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Eberhard Waffenschmidt,
"Dimensioning of decentralized
photovoltaic storages with limited feed-in power and their impact on
the distribution grid",
Proceeedings of the International
Renewable Energie Storage (IRES) Conference 2013, Berlin, Germany,
18.-20.Nov. 2013, Session D2.
also published as:
Eberhard Waffenschmidt,
"Dimensioning of decentralized
photovoltaic storages with limited feed-in power and their impact on
the distribution grid",
Energy Procedia (2014), 31.Jan. 2014, pp.
88-97,
Reference: EGYPRO7750, DOI information: 10.1016/j.egypro.2014.01.161.
The growth of
photovoltaic (PV) in
Germany frequently reaches its limit due to constraints in the
distribution
grid. In addition, we soon face an excess of renewable energy at
certain day
times. For both, distributed storages are a good solution.
Here, at first limitations in the
distribution grid are analyzed in typical residential areas, which are
rural
region, suburbs, town center and multistory building areas. As limiting
parameters the rated power of the transformer and cables as well as
voltage
limits are considered. The possible feed-in power is related to the
potential
of PV in the corresponding area. As a result in suburb and rural areas
only a
fraction of the PV potential can be used. The same analysis was also
performed
assuming PV storages and a feed-in power limitation of 30% of the
related PV
peak power. A significant improvement of the use of the PV potential results.
Next, the consequences of a feed-in
power limitation are investigated. Depending on the limit height,
without
storage a certain amount of energy is lost. With 30% peak power limit,
2/3 of
the PV energy is fed in, while with a “large” storage, more than 90% is
fed-in
(orange). The variation of the storage size
reveals a reasonable size of 4 kWh, scaled to a PV system
of 1 kWpk.
Another criterion for the storage
size is the optimization of self-consumption. A full autarky needs a
very large
storage covering seasonal storage. A plateau is visible for 2 kWh,
scaled to a
self-consumption of 1000 kWh/a, which relates to a daily storage and is
independent of the PV size.
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Thema
> Speicher (storage)
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Grade of autarky as a function of the battery size for various sizes
the PV
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