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Universal and Seamless control of Distributed Resources‎ (Patent Application No. GB1612350.7‎) / Meghdad Fazeli

Swansea University Author: Fazeli, Meghdad

Abstract

This patent proposes one control paradigm for microgrids that can operate in ‎both grid-connected and islanded modes, hence, does not need ‎any sort of islanding detection method. The proposed method ‎automatically and seamlessly rides-through a fault on the grid ‎side, and controls the microgrid’s...

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URI: https://cronfa.swan.ac.uk/Record/cronfa29757
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Abstract: This patent proposes one control paradigm for microgrids that can operate in ‎both grid-connected and islanded modes, hence, does not need ‎any sort of islanding detection method. The proposed method ‎automatically and seamlessly rides-through a fault on the grid ‎side, and controls the microgrid’s voltage and frequency during ‎islanded operation. During islanded operation it utilises the ‎combination of distributed generation-energy storage similar to ‎the prime-mover of a synchronous generator to control ‎frequency. A comprehensive active and reactive power control is ‎proposed that minimises the usage of a local fossil-fuelled ‎auxiliary generator. The method is based on expanding the so ‎called non-detection zone to all operational scenarios including ‎islanded mode, hence, having small, “undetectable” voltage and ‎frequency deviation. As soon as the grid is reconnected the ‎distributed generator is automatically and seamlessly ‎synchronised with the gird. This is achieved through keeping ‎PLL as part of the operation in islanded mode without altering its ‎phase angle.
College: College of Engineering