large variety of applications. The power electronics devices are connected to the different sources when they are interfaced with the utility grid and they create stability issues also because of the high penetration of these devices. The energy storage system provides a quick frequency response and they have been recognized. While the growth of the storage system has made this system
feasible to be connected to the grid with desired performance, economics issues, codes are giving the walls for a high level of application and investment. The quality of electric power depends on the balance between supply and demand and this balance must be maintained [1]. This frequency variation is very dangerous to the different parts of the power system. Energy storage systems give power to the different loads when there is a shortage of power supply from the grid so that the stability of the power system is maintained due to its fast response. If the frequency severely deviates from the standard frequency, then many of the instruments connect
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