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What causes voltage dips in a wind turbine?
They can be caused by switchgear opening or closing, atmospheric discharges, the removal of large loads, or the energizing of a capacitor bank. Such voltage swells can also be caused by wind farms themselves, as a result of wind turbine shutdowns and start-ups, capacitor bank connection, and so on.
Why are voltage dips bad for the DG system?
Voltage dips are often responsible for disrupting the operation of sensitive electronic components which is very frequent in DG system such as microgrid [70].
What is the reference voltage of a voltage dip?
A voltage dip (or sag) is a sudden reduction in the supply voltage on one or more phases to a value between 90% and 1% of the reference voltage followed by a voltage recovery shortly afterward. The reference voltage is the nominal voltage, the declared voltage, or the pre-dip voltage.
How long does it take for a voltage dip to occur?
Drops in voltage with duration of less than half a cycle cannot be characterized as a change in the effective value of the voltage and are considered transitory. The aforementioned Spanish regulation sets the upper limit at 1 min.
Last Update: Oct 2021