Technical FAQs 4

Can maximum inverter power limit grid feed-in?

The values of „maximum inverter power“ have always positive sign. Therefore they only limit the charging values for grid setpoint. They cannot limit the negative values for grid feed in. Using Grid feed-in → Limit system feed-in instead, also cannot solve this problem.

How many kW can a PV inverter output?

Export to Grid: Up to 4kW can be sent back to the grid because of the export limit. This means: The inverter can handle this 5kW AC output perfectly. However, the PV array is generating 10kW, so we have:

How to provide voltage support in PV inverter?

To provide voltage support at the PCC, reactive power is injected into the grid under fault conditions as per the specified grid codes. As previously discussed, the simultaneous injection of peak active power from PVs and reactive power into the grid for voltage support can trigger the over current protection mechanism in PV inverter.

How is maximum exploitation of the inverter's capacity achieved?

It is clearly evident that maximum exploitation of the inverter’s capacity is achieved due to simultaneous injection of active and reactive power without curtailing the active power as shown in Fig. 8 d.

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Solar inverter power limit

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