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Page 48
9.12.9
Reactive power operation mode
Note:
Reactive power can be used in
electrical energy supply networks to bolster
the level of voltage. As such, feed-in inverters
can contribute to statistical voltage stability.
The <Settings for> menu is opened.
1.
Select <Reactive power settings>.
2. Select control process > see basis and
set subsequent processes <Cos-phi
constant>, <Cos-phi(P)>, <Q constant>,
<Q(U)>.
3. Set <Settling time setting> for selected
control process.
Note:
A change in the reactive power may
be necessary in order to meet the
requirements of a first-order filter.
» Reactive power process defined.
Fig. 116.
Set the settling time
Fig. 117.
Select reactive power
settings
Fig. 118.
Specify the operation mode
Basis
There are four types of reactive power
control. Only one mode of operation can be
active at any given moment.
From the perspective of the grid, the inverter
behaves like a load in accordance with the
national standard. This means that the
inverter operates in quadrant II (under-
excited) or III (over-excited) as shown in Fig.
Definition
Over-excited reactive power, also known as
capacitive reactive power or leading power
factor.
Under-excited reactive power, also known as
inductive reactive power or lagging power
factor.
Fig. 119.
Load reference arrow system
