Blackout

About: Blackout is a research topic. Over the lifetime, 2088 publications have been published within this topic receiving 30433 citations.

Estimating dynamic instability risk by measuring critical slowing down

Abstract: Cascading failures typically involve a wide variety of power system dynamic phenomena, including cascading transmission line overloads, generator tripping, voltage collapse and/or rotor dynamic instability. Metrics that estimate proximity to critical points with respect to any of these phenomena could be useful as indicators of cascading failure risk. With the growing deployment of phasor measurement units (PMUs) in power systems, there is a rapidly increasing quantity of high-resolution, time-synchronized phasor data available to operators. Information in these data that could be formed into metrics of proximity to critical transition could be valuable to system operators who need to make timely, and costly, decisions to avert large blackouts. This paper provides preliminary evidence that time-series data alone, without intricate network models, can signal a pending critical transition in power systems. Our method is based on identifying “critical slowing down” in time series data. Results from a single machine stochastic infinite bus model and the Western US blackout of 10 August 1996 illustrate the utility of the proposed method.

Service restoration of complex distribution system with distributed generation

Abstract: Taking into account the complex and the lack of load data of actual distribution system, this paper establishes a simplified model of distribution network based on the equivalent load which can reduce the calculation time and reflect the flow distribution of the distribution network. A service restoration program for complex distribution system with distributed generation is proposed. When serious failures result in large area power blackout, the best supply area of the island is determined when the distributed power supply capacity is known and DG switches to the islanding operation mode to maintain the power supply for the important load. Then the remaining network loss of power is restored based on heuristic rules and optimized with the improved branch-exchange algorithm to make the loss of power load and network loss as little as possible. At last, the simulation results of the example show that the method can effectively solve the problem of distribution network service restoration.

A smart power system restoration based on the merger of two different strategies

Abstract: Power System Restoration (PSR) is carried out after a partial or complete blackout of a network. Its objective is to restore the power system as quickly as possible while satisfying all the constraints previously defined by grid codes. Two main strategies are currently used worldwide. The “build-up” strategy sectionalises the power system affected by the blackout. This strategy creates small subsystems and then applies parallel power system restoration. On the other hand, the “build-down” strategy preserves the complete network structure and energises the skeleton of the system. The decision of which strategy is undertaken depends mainly on the network topology. As both strategies have their advantages, this paper proposes to merge these in order to be benefited by both and, therefore, obtain an improved PSR. The proposed methodology can improve the restoration process of large scale networks affected by a complete blackout. The proposed methodology is implemented and validated on the IEEE 118-bus test system. Results from these studies demonstrate the effectiveness of the method to restore the network quickly.

BWR Station Blackout: A RISMC Analysis Using RAVEN and RELAP5-3D

Abstract: The existing fleet of nuclear power plants is in the process of having its lifetime extended and having the power generated from these plants increased via power uprates and improved operations. In...