ANNEX IVSupplementary provisions
ANNEX IV Requirements for U-Q/Pmax-profile referred to in Article 20 0,65 Production (lag) Consumption (lead) 0,5 0,4 0,6 0,7 0,1 0,2 0,3 0 – 0,1 – 0,2 – 0,4 Q/Pmax – 0,6 – 0,5 – 0,3 Range of Q/Pmax Fixed outer envelope Voltage range Inner envelope 0,8 0,85 0,9 1,0 1,1 1,15 U [p.u.] Figure 5 : The diagram represents boundaries of a U-Q/Pmax-profile with U being the voltage at the connection points expressed by the ratio of its actual value to its reference 1 pu value in per unit, and Q/Pmax the ratio of the reactive power to the maximum HVDC active power transmission capacity. The position, size and shape of the inner envelope are indicative and shapes other than rectangular may be used within the inner envelope. For profile shapes other than rectangular, the voltage range represents the highest and lowest voltage points in this shape. Such a profile would not give rise to the full reactive power range being available across the range of steady-state voltages. Synchronous Area Maximum range of Q/Pmax Maximum range of steady-state Voltage level in PU Continental Europe 0,95 0,225 Nordic 0,95 0,15 Great Britain 0,95 0,225 Ireland and Northern Ireland 1,08 0,218 Baltic States 1,0 0,220 Table 6 : Parameters for the Inner Envelope in the Figure.