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ângulos de defasagem

English translation: Standing Phase Angle (SPA) differences

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Portuguese term or phrase:ângulos de defasagem
English translation:Standing Phase Angle (SPA) differences
Entered by: Isabella Kenfield
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16:31 Feb 19, 2012
Portuguese to English translations [PRO]
Tech/Engineering - Electronics / Elect Eng / electronic electricity meters
Portuguese term or phrase: ângulos de defasagem
Pagina fiscal: Diagrama Fasorial com informações dos valores de tensão e correntes, de forma trifásica, com os respectivos valores dos ângulos de defasagem entre as mesmas.
Isabella Kenfield
United States
Local time: 04:57
Standing Phase Angle (SPA) differences
Explanation:
http://onlinelibrary.wiley.com/doi/10.1002/etep.4450120408/a...

Abstract
During power system restoration, it is necessary to check the phase angle between two buses before closing circuit breakers to connect a line between them. These angles may occur across a tie line between two systems or between two connected subsystems within a system. In case of large Standing Phase Angle (SPA) difference the synchro-check relay does not allow closing of the breaker for this line. Therefore, this excessive SPA has to be reduced before attempting to connect the line. In this paper a new and fast method for reducing SPA is presented. For this purpose, the standing phase angle difference between two specific buses is represented in terms of sensitivity factors associated with the change in active power generations and consumption at the buses. Then, the proposed method reschedule generation of selected units or shed load of selected buses to reduce excessive SPA difference between two buses based on sensitivity factors.

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A formulação do equilíbrio completo do sistema é então estendida de forma a permitir o controle da defasagem angular entre duas barras do sistema através do redespacho de potência ativa para o fechamento em anel do sistema. Para melhorar o desempenho da
metodologia proposta, é descrito um procedimento para determinar os fatores de sensibilidades dos geradores baseados no vetor tangente do sistema.

The total system equilibrium is also used to control the standing phase angle difference between two buses of the system using the active power redispatch. This is done in order to deal with the system loop closure problem. To improve the approach performance, a method to compute sensibility factor of generators using the tangent vector is described.
Selected response from:

Gilmar Fernandes
United States
Local time: 04:57
Grading comment
4 KudoZ points were awarded for this answer

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Summary of answers provided
4Standing Phase Angle (SPA) differences
Gilmar Fernandes


  

Answers


2 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
Standing Phase Angle (SPA) differences


Explanation:
http://onlinelibrary.wiley.com/doi/10.1002/etep.4450120408/a...

Abstract
During power system restoration, it is necessary to check the phase angle between two buses before closing circuit breakers to connect a line between them. These angles may occur across a tie line between two systems or between two connected subsystems within a system. In case of large Standing Phase Angle (SPA) difference the synchro-check relay does not allow closing of the breaker for this line. Therefore, this excessive SPA has to be reduced before attempting to connect the line. In this paper a new and fast method for reducing SPA is presented. For this purpose, the standing phase angle difference between two specific buses is represented in terms of sensitivity factors associated with the change in active power generations and consumption at the buses. Then, the proposed method reschedule generation of selected units or shed load of selected buses to reduce excessive SPA difference between two buses based on sensitivity factors.

------------------------------
A formulação do equilíbrio completo do sistema é então estendida de forma a permitir o controle da defasagem angular entre duas barras do sistema através do redespacho de potência ativa para o fechamento em anel do sistema. Para melhorar o desempenho da
metodologia proposta, é descrito um procedimento para determinar os fatores de sensibilidades dos geradores baseados no vetor tangente do sistema.

The total system equilibrium is also used to control the standing phase angle difference between two buses of the system using the active power redispatch. This is done in order to deal with the system loop closure problem. To improve the approach performance, a method to compute sensibility factor of generators using the tangent vector is described.

Gilmar Fernandes
United States
Local time: 04:57
Works in field
Native speaker of: Native in PortuguesePortuguese, Native in EnglishEnglish
PRO pts in category: 95
Notes to answerer
Asker: Thanks Gilmar!

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