The recent advancement in DC microgrid is attributable to the emerging technologies developed on distributed renewables power generation and storage. Power electronic converters act as an interface in integrating large scale renewable energy sources and energy storage systems to DC microgrid, enabling in either utility grid connected mode or in islanded mode. However, the inertia of an islanded DC microgrid is lower compared to a utility grid connected DC microgrid, mainly due to the full dependency on renewable energy sources for power generation, the absence of inertia supported by synchronous generators, and the low inertia of power electronic converters. Consequently, DC bus voltage fluctuation is severe during transient power variations caused by the intermittent renewable energy sources and dynamic loading. In this work, a new power management methodology integrating three control modes, based on distributed virtual inertia enhancement control method, is proposed for maintaining the stability of DC bus voltage of an islanded DC microgrid. The proposed idea helps in providing instant inertia support to the system through distributed virtual DC-link capacitors, i.e., without implementing any physical components, which is a cost-free and space saving approach. The generated power, load power requirement, and battery state-of-charge information of the energy storage system are utilized to implement different control modes. A MATLAB simulation model of the system has been developed for preliminary verification. It is observed that the DC bus voltage fluctuation could be dramatically reduced to ≤ 0.7% of nominal value with the proposed method.
A Distributed Virtual Inertia Enhancement Control of an Islanded DC Microgrid
10.10.2024
841078 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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