Operation of HVDC systems
Article 51
1. With regard to instrumentation for the operation, each HVDC converter unit of an HVDC system shall be equipped with an automatic controller capable of receiving instructions from the relevant system operator and from the relevant TSO. This automatic controller shall be capable of operating the HVDC converter units of the HVDC system in a coordinated way. The relevant system operator shall specify the automatic controller hierarchy per HVDC converter unit. 2. The automatic controller of the HVDC system referred to in paragraph 1 shall be capable of sending the following signal types to the relevant system operator: (a) operational signals, providing at least the following: (i) start-up signals; (ii) AC and DC voltage measurements; (iii) AC and DC current measurements; (iv) active and reactive power measurements on the AC side; (v) DC power measurements; (vi) HVDC converter unit level operation in a multi-pole type HVDC converter; (vii) elements and topology status; and (viii) FSM, LFSM-O and LFSM-U active power ranges. (b) alarm signals, providing at least the following: (i) emergency blocking; (ii) ramp blocking; (iii) fast active power reversal. 3. The automatic controller referred to in paragraph 1 shall be capable of receiving the following signal types from the relevant system operator: (a) operational signals, receiving at least the following: (i) start-up command; (ii) active power setpoints; (iii) frequency sensitive mode settings; (iv) reactive power, voltage or similar setpoints; (v) reactive power control modes; (vi) power oscillation damping control; and (vii) synthetic inertia. (b) alarm signals, receiving at least the following: (i) emergency blocking command; (ii) ramp blocking command; (iii) active power flow direction; and (iv) fast active power reversal command. 4. With regards to each signal, the relevant system operator may specify the quality of the supplied signal.