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d)
Reactive Power Limit
There are four modes of reactive power limitation can be selected.
Cos(phi) fix mode: In this mode, the ComBox will regulate the reactive
power of inverter according to the Cos(phi) value which is set by the user.
Enter the Cos(phi) value and choose the phase as shown in Fig.5-12.
Fig. 5-12: Cos(phi) fix mode
Cos(phi) variable mode: In this mode, the ComBox will produce a curve
according to the “P/Pn”, “Cos(phi)” and the phase of points 1,2,3 and 4, and
will regulate the reactive power according to this curve, as shown in Fig. 5-
14.
Fig. 5-13: Cos(phi) variable mode
0.95
0.4
0.6
0.8
P/Pn
Cos
φ
1
0.2
0.95
Leading
Lagging
Fig. 5-14: Cos(phi) variable Cure
