COMPARISON OF DECENTRALISED AND CENTRALISED GRID-COMPATIBLE BATTERY STORAGE SYSTEMS IN DISTRIBUTION GRIDS WITH HIGH PV-PENETRATION

摘要

Due to the high amount of installed solar power systems in Europe and especially Germany, the low-voltage distribution grids reach their maximum capacities during periods of high insolation. As an alternative to grid-reinforcement, local battery storage systems can be used to store the surplus generation and limit the feed-in power of the solar power systems. For this purpose, decentralized PV home-storages in single households as well as larger stationary battery systems supplying a whole local grid area can be called into action. In this paper, a grid-compatible storage operational strategy is simulated using standard load profiles and statistically generated realistic load profiles for use with both storage types. The goal of this research is to investigate a grid-compatible and also economic storage operation when using centralized large-scale batteries instead of PV home-storage systems in a low-voltage distribution grid with a high degree of decentralized PV-generation. Results show that large-scale systems provide advantages regarding grid-related operation as well as economic feasibility and therefore represent a useful alternative to home-storage systems. Additionally, it can be shown that depending on which storage type is simulated, different requirements are imposed. The simulation of decentralized home-storages needs real load profiles in order to receive realistic results, while the operation of large-scale battery storages can be simulated using standard load profiles.