Product Manual

Operation
900-0161-01-01 Rev B 37
Grid Support
The Radian meets the definition of a “Grid Support Utility-Interactive Inverter/Converter” as
described by UL 1741 SA. Grid support functionality makes use of the inverter’s capabilities to
prevent destabilization of the utility grid.
Grid Support
functionality is only available in the
Grid Tied
and
GridZero
input modes. When
either mode is selected, the settings within the
Grid Support
menus are active. The default
settings support only the standard voltage and frequency magnitude and trip limits specified by
IEEE 1547. All other advanced grid support functions are disabled. If local jurisdiction requires
grid support functionality, some or all of the advanced functions may be required.
The standards set by different utility companies or local jurisdictions require different parameters
and settings. The general parameters used by
Grid Support
are displayed under the following
screen selections. Installing a .GIP file (as instructed by the
Installation Manual
) will
automatically load a package of
Grid Support
settings.

Regulatory Specification
— the code or utility company regulation which indicates the following
settings (preloaded by the .GIP file).

Low/High Voltage Ride-Through
2
— the high or low limit for AC voltage disturbances. If these limits
are exceeded for the
Trip
time or longer, the inverter will disconnect from the utility grid. For a lesser
duration the inverter is required to “ride through” the disturbance and remain connected.

Low/High Frequency Ride-Through
2
— the high or low limit for AC frequency disturbances. If these
limits are exceeded for the
Trip
time or longer, the inverter will disconnect from the utility grid. For a
lesser duration the inverter is required to “ride through” the disturbance and remain connected.

Fixed Power Factor
— the power factor to be produced by the inverter when offsetting or selling.

Ramping
— the rate of power increase when first ramping (
Start Ramp
) and subsequent increases
in offsetting or selling (
Normal Ramp
).

Frequency Watt
— consists of two functions.
 When the AC input frequency increases above the nominal value, the inverter will reduce offsetting.
 When the AC input frequency decreases below the nominal value, the inverter will increase offsetting or
reduce charging.

Volt Watt
— consists of two functions.
 When the AC input voltage increases above the nominal value, the inverter will reduce offsetting.
 When the AC input voltage decreases below the nominal value, the inverter will increase offsetting or reduce
charging.

Volt/VAr
— consists of two functions.
 When the AC input voltage decreases below the nominal value, the inverter will produce reactive power.
 When the AC input voltage increases above the nominal value, the inverter will consume reactive power.

Reconnect Parameters
— the AC voltage and frequency limits which must be met before the
inverter can connect (or reconnect) to the utility grid.

Multi-Function Parameters
 % of Sell Current Limit — for use in future revisions of firmware.
 % of Charge Current Limit — for use in future revisions of firmware.
2
The settings required by IEEE 1547 for voltage and frequency magnitude and their trip limits are the default settings for these
menu items.