PV-Battery Energy Storage Projects - Lessons Learned: Installations at KIT and at the Helmholtz Institute Ulm

摘要

Efficient and economical energy storage technologies are key elements in enabling a sustainable energy supply based on renewable energies. For this reason research into different solar photovoltaic energy storage systems is pushed forward at KIT. While two stationary storage pilot systems started operation at KIT in early 2013, one further system started operation in May 2015 in Ulm. The installations vary in size and design and were tailored to suit the local conditions and energy requirements. The performance analysis of each system allows one to evaluate the different power electronics components and batteries as well as the pros and cons of the system designs and control strategies. For an efficient system and high system availability it is essential that the different components of the system work perfectly together. The uniqueness of the results obtained here can be attributed to the variety of different systems that were studied in the field as well as the large volume of data that was collected and analysed. These findings will directly influence the design as well as the operation of future systems. Besides the technical aspects mentioned, successful completion of such projects requires a good knowledge of the existing norms as well as effective communication and cooperation between the relevant project partners. In conclusion, various lessons were learned during the design phase, the construction and start-up phase as well as the operation phase of the above-mentioned projects, especially of the project at the HIU in Ulm. The different aspects that need to be taken into consideration to carry out a storage project successfully will be illustrated by means of examples.