Energy storage systems are one of the key technologies for the energy turnaround. With their help, the fluctuating supply of electricity based on photovoltaics and wind power can be stored until the time of consumption.
The new energy module of KIT generates, stores, and distributes electricity. In addition, it balances fluctuating renewable energies. (Montage: PCE/KIT)
Apart from the battery, the key component of the stationary energy storage system is an adapted power electronics unit for charging and discharging the battery within two hours only. Hence, the stationary storage system can be applied as an interim storage system for peak load balancing. During times of weak loads, solar energy and wind electricity are fed into the battery. At times of peak load, the energy from the photovoltaics system, wind generator, and battery is fed into the grid. Apart from load management, night discharge is of significant economic importance, because consumption of photovoltaics energy by other electric devices of the user can be increased considerably. The battery is charged in the afternoon and discharged during darkness until the next morning.
“Controlling the interaction of solar cells, wind generator, storage systems, and the grid is the central challenge,” Gutsch explains. System control always has to reliably and precisely interfere with the multitude of operation states. Only this will ensure a good service life and performance of the lithium-ion batteries in the long term and, hence, economic efficiency of the complete system. “Such a system can be controlled 24 h a day and 365 days a year with detailed battery know-how. Only then will economically efficient and safe operation be guaranteed for decades,” emphasizes Gutsch. After first functional tests, concrete application systems of variable power will be produced in cooperation with industry.In spite of the high costs of lithium-ion batteries, this technology may be worthwhile today already, in particular in regions that do not have any stable grids. Smaller and larger islands, for example, are often supplied with electricity by diesel generators. In Africa and India, large areas are not supplied with electricity at all. A photovoltaics system with a coupled lithium-ion battery can be applied profitably, if appropriate system design and load profile are chosen. With decreasing costs of system components, we will achieve “battery parity” in Germany, in analogy to the “grid parity” already reached for photovoltaics-based electricity consumption by the private customer.
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Monika Landgraf | EurekAlert!
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