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The ongoing expansion of distributed generation connected to distribution networks may increase the possibility of unintentional islanding incidents. Traditionally, islanding, due to loss of mains condition, has been detected with active or passive methods based on local grid parameters. However, an inevitable drawback of them is a non-detection zone where the protection does not detect the islanding...
The microgrid concept has been closely investigated and implemented by numerous experts worldwide. The first part of this paper describes the principles of microgrid design, considering the operational concepts and requirements arising from participation in active network management. Over the last several years, efforts to standardize microgrids have been made, and it is in terms of these advances...
The amount of distributed generation (DG) connected to distribution networks is increasing. This can cause challenges for traditional protection of distribution networks due to bidirectional power flows, fault current contribution of DG units and grid code fault-ride-through (FRT) requirements. During the normal, parallel with utility grid, operation, the protection coordination may be compromised...
Microgrids can be defined as distribution systems with distributed generation (DG) units, energy storages and controllable loads. Microgrids are expected to form an essential part of future Smart Grids with self-healing feature. Most of the time microgrids will be operated normally parallel with utility grid. In addition to this microgrids have a special self-healing capability, because they can continue...
Microgrids can be defined as distribution systems with distributed generation (DG) units, energy storages and controllable loads. Microgrids are expected to form an essential part of future Smart Grids with self-healing feature. Most of the time microgrids will be operated normally parallel with utility grid. In addition to this microgrids have a special self-healing capability, because they can continue...
After microgrid transition from the normal operation to the islanded operation the system impedance changes considerably and it affects on the harmonic voltages of the microgrid. In this paper the voltage and current THD before and after islanding are studied with different microgrid configurations. Simulations are also made by applying negative sequence filtering in control system of converters to...
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