September 2022
Intermediate
416 pages
11h 39m
English
Content preview from Smart Hybrid AC/DC Microgrids
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8Smart Microgrid Control During Grid Disturbances
8.1 Introduction
During grid disturbances, the control of AC interfacing converters (IFCs), distributed generation (DG), energy storage systems (ESSs), and AC/DC grids, is critical to providing a reliable and stable operation for smart microgrids. The converters' operations under grid disturbances can be classified into two different groups when they are islanded from the upstream part of the electric power systems and interconnected to the power system upstream.
The islanding condition can be intentional and unintentional. In intentional islanding operation, a planned electrical island of microgrids capable of being energized by one or more DG sources is formed, and the transition to and from these islanded conditions and how different power sources should operate is planned. During unintentional islanding, IFCs should detect the island and cease to energize the system. This operation is now common practice for most grid‐connected DG under grid disturbances.
More recently, with the increasing connection of DG and ESSs and the consideration of their impact on the grid, grid disturbance ride‐through operation, where the IFCs are not disconnected from the grid under a short term disturbance, is getting more critical and is being considered for newer versions of grid codes. Unlike the intentional islanding microgrid operation, the power converters can ride‐through or trip (anti‐islanding) depending on the disturbance's duration ...
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