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Le délestage optimal pour la prévention des grandes pannes d'électricité

Abstract : With the spread of deregulation, power systems are operated more and more close to their security and stability limits, and system conditions have become increasingly complex. Under this situation, blackouts occur more often, and large-scale blackouts cause enormous economic losses and social problems. Firstly, we analyze 37 important blackouts in the world from 1965 to 2005. And we classify their features in each phase, summarize their mechanism and give some recommendations for preventing the future blackouts. From the analysis, cascade overload and voltage collapse are the major incidents in the blackouts and a real-time system to prevent the blackouts is necessary. Based on the new measurement and control technologies – Wide-area measurement system (WAMS), we propose a new real-time power system stability control system. This system could provide the optimal real-time solutions based on load shedding to prevent the system instability. Load shedding, an effective method to prevent blackouts, has been widely used in power systems. Previous load-shedding plans were usually prearranged with the estimation of the system's emergency condition. However, sometimes, predesigned load shedding could not prevent blackouts in the complex and non-forecasted system conditions. We propose three real-time optimal load shedding methods and the optimal strategies which focus on the real-time non-forecasted system situation and realize both voltage stability and transient stability after load shedding. The smart home system is a system which could control the energy and keep comfort in the house at the same time. The soft load shedding, which is based on the smart home system, could realize the load shedding without switching the customer supply off. The concept of soft load shedding is then completely different from the classic load shedding.
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Submitted on : Monday, July 20, 2009 - 4:37:15 PM
Last modification on : Thursday, November 19, 2020 - 1:00:05 PM
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Wei Lu. Le délestage optimal pour la prévention des grandes pannes d'électricité. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Grenoble - INPG, 2009. Français. ⟨tel-00405654⟩

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