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Distributed generation (DG) technologies, such as wind turbines, fuel cells, and photovoltaic systems, are connected to a distribution system. A superconducting fault current limiter (SFCL) is also connected to a distribution system for fault current limitation. The connection of an SFCL causes protective coordination problems, especially for reclosing. In this work, a new reclosing algorithm is proposed...
Distributed generation (DG) technologies are emerging. Nevertheless, still no sufficient strategies for active grid integration of DG units and their participation in grid control are available. Including DG units into the control of the grid state variables and into secondary grid control, would enable a variety of additional features, specially supported by the decentralized character of the DG...
Distributed generation is increasingly likely to play a major role in electricity supply systems as recognition is made of its low carbon credentials. However, the integration of these units at distribution voltages is a major challenge for utilities. One particular issue is that generators may, unintentionally, continue to supply local demand when areas of the network are isolated from the main system...
This paper explores the potential future need for fault current limitation in the UK's power system, and some of the technical implications of this change. It is estimated that approximately 300–400 distribution substations will require fault current limitation, based on the statistical analysis of the projected fault level “headroom” (or violation). The analysis uses a UK electrical system scenario...
The installation of Distributed Generation (DG) imposes many challenges in the design of distribution systems; one of which is protection coordination. Distributed generation can affect the re-closer-fuse coordination which could lead to nuisance tripping and loss of power. In this paper, the re-closer fuse coordination problem is investigated and it is proposed to use a fault current limiter to mitigate...
Positive feedback anti-islanding controls are designed within the inverter controllers to facilitate the islanding detection for the inverter-based distributed generation (DG). These anti-islanding controls, however, can have influence on the dynamics of DG systems. This paper investigates the impact of the positive feedback anti-islanding controls on the small-signal stability of the grid-connected...
This paper reports on the importance of automation of power systems in reducing power downtime after faults. Traditionally power utilities used fault calls from customers to detect power outages. Following this maintenance team would be dispatched to the scene, to first identify the location of fault and then isolate the fault area through switching activities, effect repairs and then restore power...
A new fault location method for distribution automation of active network is presented. It compares the phase angle of fault currents at both ends of a feeder section when the fault current contribution of downstream distributed generation also exceeds overcurrent setting. The measurement of phase angle is synchronized by the fault itself, and the fault is detected by comparing the current deviation...
This paper deals with the concept development and laboratory testing of an adaptive protection system for distribution networks with distributed energy resources. Adaptation of protection relay settings according to currently available short-circuit current at respective grid nodes, is one solution to cope with the challenges originating from distributed generation. The challenges in conventional...
An effective introduction of distributed generation (DG) into existing distribution networks (DNs) calls for a review of traditional power system protection concepts and strategies. New issues such as activeness of DNs and bidirectional power flow require new protection solutions. This paper discusses protection issues and challenges arising from the integration of DG into the grid. It presents and...
Distributed generation (DG) is recently integrating conventional power systems to assist main power plants to satisfy customer need. A control hierarchy to interconnect DG systems to conventional power systems is required to improve reliability and quality of power supply systems. The main task is to control the frequency and voltage of the systems. This task is currently done by using synchronous...
Distributed generation offers the potential to maintain supplies to consumers during a system disturbance which results in the loss of grid connection. Although this is not permitted under current UK practice and there are complications from moving from a grid connected mode to an islanding mode, there are no fundamental reasons preventing their use for such a purpose should appropriate measures be...
During the last decade, the needs for exploitation of distributed generation (DG), including renewable energy such as photovoltaic, wind turbine, fuel cells, etc., has been growing. In spite of many economic and technical advantages of DG, high penetration of DG in distribution systems would cause some negative impacts on distribution network operation such as increase of fault current level, false...
In radial distribution systems, three step current protection, also called overcurrent protection, has been widely used for many years. When distributed generators (DGs) are connected to a radial distribution system, they will have some effects on the traditional overcurrent protection scheme and may lead to false tripping. This paper proposed a new communication supported fast current protection...
There are increasing uptaking of distributed generation in distribution networks in the UK due to the increased usage of renewable generations such as windfarms and biomass. Distribution networks were not designed for this purpose and there are concerns on the impact of the generator connection on network protection. This paper gives a brief review of the arrangements of network protection and auto...
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