Abstract
DC–DC interlinking converters (ILCs) allow bidirectional energy exchange between DC buses of different voltage levels in microgrids. This paper introduces a multimode control approach of a half-bridge DC–DC converter interlinking an extra-low-voltage DC (ELVDC) bus of 48 VDC and a low-voltage DC (LVDC) bus of 240 VDC within a hybrid microgrid. By using the proposed control, the converter can transfer power between the buses when the other converters regulate them, or it can ensure the voltage regulation of one of the buses, this originating from its three operation modes. The proposed control scheme is very simple and provides a uniform system response despite the dependence of the converter dynamic on the operating point and the selected mode. Simulation and experimental results validated the theoretical development and demonstrated the usefulness of the proposed scheme.
Highlights
Suitable interconnection of power sources, storage elements, and loads in autonomous power systems is today a fundamental motivation in the development of power electronic converters.The concept of the microgrid has emerged because it can provide a more reliable, scalable, and flexible way to integrate these elements, generating research efforts to optimize their performance and develop their maximal functionality
Hybrid microgrids are able to interconnect elements in both DC and AC, which is the more standard version of a microgrid because majority of the known electrical sources and loads can be integrated into the same structure [1,2]
S after the penetration of theAs disturbances, showing voltage deviations lower than 5% ofofthe sELVDC
Summary
Suitable interconnection of power sources, storage elements, and loads in autonomous power systems is today a fundamental motivation in the development of power electronic converters.The concept of the microgrid has emerged because it can provide a more reliable, scalable, and flexible way to integrate these elements, generating research efforts to optimize their performance and develop their maximal functionality. More accepted proposals to control microgrids are related to a hierarchical management of the system that distinguishes layers or levels, which allows for optimization of several indicators of the microgrid, such as efficiency, power quality, and lifetime [5,6]. To accomplish these control objectives, some of the conversion stages of the microgrid must regulate the voltage of the DC buses, and others must ensure the interchange of power at the AC side, regulating either current or voltage and frequency
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