Vector Based Control for Power Electronics Dominated AC Power Grid

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dc.contributor.authorAshraf, Haris Binen
dc.contributor.committeechairZhang, Richarden
dc.contributor.committeememberBoroyevich, Dushanen
dc.contributor.committeememberFan, Boranen
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2025-02-15T09:00:10Zen
dc.date.available2025-02-15T09:00:10Zen
dc.date.issued2025-02-14en
dc.description.abstractThe global trend towards electrifying the grid has positioned power electronics at the forefront of modern power systems. To control power electronics in grid-connected applications, Grid Forming (GFM) control has become a focal point of research. GFM control utilizes control laws derived from steady-state relationships in the phasor domain. Although these control methods have historically performed well in traditional power systems dominated by electrical machines, they exhibit unexpected control issues in power electronics-dominant power systems. The root of these unexpected behaviors lies in the foundational assumptions of these control methods (Droop control and Virtual Synchronous Machine) i.e. frequency is considered to be a steady state quantity which is constant within the fundamental line cycle. This thesis critically examines these assumptions and elucidates their potential inapplicability in power electronics-dominated power systems. This thesis also introduces vectors as an alternative representation of voltages and currents. Unlike phasors, vectors are instantaneous and time-varying representation of electrical quantities at any point in time, defined by three time-varying values: Magnitude, Polar angle, and Azimuthal angle, using the spherical coordinate system. An initial attempt to demonstrate the capability of using these vectors to control the active and reactive power in inverters connected to the grid has also been presented in this thesis. The proposed vector-based control is able to track the commanded power setpoints within a fraction of the fundamental AC voltage cycle.en
dc.description.abstractgeneralAs the world moves towards cleaner, greener energy, power electronics have become a key technology in modern electrical grids. One of the main ways to control power converters in grid- connected systems is through a method called Grid Forming (GFM) control. GFM control has been effective in traditional grids with large rotating machines, but it faces unexpected problems in grids that rely more on power electronics. This is because the basic assumptions of GFM control, such as treating frequency as a steady value, do not always hold true in power electronics-driven systems. This thesis explores these issues and proposes a new approach to improve control. Instead of using traditional methods based on steady-state values, it introduces the idea of using vectors to represent electrical quantities like voltage and current. Unlike traditional methods, vectors can describe electrical signals at any moment in time. The thesis demonstrates how this vector-based approach can be used to control important parameters of power converters in the grid, like active and reactive power, in a way that responds quickly and accurately to changes and disturbances. This new method could help make power systems more reliable and efficient as they evolve to incorporate more power electronics.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:42450en
dc.identifier.urihttps://hdl.handle.net/10919/124584en
dc.language.isoenen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPower electronics in power systemsen
dc.subjectgrid integrationen
dc.subjectgrid forming controlen
dc.subjectinverter based resourcesen
dc.subjectrenewable energyen
dc.titleVector Based Control for Power Electronics Dominated AC Power Griden
dc.typeThesisen
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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