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Basic, stage 1, MicroGrids combine distributed generation, intelligent load control, and in many cases energy storage, to form a well-behaved aggregate load or generator. This allows more straight-forward and widespread integration of distributed generation. More advanced MicroGrids (stage 2) can further add the capability to isolate such small sections of the network and continue to operate them...
This paper demonstrates how combination of passive loads, local energy storage, and renewable energy generation (a so-called `Microgrid') can be coordinated. Specifically, the paper examines the extent to which allowing the Microgrid voltage to fluctuate can be used to reduce the rating of the storage units and hence the cost of the Microgrid. The impact of system parameters is assessed. Results of...
A MicroGrid is expected to operate both as a sub system connected to the main grid or as an islanded system. However the provision of fault currents, in an islanded MicroGrid consisting only of micro-generation interfaced with relatively low-current power electronics, is a serious system protection issue. This paper presents the novel concept of using the central energy storage system (flywheel) as...
The demand for electricity continues to grow globally and the fonnation of MicroGrids is becoming a potentially attractive option to meet the expanding energy demands. A MicroGrid consists of a cluster of micro sources, energy storage systems (e.g. flywheel) and loads, operating as a single controllable system. A MicroGrid can be operated both connected to the main grid or as an island and must maintain...
Under normal operating conditions, a microgrid (MG) is interconnected with the medium voltage (MV) network. However, planned or unplanned events like maintenance or faults in the MV network, respectively, may lead to MG islanding. In order to deal with islanded operation and even black start following a general blackout, an emergency operation mode must be envisaged. Two possible control strategies...
Microgrids are attracting substantial interest because they have the potential to increase the use of renewable generation and micro-CHP. They can also defer investment in distribution capital plant and can improve local power quality. However the primary operational requirement of power systems is that they must operate safely from a user point of view, even during contingencies. Yet electrical safety...
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