Efficient and seamless power management of hybrid generation system based-on DFIG wind sources and microturbine in DC microgrid

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The study system in this paper is an islanded DC-microgrid comprising DFIG wind turbines (WTs), microturbine and loads. The main focus of this paper is on local control strategies design for the DFIG-WTs and microturbine to obtain short time-scale coordination, seamless power management and proper load sharing between WTs in the study system. In this work, control strategies related to the DFIG-WTs are extracted and then modified by adding an auxiliary control block, known as wind power curtailment block (WPCB), that adjusts the WT reference power according to the local DC bus voltages. Hence, as long as there is sufficient load demand, the WTs inject available power to the microgrid. Once available wind power exceeds the load demand, WTs adaptively curtail the injected power and seamlessly track the varying load. Next, the control structure of the so-called WPCB is further modified to realize proper load sharing between different WTs. Hence, by using the improved control structure of each WT, not only the proper and seamless power management is realized, but also, the load power is appropriately shared between different WTs according to available wind power. At the end, theoretical results are verified by time-domain simulations in the Matlab-Simulink environment.
TidsskriftSustainable Energy, Grids and Networks
StatusUdgivet - sep. 2020

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