3)
Frequency-Watt (FW) function
: the inverter may change its active power output with changes in grid frequency.
The figure below shows an example as reported in UL1741 Supplement SA standard.
Figure SA14.1
Freq-Watt characteristic #1 (maximum slope)
4)
Volt-Watt (VW) function
: the inverter may change its active power output with changes in grid voltage. The
figure below shows an example as reported in UL1741 Supplement SA.
Figure SA15.2
Volt-Watt characteristic #2