What does fault-ride-through mean for an HVDC system and how should the requirement be interpreted?
it is the capability of converters to stay operating in short periods of lower electric network voltage or through a fault (cf. voltage dip).
Djilani answered it. That is assuming the voltage dip would be very swift, so after a few more cycles or seconds, voltage will get back to normal so there is no need for these resources (say wind) to trip off the grid.
Low voltage ride-through also known as fault ride through (FRT) requirement states that the system should stay connected when the AC grid voltage is temporarily reduced due to a fault or large load change in the grid. The voltage may reduce in one, two or all three phases of the ac grid. Grid operators define low voltage ride-through (LVRT) requirement to maintain high availability, stability and to reduce the risk of voltage collapse.
Restraining the power delivered to the HVDC DC link during voltage sags is a key point in achieving LVRT requirements. LVRT-capable systems enrich overall system stability by injecting reactive power during system events.
Is there any standard to define the quality of power injection by the converter in case of fault ride through capability?, except the current limit for the converter what are the other obligations during the fault duration?
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