Article 73U.K.Compliance simulations for HVDC systems
1.Equipment certificates may be used instead of part of the simulations below, on the condition that they are provided to the relevant system operator.
2.With regard to the fast fault current injection simulation:
(a)the HVDC converter unit owner or the HVDC converter station owner shall simulate fast fault current injection in the conditions set forth in Article 19;
(b)the simulation is deemed passed, provided that compliance with the requirements specified in accordance with Article 19 is demonstrated.
3.With regard to the fault-ride-through capability simulation:
(a)the HVDC system owner shall simulate the capability for fault-ride-through in the conditions set forth in Article 25; and
(b)the simulation is deemed passed, provided that compliance with the requirements specified in accordance with Article 25 is demonstrated.
4.With regard to the post fault active power recovery simulation:
(a)the HVDC system owner shall simulate the capability for post fault active power recovery in the conditions set forth in Article 26;
(b)the simulation is deemed passed, provided that compliance with the requirements specified in accordance with Article 26 is demonstrated.
5.With regard to the reactive power capability simulation:
(a)the HVDC converter unit owner or the HVDC converter station owner shall simulate the capability for leading and lagging reactive power capability in the conditions referred to in Article 20(2) to (4);
(b)the simulation shall be deemed passed, provided that the following conditions are cumulatively fulfilled:
the simulation model of the HVDC converter unit or the HVDC converter station is validated against the compliance tests for reactive power capability as referred to in Article 71;
compliance with the requirements as referred to in Article 20(2) to (4) is demonstrated.
6.With regard to the power oscillations damping control simulation:
(a)the HVDC system owner shall demonstrate the performance of its control system (POD function) to damp power oscillations in the conditions set forth in Article 30;
(b)the tuning shall result in improved damping of corresponding active power response of the HVDC system in combination with the POD function compared to the active power response of the HVDC system without POD;
(c)the simulation shall be deemed passed, provided that the following conditions are cumulatively fulfilled:
the POD function damps the existing power oscillations of the HVDC system within a frequency range specified by the relevant TSO. This frequency range shall include the local mode frequency of the HVDC system and the expected network oscillations; and
a change of active power transfer of the HVDC system as specified by the relevant TSO does not lead to undamped oscillations in active or reactive power of the HVDC system.
7.With regard to the simulation of active power modification in case of disturbance:
(a)the HVDC system owner shall simulate the capability to quickly modify active power according to Article 13(1)(b); and
(b)the simulation shall be deemed passed, provided that the following conditions are cumulatively fulfilled:
the HVDC system has demonstrated stable operation when following the pre-specified sequence of active power variation;
the initial delay of the adjustment of the active power is shorter than the value specified in Article 13(1)(b) or reasonably justified if greater.
8.With regard to the fast active power reversal simulation, as applicable:
(a)the HVDC system owner shall simulate the capability to quickly reverse active power according to Article 13(1)(c);
(b)the simulation shall be deemed passed, provided that the following conditions are cumulatively fulfilled:
the HVDC system has demonstrated stable operation;
the time of adjustment of the active power is shorter than the value specified in Article 13(1)(c) or reasonably justified if greater.