Blackout

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

On-line overcurrent relays setting approach in distribution networks by implementing new adaptive protection algorithm

Abstract: In order to meet the ever increasing demand for power, the government has revised its targets in increasing power generation. For this purpose, installation of new equipment or utilization of Distributed Generation (DG) has been employed. In addition to changes in topology of power grid, the amplitude of the short circuit currents also can be affected due to these developments. In this condition, fixed setting for the protective relays cannot respond correctly. In order to prevent any miscoordination or mal-operation, relays have to be adaptively coordinated for a new system configuration to achieve correct fault clearance operation. In this paper, a reliable protection scheme is achieved by implementing the proposed adaptive protection algorithm. As results show, proposed new settings for the relays avoid the risk of unnecessary blackout for distribution network consumers. In addition, sensitive and reliable protection scheme is achieved by implementing the proposed adaptive algorithm.

Electrical system resilience: a forensic analysis of the blackout in Lancaster, UK

Abstract: Great Britain’s electricity network is undergoing a major transformation as it moves from a system based on burning fossil fuels in central power stations to one dominated by distributed renewable energy; this brings with it a new set of risks. In parallel, the move to electronic documentation and communication is increasing the dependence of society on an ‘always-on’ electricity supply. Assessing the level of dependence is difficult, as full-scale experimentation is not practicable and a desktop analysis of situations involving a large number of human interactions is unlikely to be representative. In December 2015, Storm Desmond resulted in a blackout affecting more than 100 000 people in Lancaster, UK. This provided a unique case study that allowed researchers to investigate how society responds to a widespread loss of the electricity supply.

Advanced Grid-Forming Control of HVDC Systems for Reliable Grid Restoration

Abstract: Grid restoration strategies as emergency response gain increased attendance that arise from fundamental changes inside electrical grids. Due to the integration of fluctuating energy sources, the reduction of installed inertia as well as natural disasters a blackout might occur. High-voltage direct current (HVDC) systems open new possibilities to use electrical energy from a far distance and break new ground during grid restoration process through reliable power energy sources. In grid-forming control mode special attention has to be paid on converter current limitation and handle unbalanced grid conditions.In this paper a dynamic protection integrated model predictive control (DPI-MPC) concept using a generalized state space representation of a grid-connected modular multilevel converter (MMC) is derived. It enables to reconstruct an AC-grid after a blackout utilizing a VSC-HVDC system. With this approach, it is possible to restore a balanced voltage system even under unbalanced grid conditions and ensure functional protection of the grid-forming unit. This concept guarantees a more safe and reliable restoration process, which is validated in EMT simulations using MATLAB/Simulink. The results demonstrate that DPI-MPC and HVDC systems go together in a natural way offering novel possibilities during grid restoration process.