FIMER_UNO-DM-3.3_3.8_4.6_5.0-TL-PLUS-US-Q_Quick Installation Guide_EN_RevD
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3. Reactive power control
The inverter provides several modes of operation for reactive power control
and are described below:
• Disable: This is the default setting. Under this setting, the inverter exports
with a power factor of 1.0.
•
Fixed power factor control (Cosɸ set): In this mode, the operator can set
the output power factor to a fixed value. When enabled, a new value will
be set in the inverter.
• Q Fixed (Q Set): Sets the reactive power to a fixed value. When enabled,
a new value will be set in the inverter.
•
Power factor as function of output power (Watt/Cosφ Settings: Cosφ(P)):
In this mode, the inverter reduces the power factor (cos-phi) as a function
of the output power at a given operating point. The 4 points of the default
curve, where you can set the % of Pmax values and related cos-phi, can
be modified using the internal Webserver. When enabled, the curve will
be set in the inverter.
• Dynamic Volt/VAR control (Volt/VAr Settings: Q(V)): Under this mode,
the level of reactive power exported by the inverter is a function of the
operating grid voltage, also known as a Volt/VAR curve. The 4 points of
the default curve, where you can set the % of Vnom values and related %
of Smax, can be modified using the internal Webserver. When enabled,
the curve will be set in the inverter.
4. Active Power Control
This inverter offers several modes for active power reduction.
• Active Power Curtailment: Sets a new value of active power as % of
Pmax. When enabled, a new value will be set in the inverter.
• CEI Average VGrid Derating (only italian grid standard): Sets, after a
specific threshold, an active power derating based on the average of Vac
on 10 minutes as per CEI-021 italian grid standard.
• Volt/Watt settings: P(V). Under this mode, the level of active power
exported by the inverter is a function of the operating grid voltage, also
known as a Volt/Watt curve. The 4 points of the default curve, where you
can set the % of Vnom values and related % of Pmax, can be modified
using the internal Webserver. When enabled, the curve will be set in the
inverter.
• Frequency/Watt function (Frequency Control: P(f)): In this mode, the
inverter limits the active power as a function of the grid frequency.
5. Ramp control
The inverter is designed to control the rate at which output power is
increased, either at startup, or after a temporary low power condition on the
PV array (such as fast shading). The following ramp controls are provided
on this inverter.
• Normal ramp: The normal ramp defines the maximum rate at which the
inverter can increase the output power under normal operation. The
normal ramp control limits the fluctuations in the output power in order to
prevent instabilities on the utility grid.
• Soft start: The soft-start ramp defines the maximum rate at which the
inverter can increase the output power when the inverter is first starting
up. This startup may occur on a daily basis or when the inverter restarts
after an abnormal grid event has ended.
READ THE MANUAL –
E
Refer to the dedicaterd application note
in the FIMER Solar website for more details about the grid support
functions.
For more information
please contact
your local FIMER
representative or visit:
fimer.com
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shall prevail. FIMER does not accept any responsibility
whatsoever for potential errors or possible lack of
information in this document.
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26-04-2021
