Betriebskonzepte für Batteriespeichersysteme in hochausgelasteten Übertragungsnetzen

Description

This thesis analyzes the impact of different operation concepts for battery energy storage systems on power system stability utilizing time domain simulations. The battery energy storage systems are utilized as so-called “grid booster” in a point-to-point grid booster configuration and a systemic grid booster configuration.
This thesis gives an overview on the concept of preventive congestion management, the related processes during system planning and real-time operation as well as the new concept of corrective system operation including the concept of grid boosters. Additionally, a literature review regarding the impact of higher grid loading on power system stability and the possibility of an operational dynamic stability assessment is presented. The operation concepts include the operation as a counter measure for grid congestions, the operation as a source of ancillary system services in order to stabilize the power system as well as combined Multi-use-concepts as counter measure and source of ancillary system services. The impact of different grid booster operation concepts is analyzed by utilizing positive sequence time domain simulations based on a dynamic network model of the European transmission system. The required dynamic models for network elements and controllers as well as necessary modelling steps are presented. Two converter control concepts are implemented for the BESS, grid-following and grid-forming converter control respectively, in order to enable the provision of virtual inertia as ancillary system service.
The results highlight the importance of multi-use-concepts for grid booster. Utilizing stability indicators, the different grid booster operation concepts are evaluated in an exemplary implementation of a DSA process. Based on the assessment, an optimal operation concept can be derived depending on the current grid situation.