The inverter can provide reactive power based on a function of the entire size of the inverter, not just on the level of generation. So, if cloudy skies drop solar generation from 100 percent to 10%, the inverter can use the other 90% of its remaining capacity to supply reactive power support and enhance utility grid power quality.
To absorb reactive power, it will generate a voltage still in phase with the grid voltage but with a lower amplitude. Inverters generate reactive power by use of the freewheeling diodes on each of the power switches. The inductive nature of the load makes it want to draw current even after the power switch has been turned OFF.
A power inverter controls reactive power generation by adjusting the phase relationship between the output voltage and current. When the voltage leads the current, capacitive reactive power is generated, whereas if the current leads the voltage, inductive reactive power is produced.
Although it doesn’t perform any useful work, reactive power is crucial for the proper functioning of AC systems. In a power inverter, reactive power is generated when the inverter''s output voltage and current are out of phase, which is necessary to support the system''s voltage levels and maintain stability.
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