◦ “10341 Freq. dep. derating of power” and “05.28 P derating(f) [%]” indicates 12
◦
%
The derating becomes inactive, if the frequency becomes lower than F
Stop
(Parameter
). (If the frequency becomes too high, the frequency monitoring function trips.)
Example 3: Explanation of Parameter “5785 Hold max.derating”:
If the frequency decreases, while the derating is still active, the behavior depends on
parameter “Hold max.derating” (parameter
The following assumptions are made:
• The corresponding parameters are set to default
•
• Derating has started with F
Start
= 50.20 Hz with P
M
= 130 kW
•
• The current frequency is 50.70 Hz → reduction ΔP = 26 kW current power = 104 kW
•
Now the measured frequency decreases to 50.50 Hz:
• Hold max. derating” (parameter
) = Off
•
The derating ΔP decreases to 15.6 kW according to the gradient 40 %/Hz the power
is increasing to 114.4 kW.
• Hold max. derating” (parameter
) = On
•
The derating still remains at 26 kW the power remains at 104 kW. During an active
derating process, the power will never increase again. The power can only increase
again if the derating becomes inactive, that means that the measured frequency has
reached F
Stop
.
4.4.4.5.6
Photovoltaic (PV) load reduction regulated mode
General notes
The easYgen offers a function to reduce the power output of photovoltaic inverter (PV
Inverter). This could be important in cases where Gensets running side by side with PV
inverter. Mainly in island applications where the consumer load can be so low that a fixed
PV power drives the Gensets into reverse power. But even in cases where a minimal
generator load output is underrun over longer time it is beneficial to reduce the PV power.
To maintain this, the easYgen offers a PV load reduction respectively a PV load setpoint to
send to the PV inverter.
The PV load reference function contains a monitor of generator reverse power. It can
be used e.g. to open the PV inverter breaker when the reverse power becomes critical.
(Refer to
╚═▷ “4.5.6.15 Monitoring PV load reference”
).
Function
With knowing the system load the easYgen3000XT regulates the PV power so that a given
generator load level is kept.
The PV regulation output is PID control loop based on:
• The generator real load [%]
•
• The configurable generator minimal load [%]
•
371
easYgen-3000XT Series
B37574
4 Configuration
4.4.4.5.6 Photovoltaic (PV) load reduction regulated mode
Released