Topic
Power-system protection
About: Power-system protection is a research topic. Over the lifetime, 6353 publications have been published within this topic receiving 117961 citations.
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30 Sep 2001
TL;DR: In this article, an integrated scheme for protecting and controlling series injection voltage source inverters used with electrical grid systems is presented, which uses a number of strategies to provide a continuous current path for current from the secondary winding of the injection transformer for both transient and longer-term fault conditions.
Abstract: This paper presents an integrated scheme for protecting and controlling series injection voltage source inverters used with electrical grid systems. The scheme uses a number of strategies to provide a continuous current path for current from the secondary winding of the injection transformer for both transient and longer-term fault conditions. These strategies can also be used to provide a current path during normal operation of the external AC system, facilitating startup and shutdown of the series injection system, as well as recovery from a fault. Both simulation and experimental confirmation of the integrated protection scheme are presented.
40 citations
27 Jul 2005
TL;DR: In this paper, an automated agent based reconfiguration scheme has been proposed for the DC zonal shipboard electrical system (SES), which can reconfigure the system following a disturbance in order to maintain the continuity of supply to loads.
Abstract: In this paper, an automated agent based reconfiguration scheme has been proposed for the DC zonal shipboard electrical system (SES). It is shown that the scheme can reconfigure the system following a disturbance in order to maintain the continuity of supply to loads. The paper identifies the main design issues, which include the number and location of the sectionalizers, primary and secondary DC bus configurations. The paper illustrates that with proper design, the automated reconfiguration can provide the expected performance with regards to continuity and quality of supply to loads.
40 citations
TL;DR: The main and backup electric power system for the Boeing 777 is comprised of two independent electrical systems, the main and the backup as discussed by the authors, and the main electric system includes two engine-driven integrated drive generators, a generator driven by the auxiliary power unit, three generator control units, and a bus power control unit.
Abstract: The electric power system for the Boeing 777 is comprised of two independent electrical systems, the main and the backup. The main electric system includes two engine-driven integrated drive generators, a generator driven by the auxiliary power unit, three generator control units, and a bus power control unit. The backup electric system includes two engine-drive generators and one integrated converter/control unit to provide the redundancy of electrical sources equivalent to a three-engine airplane. Automation of the system is achieved by the use of state-of-the-art, microprocessor-based control units that perform system control, protection, and built-in-test functions. Each control unit has redundant two-way communication through an ARINC 629 communication bus that requires significantly fewer discrete wires than similar systems, allowing considerable reduction of the interface circuits and reduction in weight. >
40 citations
01 Nov 2011
TL;DR: An overcurrent relay based protection scheme is proposed for a converter based DG connected radial feeder to operate either in grid-connected or islanded mode maximizing the DG benefits to customers.
Abstract: The disconnection of distributed generators (DGs) from a distribution network for every abnormal condition drastically reduces the DG benefits and system reliability when DG penetration level is high. The DGs can be used to supply the load demand in the absence of grid supply if DGs are allowed to operate in islanded mode. In this paper, protection issues associated with disconnection of DGs are addressed in the context of a radial distribution feeder. Protection strategies are proposed to allow islanded operation and to restore the system performing auto-reclosing maintaining as many DG connections as possible. An overcurrent relay based protection scheme is proposed for a converter based DG connected radial feeder to operate either in grid-connected or islanded mode maximizing the DG benefits to customers. Moreover, an effective method is proposed to restore the system with DGs using auto-reclosers. The proposals are verified through PSCAD simulation and MATLAB calculations.
40 citations
Book•
31 Jul 2012
TL;DR: In this article, the authors present a volume on electromagnetic transient phenomena in transformer and rotating machine windings for professionals in power system protection, insulation condition monitoring, and incipient fault diagnosis.
Abstract: Electromagnetic transient phenomena in transformers and rotating machines are complicated by their winding structures, with transient phenomena caused by either external events such as lightning, or by internal events such as switching operations and faults. Electromagnetic Transients in Transformer and Rotating Machine Windings explores relevant theoretical frameworks, the latest empirical research findings, and industry-approved techniques in this area. Written for professionals who want to improve their understanding of the electromagnetic transient phenomena in transformer and rotating machines windings, this research volume is also useful for university research students in power system protection, insulation condition monitoring, and incipient fault diagnosis.
40 citations