Advanced Grid Features": Reactive Power Mode; General Information About Reactive Power Mode - Fronius Galvo Serviceanleitung

"Advanced Grid Features": Reactive Power Mode

General informa- The country setup entered on the inverter ensures that the relevant operating modes and
tion about reac- settings for local standards and guidelines are specified.
tive power mode However, in some situations it may be worthwhile to adapt the preset country-specific op-
erating modes and settings to the local grid situation.
This will help to ensure more reliable operation of the inverter in the grid, while enabling
the inverter to actively support the public grid. For this purpose, the grid voltage and grid
frequency must be within defined limits.
The voltage and frequency stability can be actively influenced by monitoring the effective
power and reactive power fed into the grid.
Simply decreasing the effective power in order to reduce high grid voltage levels usually
reduces the energy generated by the photovoltaic system in direct proportion.
One alternative is to switch the reactive power between the inverter and the grid. Even
though the reactive power is not consumed or converted into effective power and simply
oscillates between the inverter and the grid, the electricity fed in will increase.
Regardless of the active power and therefore regardless of the energy yield, switching the
reactive power can cause the voltage to both rise and to fall:
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Capacitive mode is shown on the inverter display by a positive sign +.
Inductive mode is shown on the inverter display by a negative sign -.
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In over-excited mode or capacitive mode, reactive power is supplied to the grid. The
grid voltage rises.
In under-excited mode or inductive mode, reactive power is taken from the inverter.
The grid voltage falls.