Parameters vacon • 156
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6
MPPT Oscillation Damping
If the power regulation enters the “current source” branch of the panel current/voltage char-
acteristic, the typical result is a oscillation in DC voltage and output frequency. The damping
logic recognizes oscillation in DC voltage and quickly increases the voltage reference correc-
tion term. This brings the panels back in “voltage source” branch.
P3.22.2.14 D
AMPING SENSITIVITY
P3.22.2.14 parameter determines the amplitude of oscillation, to be recognized.
If the value is too low, normal variation in voltage level could be considered oscillation, and the
DC voltage reference incorrectly increased.
P3.22.2.15 D
AMPING TIME
Oscillation is recognized when the logic sees three maximum and minimum point during the
time defined by P3.22.2.15.
If the time is too short, the logic could fail with slow oscillations.
If the time is too long, spaced and unrelated min and max points could be confused with an os-
cillation.
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