Safety And Grid Requirements; Feed-In Limitation - Fronius Tauro 50-3 Operating Instructions Manual

Safety and grid requirements

Feed-in limita- DNO or grid operators may stipulate feed-in limitations for an inverter (e.g. max.
tion 70% of kWp or max. 5 kW).
The feed-in limitation takes account of self-consumption before the power of an
inverter is reduced:
There are two options for the feed-in limit:
a)
b) Power reduction by external plant controller
The following formulas provide guidance as to which solution may apply:
P
0% P
0% P
Solution a) - Power reduction of a single inverter
The specifications can be met if the prescribed feed-in limit is achieved by redu-
cing the power of a single inverter to ≥ 0%.
Example:
there are 3 inverters in a system: 1x Fronius Tauro 100 kW, 2x Fronius Tauro 50
kW. The specified feed-in limit at the transfer point must not exceed 100 kW.
Solution:
the Fronius Tauro can be regulated to 0% output power to meet the feed-in limit.
The outputs of the other two inverters are not reduced and can feed in at any
time without restriction.
If the power reduction of an inverter to 0% is not sufficient, solution b) must be
applied.
Solution b) - Integration of a plant controller
This solution is used if the specifications of the grid operator cannot be met by
limiting a single inverter, or if permanent access (e.g.: remote shutdown) is re-
quired. In this case, the integration of a PLANT CONTROLLER is recommended.
A detailed technical overview of this solution can be found at www.fronius.com
under the keyword "feed-in management".
To benefit from the advantages of Fronius Solar.web, in addition to the monitor-
ing function of the PLANT CONTROLLER SYSTEM a Fronius Smart Meter can
also be installed. The integration of a Fronius Smart Meter ensures that the load
and feed-in data of the PV system are visualised in Fronius Solar.web and are
available for analysis.
I/O power man- General
agement In this menu item, settings relevant for an electricity company (DNO) are made.
An effective power limitation in % and/or a power factor limitation can be set.
IMPORTANT!
The service password must be entered in order to adjust settings in this menu
item. Settings in this menu area must only be made by trained and qualified per-
sonnel.
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Simple power reduction of an inverter using Fronius Smart Meter
... Inverter power n
WRn
+ 100% P
WR1 WR2
+ 100% P
WR1 WR2
+ 100% P ... ≤ Feed-in limit → Solution a)
WR3
+ 100% P ... > Feed-in limit → Solution b)
WR3