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Gepoolte PV-Heimspeicher zur Bereitstellung von Primärregelleistung

: Hollinger, Raphael
: Engel, Bernd; Wittwer, Christof

München: Verlag Dr. Hut, 2018, XXV, 137 S.
Zugl.: Braunschweig, TU, Diss., 2018
ISBN: 978-3-8439-3689-7
ISBN: 3-8439-3689-7
URN: urn:nbn:de:101:1-2018090723354140041255
Fraunhofer ISE ()

The local production of solar energy by PV systems for self-supply with electrical energy is both economically and ecologically interesting and has been common for many years, especially in single-family houses. A growing proportion of these single-family houses with a PV system is using a locally installed battery to further reduce the electricity consumption from the public electricity grid. The batteries store the excess electricity from the PV system for later withdraw to cover the electrical load. However, to install and operate batteries alone for this purpose is often not economically feasible and also not necessarily beneficial from a systemic perspective. The concept developed in this work to provide primary control reserve (fastest type of operating reserve) by PV home batteries can generate additional streams of revenue for the investment-intensive battery. In addition, the concept contributes to a secure and cost-effective energy transition, since only the provision of the ancillary services by storages and renewable energies enable the temporary shut down of conventional power plants. The developed algorithms implement the concept of using PV home batteries, both for increasing the local degree of self-sufficiency and for providing primary control reserve optimally. In addition to the dual-use algorithms, a pooling strategy has been developed for the optimal provision of electrical power from multiple individual home batteries. This allows to maximize efficiency (especially with respect to the inverter efficiency) and prevents individual batteries from reaching capacity limits while other batteries in the pool still have capacity reserves. The development of an algorithm for the optimal utilization of regulative degrees of freedom in the provision of primary control reserve enables to influence the cumulative energy provided in the primary control reserve and thus the development of the state of charge. It can be used to stabilize the storage level, thus increasing the resilience of the pool and minimizing corrective measures to avoid full or empty batteries. The cost-effectiveness analysis shows the high economic potential of both the double use of the battery and the algorithms for optimizing operation. The work also contributes to the assessment of the impact of different regulatory frameworks on storage capacity and the degree of freedom in the provision of primary control reserve.