Reactive power capability
Article 20
1. The relevant system operator, in coordination with the relevant TSO, shall specify the reactive power capability requirements at the connection points, in the context of varying voltage. The proposal for those requirements shall include a U-Q/P max -profile, within the boundary of which the HVDC converter station shall be capable of providing reactive power at its maximum HVDC active power transmission capacity. 2. The U-Q/P max -profile referred to in paragraph 1 shall comply with the following principles: (a) the U-Q/P max -profile shall not exceed the U-Q/P max -profile envelope represented by the inner envelope in the figure set out in Annex IV, and does not need to be rectangular; (b) the dimensions of the U-Q/P max -profile envelope shall respect the values established for each synchronous area in the table set out in Annex IV; and (c) the position of the U-Q/P max -profile envelope shall lie within the limits of the fixed outer envelope in the figure set out in Annex IV. 3. An HVDC system shall be capable of moving to any operating point within its U-Q/P max profile in timescales specified by the relevant system operator in coordination with the relevant TSO. 4. When operating at an active power output below the maximum HVDC active power transmission capacity (P < P max ), the HVDC converter station shall be capable of operating in every possible operating point, as specified by the relevant system operator in coordination with the relevant TSO and in accordance with the reactive power capability set out by the U-Q/P max profile specified in paragraphs 1 to 3.