36 Program features
Droop P(U) limitation curve
When average grid voltage exceeds the value in parameter 130.77 P(U) trigger level,
droop limitation is activated. The power limitation gradient is calculated based on the grid
voltage and values in parameters 130.77 P(U) trigger level, 130.79 P(U) limit level, and
130.82 P(U) end level.
Limitation is in effect until the voltage drops below the value defined in parameter 130.78
P(U) release level. When the average grid voltage falls below the value in parameter
130.78, the power limit is released and power is ramped up using parameter 130.81 P(U)
release ramp. The delay time before releasing the power limit can be set with parameter
130.85 P(U) release time.
The average grid voltage is filtered with a time constant defined in parameter 130.83 P(U)
filtering time constant. Parameter 130.84 P(U) reference power selects the power level
used as the power limitation curve start point, either nominal power or the power at the
time of exceeding the trigger level.
Figure 16. Droop P(U) limitation curve
P
lim
/%
U/V
P(U) limit type = Droop
Limit gradient
130.81 P(U) release ramp
130.79 P(U) limit level
130.78
P(U) release level
130.77
P(U) trigger level
130.82
P(U) end level
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