The European Network of Electricity Transportation Network Managers (ETSO-E) has advanced on Friday that the blackout of April 28 was due to a “complex sequence of events” and that two periods of tension and frequency oscillations were recorded in the electrical systems during the half hour prior to the incident.
The Association, in charge of independent European research About the incidentreported in a statement that in the half hour before the blackout, which occurred at 12.33 hours, two oscillations were recorded in terms of power and frequency between 12.03 and 12.07 and between 12.19 and 12.21.
«The transport network managers of Spain (Red Eléctrica) and France (RTE) took measures to mitigate these oscillations. At the time of the incident, There were no oscillations And the variables of the electrical system were within the normal operation range, ”explained Entso-E, which has found that Spain was exporting until then 1,000 megawatts (MW) to France, 2,000 MW A Portugal and 800 MW to Morocco.
The agency has indicated that the event began at 12:32:57 and that, in the subsequent 20 seconds, a “series of different generations of travel” were scored in southern Spain for about 2,200 MW.
«In Portugal and France, no generation trips were observed. As consequence of these incidentsthe frequency decreased and an increase in tension in Spain and Portugal is observed, ”he collects in this preliminary report.
Already between 12:33:18 and 12:33:21, the frequency in the Peninsula continued to fall to 48 Hercios, which activated contingency plans of both Spain and Portugal. In turn, the networks of alternating current between France and Spain They disconnected successfully before the loss of synchronicity.
Thus, at 12:33:24, the “complete collapse of the Iberian electrical system” and high voltage cables between France and Spain materialized, they also stopped transmitting energy.
Network restoration
Entso-E stressed that at 12.44, a 400 kV first line between western Spain and France was reactivated again, and that, and that, and that, and that, 20 minutes later, interconnection Between Morocco and Spain it was already operational.
-From the beginning of the restoration to approximately 13.30, several Spanish hydroelectric plants with “black start capacity” were launched to initiate the restoration of the system. At 13.35, the connection On the eastern flank of the Franco-Spanish border he was active again.
Also, at 16.11 and 17.26 Spanish peninsular time, the two electric plants of Portugal start -up In black they managed to restart after the “unsuccessful previous attempts.”
Then, the first 220 kV line between Spain and Portugal received again energy at 18.36 hoursaccelerating the restoration of the Portuguese system. In addition, at 9:35 p.m., it was the turn of the 400 kV connection that exists in the south of both countries.
Finally, the total recovery of the transmission system It was completed in Portugal at 00.22 hours of April 29 and in Spain about 04.00 of the same day.
The miteco sees good news the advance
For its part, the Ministry for Ecological Transition and the Demographic Challenge has considered a “good news” that has advanced in the analysis of the causes of the blackout and that have contributed Initial estimates of generation losses. In addition, “he has greeted” the designation of the panel of experts who will direct the independent investigation of Entso-E.
«Entso-E has moved that the causes of the crisis are complex and informs of two periods of voltage and frequency oscillations in European electrical systems during the half hour prior to the incident, which The TSO of Spain stabilize and France, ”sources from the Ministry have indicated to Europa Press.
Likewise, the department led by Sara Aagesen has reported that the Committee for Analysis From the crisis, whose working groups will continue working this weekend, will meet again next Monday.
«The Committee will analyze all the available elements and continue working with All operators To know with certainty the origin of the incident, ”they added.
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