ONS points to failure in wind and solar plants as the cause of the blackout and should propose regulation

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Voltage control equipment did not act according to data provided by the plants. Power outages hit 25 states and the Federal District in August. The National Electric System Operator (ONS) pointed to failure in the performance of equipment in wind and solar plants as the main cause of the “domino effect” that led to the shutdown of transmission lines and the blackout on August 15. The data is contained in the draft disturbance analysis report (RAP), made available on Monday (25). The final version of the document must be delivered by October 17th. Quixadá II Substation, where the failure occurred and led to a national blackout, according to the Ministry of Mines and Energy Jackson Perigoso/Personal archive According to the ONS, the equipment should automatically compensate for the voltage drop caused by the shutdown of the Quixadá-Fortaleza II transmission line – the “zero event” of the blackout. However, official data on the functioning of the equipment provided by the plants did not correspond to their performance after the line was disconnected in Ceará. ‘Impossible to identify’ In the draft, the operator states that the difference in the data provided made it “impossible for the ONS to previously identify the risk of PPS action [Proteção de Perda de Sincronismo] caused by voltage collapse in part of the system” after the line was disconnected. PPS is one of the electrical system’s protections and acts to prevent the problem from spreading throughout the interconnected system. Thus, there was a cascade effect of disconnection of transmission lines that caused the blackout on August 15th, when 34.5% of electricity demand was interrupted. Measures taken In the document, the ONS states that it will propose to the National Electric Energy Agency (Aneel) the development of new procedures for sending and validating data by the plants. This measure would have the objective of “ensuring reliable reproduction of its performance in the field, both in the process of integrating new plants and throughout the entire life cycle”, states the ONS. The operator also requested that wind and solar plants send data and information about the generation parks, with detailed equipment documentation, simulation models and data validation. This must be done by January 2024. Report open to contributions Publication of the draft report is one of the steps prior to completing the analysis. At this stage, sector agents must send contributions. The ONS has until October 17th to complete the document. “The RAP that is being prepared is one of the most important in our history and will be fundamental for improving planning, operation, regulation and integration of new projects”, stated the general director of ONS, Luiz Carlos Ciocchi.

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