General blackout in Italy Sunday September 28, 2003, h. 03:28:00

Corsi, S.; Sabelli, C.

doi:10.1109/pes.2004.1373162

Cited by 79 publications

(31 citation statements)

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“…Various reasons have been declared for these failures. Invalid design of traditional load shedding scheme depending only on the local measurement is one of the most important reasons initiating these blackouts [4].…”

Section: Introductionmentioning

confidence: 99%

Centralized Adaptive Under Frequency Load Shedding Schemes for Smart Grid Using Synchronous Phase Measurement Unit

Yang¹,

Cai²,

Jiang³

et al. 2013

Journal of Electrical Engineering and Technology

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-Under frequency load shedding (UFLS) is an effective way to prevent system blackout after a serious disturbance occurs in a power system. A novel centralized adaptive under frequency load shedding (AUFLS) scheme using the synchronous phase measurement unit (PMU) is proposed in this paper. Two main stages are consisted of in the developed technique. In the first stage, the active power deficit is estimated by using the simplest expression of the generator swing equation and static load model since the frequency, voltages and their rate of change can be obtained by means of measurements in real-time from various devices such as phase measurement units. In the second stage, the UFLS schemes are adapted to the estimated magnitude based on the presented model. The effectiveness of the proposed AUFLS scheme is investigated simulating different disturbance in IEEE 10-generator 39-bus New England test system.

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Section: Introductionmentioning

confidence: 99%

Centralized Adaptive Under Frequency Load Shedding Schemes for Smart Grid Using Synchronous Phase Measurement Unit

Yang¹,

Cai²,

Jiang³

et al. 2013

Journal of Electrical Engineering and Technology

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“…The so-called transient stability analysis is associated with the ability of a power grid to maintain synchronism when subjected to a large disturbance (Kundur 1994;Chiang 1999; IEEE/CIGRE Joint Task Force on Stability Terms and Definitions 2004). Loss of transient stability is recognized as one cause of large blackouts such as the September 2003 blackout in Italy (Corsi and Sabelli 2004;Andersson et al 2005). Transient stability is mainly governed by oscillations of relative rotor angles between different rotating machines in the short-term regime (0 to 10 seconds (Kundur 1994)) and is mathematically investigated by the so-called nonlinear swing equations (Kundur 1994;Chiang 1999).…”

Section: Introductionmentioning

confidence: 99%

Coherent Swing Instability of Power Grids

2011

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We interpret and explain a phenomenon in short-term swing dynamics of multi-machine power grids that we term the Coherent Swing Instability (CSI). This is an undesirable and emergent phenomenon of synchronous machines in a power grid, in which most of the machines in a sub-grid coherently lose synchronism with the rest of the grid after being subjected to a finite disturbance. We develop a minimal mathematical model of CSI for synchronous machines that are strongly coupled in a loop transmission network and weakly connected to the infinite bus. This model provides a dynamical origin of CSI: it is related to the escape from a potential well, or, more precisely, to exit across a separatrix in the dynamical system for the amplitude of the weak nonlinear mode that governs the collective motion of the machines. The linear oscillations between strongly coupled machines then act as perturbations on the nonlinear mode. Thus we reveal how the three different mode oscillations-local plant, inter-machine, and inter-area modes-interact to destabilize a power grid. Furthermore, we present a phenomenon of short-term swing dynamics in the New England (NE) 39-bus test system, which is a well-known benchmark model for power grid sta- bility studies. Using a partial linearization of the nonlinear swing equations and the proper orthonormal decomposition, we show that CSI occurs in the NE test system, because it is a dynamical system with a nonlinear mode that is weak relative to the linear oscillatory modes.

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“…Electricity grid can transmit power hundreds of thousands of kilometers away, but also can quickly spread the local failure to the whole [1][2]. Over the years several major power outages caused by cascading failures occurred, such as the blackout in North American power grid in 2003, the blackout in London, the blackout in Sweden-Denmark, and the blackout throughout Italy [3][4][5][6][7][8]. Blackouts are triggered mainly by cascading failure, which has two characteristics: 1) it starts from a component's cutoff, in turn causing other components' cutoff in succession, 2) the probability of the accident is small, but the harm it causes is great [9].…”

Section: Introductionmentioning

confidence: 99%

Probability analysis model and risk assessment of N-k contingency based on condition-based maintenance

Zhang

Chen

2011

2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

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Combining condition-based maintenance (CBM) with large-area power-failure, an N−k contingency on-line identification method based on CBM is proposed in this paper. According to real-time data of CBM, a failure possibility model for equipments is built, and the online searching and screening of N−k contingency path are implemented by use of the theory of functional group and modified searching approach; based on utility theory and monitoring results of CBM, risk assessment model of N-k contingency is established. Finally, the proposed method is realized by C++ language. Taking three substations in Anyang power grid for example, the correctness of the proposed method is verified.

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General blackout in Italy Sunday September 28, 2003, h. 03:28:00

Cited by 79 publications

References 0 publications

Centralized Adaptive Under Frequency Load Shedding Schemes for Smart Grid Using Synchronous Phase Measurement Unit

Centralized Adaptive Under Frequency Load Shedding Schemes for Smart Grid Using Synchronous Phase Measurement Unit

Coherent Swing Instability of Power Grids

Probability analysis model and risk assessment of N-k contingency based on condition-based maintenance

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