Five months later of the great blackout of April 28a preliminary report from the Technological Research Institute (IIT) of the Pontifical University Comillas has put the focus in an insufficient synchronous generation program in the peninsular south as a “fundamental cause” of the electric zero. The document, commissioned by Endesa and Iberdrola and sent to Entso-E, also questions operational maneuvers of Electrica de España (REE).
A “collapse due to overtension.” The report introduces this unpublished concept in Europe. A phenomenon in which the tension rises uncontrollably by disconnecting renewable generation that operates with constant power factor. According to IIT calculationsthe safety margin available on the 220 kV network was 1,019 MW, but the disconnections exceeded 1,600 MW.
Take into practice it would be when a renewable plant is disconnected, the tension rises. That increase causes new disconnections, which makes the tension rise more, in a vicious circle that ends in the collapse.As details the quotation note of Comillasthat cascade reaction is not precedents in the continent and shows that the simple verification that the tension is within the “is not enough” range to guarantee stability.
A fragile and little inertia network. The debate is not “renewable yes or no”, but how to adapt the network and how it operates in high renewable penetration scenarios. The Iit Identify four critical points:
- Little programmed synchronous generation: in Andalusia there was alone A combined cycle group On the way, when the usual were several.
- Weak Network: At 9:00 in the morning, 35% of the 400 kV network was disconnected in the central and south areas.
- Dopsy inertia: In Andalusia it fell to 1.3 seconds, 35% less than the 2 seconds recommended by Entso-e.
- Risky maneuvers: between 12:00 and 12:30, Ree He connected eleven lines additional to try to cushion the oscillations, but those operations further reduced the safety margin.
The chronology of a collapse announced. The government report had already described one morning with “Atypical volatility”. At 12:03 there was a first 0.6 Hz oscillation; At 12:19, another of 0.2 Hz but with a three -time amplitude. To stabilize, Ree reduced exports and connected lines that were disconnected. Far from improving the situation, the system tension increased. At 12:26, the operator reached order the start From a combined cycle center in Andalusia, but the coupling time was more than an hour and a half: there was no room. From 12:32 The chain reaction began. At 12:33:19, the Peninsula It was completely dark.
Shock of stories. Here it opens The crack between reports. The Government pointed to Ree in June for poor programming and a “insufficiency of dynamic tensions control capabilities.” Ree, in his own document, replied that there were several power plants that did not fulfill their obligation to absorb reactive energy, which aggravated the crisis. The electrical companies, meanwhile, denied any ruling and accused the government and ree of “opacity.”
The new IIT report adds to debate Reinforcing the thesis that a scheduled synchronous generation was missing and questioning the operational maneuvers of the system operator, although it emphasizes that the analysis has the endorsement of international experts such as Goran Anderson and Pier Luigi Mancarella.
And now what? The IIT recommends reviewing synchronous generation programming, strengthening tension control, using more predictive metrics and better coordinating all agents. The Government tried in July to approve A decree “antiapages” with sanctions, greater public control and more prominence for self -consumption, but the text shipwrecked in Congress.
In addition, the Iberian Peninsula remains an “energy island”, with only 3% interconnection with France, which amplifies any operational error. Therefore, Spain and Portugal They have pressured To Paris to accelerate interconnection runners, “fed up with promises without calendar.”
Closer and closer. Next Thursday, the European Network of Transmission Systems Operators (ENTSO-E) will publish your factual report with detailed chronology and the final technical data of the 28th. That document will be the basis on which Brussels and Member States discuss responsibilities and measures.
The story of the 28th is not yet closed. And the Comillas report has just reopened it with a clear message: the energy transition does not fail to be fast, but for do not reinforce the network and the rules at the same pace.
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