Abstract
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.
Highlights
Because of the urgent need for a clean environment, the electricity sector is rapidly moving toward renewable energy utilization
To evaluate the effectiveness of the proposed work, wind energy conversion system (WECS)-based MG shown in Figure 1 is modeled in the MATLAB/Simulink environment
This paper presented an investigation into the modeling of an enhanced control stand on the two-stage hierarchical structure for WECS-based MG
Summary
Because of the urgent need for a clean environment, the electricity sector is rapidly moving toward renewable energy utilization. Based on the above-described background, different methodologies for parallel DGs forming an MG have been proposed for both autonomous and grid-tied modes [7,8,9] Decentralized control, such as droop control, has been utilized widely because of its simplicity and the lack of requirement for high-bandwidth communications [10]. The primary stage was set to address active power management while the secondary stage was set to compensate the deviations in voltage and frequency with the aid of high-bandwidth communication.
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