Each subsystem shall have at least 2/3 of the frequency controlled normal operation reserve in its own system for potential splitting up and island operation. The following example (for 2013) shows how the division of power for the frequency controlled normal operation reserve takes place: Annual Frequency consumption controlled normal 2013 operation reserve (TWh) (MW) Eastern Denmark 13.7 22 Finland 85.2 138 Norway 130.0 210 Sweden 142.5 230 Synchronous system 371.4 600 4.1.2 Frequency controlled disturbance reserve There shall be a frequency controlled disturbance reserve of such a volume and composition that a dimensioning fault does not cause a frequency below 49.5 Hz in the synchronous system. With regard to the frequency-dependence of consumption, the above requirement entails that the total frequency controlled disturbance reserve shall rise to a power which is equal to the dimensioning fault deducted by 200 MW. It must be able to utilise the frequency controlled disturbance reserve until the fast active disturbance reserve is activated. The activation of the frequency controlled disturbance reserve shall not result in other problems in the power system. When the transmission capacity is being determined, the location of the frequency controlled disturbance reserve shall be taken into account. Each subsystem shall have at least 2/3 of the frequency controlled disturbance reserve in its own system for potential splitting up and island operation. The frequency controlled disturbance reserve shall be activated at 49.9 Hz and shall be fully activated at 49.5 Hz. It shall increase virtually linearly within a frequency range of 49.9-49.5 Hz. Agreed automatic load shedding, e.g. industrial, district heating and electric boiler consumption in the event of frequency drops to 49.5 Hz can be counted as part of the frequency controlled disturbance reserve. The following requirements are applicable, however:
Each subsystem shall have at least 2/3 of the frequency controlled normal operation reserve in its own system for potential splitting up and island operation. The following example (for 2013) shows how the division of power for the frequency controlled normal operation reserve takes place: Annual consumption 2013 (TWh) Frequency controlled normal operation reserve (MW) Eastern Denmark 13.7 22 Finland 85.2 138 Norway 130.0 210 Sweden 142.5 230 Synchronous system 371.4 600 4.1.2 Frequency controlled disturbance reserve There shall be a frequency controlled disturbance reserve of such a volume and composition that a dimensioning fault does not cause a frequency below 49.5 Hz in the synchronous system. With regard to the frequency-dependence of consumption, the above requirement entails that the total frequency controlled disturbance reserve shall rise to a power which is equal to the dimensioning fault deducted by 200 MW. It must be able to utilise the frequency controlled disturbance reserve until the fast active disturbance reserve is activated. The activation of the frequency controlled disturbance reserve shall not result in other problems in the power system. When the transmission capacity is being determined, the location of the frequency controlled disturbance reserve shall be taken into account. Each subsystem shall have at least 2/3 of the frequency controlled disturbance reserve in its own system for potential splitting up and island operation. The frequency controlled disturbance reserve shall be activated at 49.9 Hz and shall be fully activated at 49.5 Hz. It shall increase virtually linearly within a frequency range of 49.9-49.5 Hz. Agreed automatic load shedding, e.g. industrial, district heating and electric boiler consumption in the event of frequency drops to 49.5 Hz can be counted as part of the frequency controlled disturbance reserve. The following requirements are applicable, however:
System-Operation-Agreement-appendices-English-2016-update.docx