Print Email Facebook Twitter Control of a DC Microgrid Title Control of a DC Microgrid Author Sakkas, Sotiris (TU Delft Electrical Engineering, Mathematics and Computer Science) Contributor Ramirez Elizondo, L.M. (mentor) Bauer, P. (graduation committee) Rueda, José L. (graduation committee) Degree granting institution Delft University of Technology Programme Electrical Engineering | Sustainable Energy Technology Date 2018-11-27 Abstract The growth of distributed Renewable Energy share in the total electricity production as wells as technological advancements in power electronics and increase of DC loads, point towards the development of the DC microgrid (DCMG) concept as a valid model for future energy systems especially for operations and locations where the existing grid cannot satisfy.A DC microgrid consist of distributed sources, load and storage connected to a DC bus through converters. The two main issues in a DCMG operation is the power balance between supply and demand and its implementation through the interfacing converters, who in turn must be able to facilitate these operations. Many grid control strategies can be used but whatever the strategy may be, control is achieved through regulation of the DC bus voltage.In this thesis a decentralized primary controller is selected, analyzed and modelled for power balance operations in an islanded 48V-LVDC microgrid, consisting of a renewable energy source, an electronic load and storage capability. Control is achieved through dc bus voltage monitoring and control operations on the interfacing converters, based on predefined voltage set points. As an interfacing converter, a cascaded half bridge buck and boost converter is used and controlled. Two different control modes are implemented: buck operation for the start-up of the grid and a special constant frequency modulation for soft switching and increased efficiency of the converter.Furthermore, its use as multi-purpose converter, its low level control schemes and the co-operation with the high-grid level control are studied. Physical switching models are used to account for the real operation of the converter, when operating under higher level control, aiming at grid stability and optimal power flow. Subject DC-DC power convertersbidirectional converterDC MicrogridZVSDroop ControlDecentralized Control To reference this document use: http://resolver.tudelft.nl/uuid:761e65f6-115a-430d-b549-7e8be6aeee95 Part of collection Student theses Document type master thesis Rights © 2018 Sotiris Sakkas Files PDF Control_of_a_DC_Microgrid.pdf 8.75 MB Close viewer /islandora/object/uuid:761e65f6-115a-430d-b549-7e8be6aeee95/datastream/OBJ/view