Plug&play digitization system for grid analysis in low voltage distribution networks

Abstract:
The transformation of conventional distribution networks into smart grids requires a higher degree of observability in grid operation. This paper presents a plug&play measurement retrofit system which can be easily installed in existing low voltage substations and cable distribution cabinets because of its compact design. The system enables a digitization of existing infrastructure and hence delays or avoids investments into new assets. Moreover, the localization of faults in low voltage distribution networks can be improved and thus a more efficient fault clearance is achieved. Measurements of electrical parameters, such as voltages and power flows, can support future distribution grid planning. Additionally, the availability of sufficient real-time grid data is a prerequisite for the intelligent control of bidirectional power flows induced by novel customer systems, such as electric vehicles, heat pumps and photovoltaics. The system offers high potential for a large-scale rollout as there are approximately 600,000 low voltage substations in Germany alone. This paper describes the plug&play measurement system and presents first results from a field test in a real low voltage distribution network. Furthermore, the usability of the data for different smart grid applications is discussed and an outlook regarding possibilities and challenges of a large-scale rollout of the technology are described.