This bachelor’s thesis presents an analysis of the integration of electrical energy storage systems into distribution transformer substations. It identifies the key factors that must be considered during the planning and implementation of the connection procedure to the distribution power system. Particular emphasis is placed on the impact of energy storage systems on network operation and on their contribution to increased reliability and flexibility of the distribution network.
The first part presents the theoretical background of electrical energy storage systems, their operating principles, and the main storage technologies. Special attention is given to the application of storage systems for peak shaving and improving the shape of the daily load curve, which contributes to more efficient utilization of the existing network infrastructure and reduces loading on individual network components. Furthermore, ancillary services required to ensure reliable operation of the power system are discussed, and the role of energy storage systems in their provision is defined. Due to their fast response and flexible control capabilities, energy storage systems can significantly contribute to reserve power provision, network stability, and support for voltage and frequency regulation.
The final part presents a comprehensive assessment of all distribution transformer substations operated by Elektro Primorska, the electricity distribution company. For each substation, the maximum loading before the planned installation of an energy storage system was determined based on an analysis of three years of historical electricity consumption and generation data. Using the derived load diagrams and identified maximum values, the available connection capacity for installing energy storage systems was calculated in accordance with the SDI service criteria and the static assessment method. The results indicate that the available connection capacity varies significantly among individual substations due to differences in loading levels and the age of network components. At certain locations, the integration of energy storage systems is not feasible because of insufficient available capacity or the exceedance of technical network limits.
In conclusion, the thesis highlights potential challenges and limitations that have already been identified in practical applications and may recur when integrating energy storage systems with higher rated power, as this field and technology are still undergoing rapid development. I also described a classic example of using an electrical energy storage system for distribution needs.
|
