Potential Operating Range Of The Inverter In Conjunction With Reactive Power; Overview Of Reactive Power Control Options - Fronius SnapINverter Serviceanleitung

Potential operat- Reactive power mode is restricted by the maximum output current (maximum apparent
ing range of the power) as well as by the operational reactive power limits of the inverter:
inverter in con- -
junction with re- -
active power -
The figure below shows the potential operating range of the inverter. All valid operating
points defined by effective power P and reactive power Q are within the grey area.
Example for Fronius Galvo
For example, fixed values or curves can be specified within the operating range that define
the reactive power response of the inverter. Reactive power operation is only possible
when a DC supply is present.
Overview of reac- The following options for switching reactive power and for controlling the inverter are avail-
tive power control able:
options -
-
-
-
-
-
Only one reactive power mode can be used at any one time to control the inverter.
82
cos phi = 0.85, Q = 53 %
rel
cos phi = 0.70, Q = 71 %
rel
cos phi = 0.00, Q = 100 %
rel
under-excited (inductive)
cos φ = -0,85
Q = -100 %
rel
Q = Reactive power [VAr]
P = Effective power [W]
S = Nominal apparent power [VA]
n
cos phi = power Pactor
Q = Operative reactive power limit of the inverter [%]
rel
Const. Cos φ
Const. Q Rel
Const. Q Abs
Ch Cos φ(P)
Ch Q (U)
Ch Q (P)
(Galvo)
(Symo S, Symo M -8k2, Symo Hybrid, Primo -8k2, Primo US -8k2)
(Symo M -20, Primo US -15, Eco, Symo US -24, Symo US (Eco)
P
Q = -53 %
Q
rel
over-excited (capacitive)
cos φ = +0,85
Q = +53 % Q = +100 %
rel rel