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Further facts about the system disturbance on 4.11.06

As UCTE communicated yesterday, a UCTE Investigation Committee was set up this morning and placed under the chairmanship of Gerard A. Maas (as Chairman of the UCTE Steering Committee) who will be assisted by three convenors (corresponding to the 3-fold split in the system). The task of the UCTE investigation Committee is to clarify the causes of the incident and identify possible additional measures to be taken to prevent such disturbances to occur again. Due to the fact that the disturbance had an impact on all UCTE TSOs, all UCTE members will participate in the investigation. The preliminary results of this investigation will be available by the end of November.

As UCTE communicated yesterday, a UCTE Investigation Committee was set up this morning and placed under the chairmanship of Gerard A. Maas (as Chairman of the UCTE Steering Committee) who will be assisted by three convenors (corresponding to the 3-fold split in the system). The task of the UCTE investigation Committee is to clarify the causes of the incident and identify possible additional measures to be taken to prevent such disturbances to occur again. Due to the fact that the disturbance had an impact on all UCTE TSOs, all UCTE members will participate in the investigation. The preliminary results of this investigation will be available by the end of November.

Situation before the disturbance:
On Saturday evening, around 22:00h, the consumption in the control area of E.ON Netz was about13500 MW. At the same time, the injected wind power amounted to 3300 MW. Due to transits, the lines towards West were already loaded. But this situation was in itself normal.


Sequence of events:
At 21:38h, both circuits of the 380-kV-line Conneforde-Diele were switched off in order to secure the passing of the Ems river by a ship. A routine simulation of the switching-off of the a.m. line was computed in advance and did... more [truncated due to possible copyright]  

As UCTE communicated yesterday, a UCTE Investigation Committee was set up this morning and placed under the chairmanship of Gerard A. Maas (as Chairman of the UCTE Steering Committee) who will be assisted by three convenors (corresponding to the 3-fold split in the system). The task of the UCTE investigation Committee is to clarify the causes of the incident and identify possible additional measures to be taken to prevent such disturbances to occur again. Due to the fact that the disturbance had an impact on all UCTE TSOs, all UCTE members will participate in the investigation. The preliminary results of this investigation will be available by the end of November.

Situation before the disturbance:
On Saturday evening, around 22:00h, the consumption in the control area of E.ON Netz was about13500 MW. At the same time, the injected wind power amounted to 3300 MW. Due to transits, the lines towards West were already loaded. But this situation was in itself normal.


Sequence of events:
At 21:38h, both circuits of the 380-kV-line Conneforde-Diele were switched off in order to secure the passing of the Ems river by a ship. A routine simulation of the switching-off of the a.m. line was computed in advance and did not bring up concerns about this switching maneuver. Following the switching-off of the said line, the energy flow was transferred to other lines in the South. This situation was still stable.

After some time, a higher load appeared on the E.ON Netz grid, especially on the line Wehrendorf-Landesbergen (East-Westphalia) between the transmission systems of RWE TSO and E.ON Netz. At 22:10h, the lines Wehrendorf-Landesbergen and Bechterdissen-Elsen tripped. This reaction of the system as well as the reason for the timing of the tripping has now to be analyzed together with the other TSO partners that are interconnected in the UCTE system.

Consequences:
Because of the tripping of the 2 a.m. high-voltage lines, further tie-lines were overloaded within seconds and tripped in cascade. This lead to a split of the European UCTE interconnected network into 3 islands with different frequencies (see our yesterday information). Since at this moment, the geographic generation power was no longer evenly spread over the system, the North-Eastern part of the system (after the split) had a generation surplus of approx. 6000 MW. It appears from today’s available data that both the Western and South-Eastern parts had on the contrary a lack of power. In order to re-establish the balance between generation and consumption, load-shedding (cut of power supply to industry and household customers) was performed as follows:

Country/TSO Load shed
Austria/APG 1500 MW
Belgium/Elia 800 MW
France/RTE 5200 MW
Germany/E.ON Netz 400 MW
Germany/RWE TSO 2000 MW
Italy/TERNA 1500 MW
Netherlands/TenneT 400 MW
Portugal/REN 500 MW
Spain/REE 1500 MW

Upon action of the transmission system operators, the European UCTE network was reconnected after 38 minutes and the customers were progressively supplied again.

 


Source: http://www.ucte.org/news/e_...

NOV 7 2006
https://www.windaction.org/posts/5650-further-facts-about-the-system-disturbance-on-4-11-06
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