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Enhanced Two-Stage Hierarchical Control for a Dual Mode WECS-Based Microgrid

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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Energies 2018, 11(5), 1270; https://doi.org/10.3390/en11051270
Received: 28 March 2018 / Revised: 10 May 2018 / Accepted: 11 May 2018 / Published: 16 May 2018
(This article belongs to the Section Electrical Power and Energy System)
Along with the great benefits of utilizing renewable energy (e.g., wind energy) in the power system, there are also some issues, such as increasing the uncertainty and reducing the system inertia. Communication-based centralized control has started to play a significant role in reacting to the aforementioned issues, especially for relatively small systems, such as microgrids. In this context, in this paper, an enhanced communication-based hierarchical control for a dual mode wind energy conversion system-based microgrid is modeled and investigated. The primary stage utilized the P-V/Q-f droop method, which is the preferred droop method to be used in microgrids when the line impedance is mainly resistive. The secondary stage relied on an enhanced methodology for compensating the deviations of voltage and frequency and improving the performance of the microgrid during small and large signal disturbances. Moreover, as this microgrid operates in a dual mode, the mode transition cases from grid-tied mode to autonomous mode and vice versa have been addressed. Thereafter, an improved control scheme for the unplanned outage transition and a modified control scheme for the pre-synchronization and reconnection transition were proposed. Finally, the proposed work was evaluated by the simulation results in MATLAB environment. View Full-Text
Keywords: microgrid; hierarchical control; wind energy conversion system; dual operating mode microgrid; hierarchical control; wind energy conversion system; dual operating mode
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Imran, R.M.; Wang, S. Enhanced Two-Stage Hierarchical Control for a Dual Mode WECS-Based Microgrid. Energies 2018, 11, 1270.

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