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Feed-In Management
24.3.4 Variable cos (Phi) shift factor over characteristic curve P/Pn
The function allows the cos (Phi) to be adjusted according to characteristic curve P/Pn.
With a characteristic curve P/Pn, the ratio of the currently generated power (P) to nominal power (maxi-
mum output) (Pn) is determined. A Cos (Phi) is assigned to ratio by a characteristic curve.
The function is also referred to as Phi (P).
The currently generated power (P) is calculated by the Solar-Log™ based on the inverter data. If an Utility
Meter with power measurement is available, the output value will be used instead.
Note!
Please check that all of the Solar-Logs in a master/slave setup have the same firmware
version, especially for the characteristic curve P/Pn with the Utility Meter.
Type of characteristic curve section
Using this menu item a characteristic curve specified by the grid operator can be stored. In principle a dis-
tinction is made here between a 2-point and a 4-point characteristic curve.
2-point characteristic curve
By selecting "2-point characteristic curve" it is possible to define a characteristic curve using two points.
Procedure
•
Select Variable cos (Phi) shift factor over characteristic curve P/Pn from the menu.
•
Activate the interface assignments to control.
•
Select 2-point characteristic curve.
•
Define the characteristic curve points A and B based on the boxes P/Pn and cos (Phi) and put a
check in front of inductive/under-excited.
•
SAVE the settings.
The characteristic curve displayed changes according to the values entered.
4-point characteristic curve
By selecting "4-point characteristic curve" it is possible to define a characteristic curve using four points.
Procedure
•
Select Variable cos (Phi) shift factor over characteristic curve P/Pn from the menu.
•
Activate the interfaces.
•
Select 4-point characteristic curve.
•
Define the characteristic curve points A, B, C and D based on the boxes P/Pn, cos (Phi) and put a
check in front of inductive/under-excited.
•
SAVE the settings.
The characteristic curve displayed changes according to the values entered.
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