38 Program features
Power gradient
The power gradient functionality limits the rise rate of active power to a predefined value.
This can help to stabilize the grid as power is not changed too rapidly. The power gradient
functionality can be enabled with parameter 130.92 Active power ramping and the rise rate
can be set with parameter 130.93 Active power ramp. If the power change is small, the
rise rate limit follows the actual power closely. When active power starts to increase
rapidly, the limit is activated until actual power stabilizes.
Figure 19. Power gradient: Active power ramp curve
For controlled stopping, a shut down ramp can be implemented with which power is
reduced slowly to zero after which the grid contactors are opened. The ramp can be
defined with parameter 130.94 Shut down ramp. The internal limit follows the actual power
and after the inverter operation is deactivated, the power limit ramps to zero. This does not
affect grid disconnection time in case of faults or grid disturbance.
Figure 20. Power gradient: Shut down ramp curve
Settings
See parameters: 130.62...130.76, 130.92...130.94, 130.98 and 130.99
130.93 Active power ramp
P
t
Stop command Actual stop
P
t
130.94 Shut down ramp
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