Masters Theses
Abstract
"An approach to modeling externally controlled inverters in droop controlled microgrids is presented. A generic three-phase grid-tied inverter and control system model is derived in synchronous reference frame. The structure of this inverter is intended to be similar in composition to other three-phase inverters whose models and dynamics are well understood. This model is used as a starting point in the development of a more comprehensive model, which is capable of representing the coupling between complex power, bus voltage, and frequency that occurs in a microgrid. This new model is a combination of the generic inverter and an autonomous, grid-forming inverter with a local load. The accuracy of the new model is verified through comparisons of small-signal dynamic predictions, simulations, and experimental results from a microgrid testbed.
The proposed procedure of modifying an existing small-signal model for use in a microgrid system retains the information of the original model while successfully enabling the prediction of dynamic interactions with other generating units in the microgrid. The process is scalable for any number of inverters at the same point of connection, allowing accurate predictions of full system dynamics during distributed control actions, such as black start or grid-resynchronization. Traditional linear control techniques may be used to improve the performance and stability of the microgrid system. This is a demonstrated in an analysis of the system's eigenvalues. Drawing from the insights provided by this analysis, hardware and control parameters are selected to improve the response of the generic inverter"--Abstract, page iii.
Advisor(s)
Kimball, Jonathan W.
Committee Member(s)
Ferdowsi, Mehdi
Shamsi, Pourya
Department(s)
Electrical and Computer Engineering
Degree Name
M.S. in Electrical Engineering
Sponsor(s)
United States. Department of Energy
Publisher
Missouri University of Science and Technology
Publication Date
Fall 2014
Pagination
ix, 54 pages
Note about bibliography
Includes bibliographical references (pages 52-53).
Rights
© 2014 Jacob Andreas Mueller, All rights reserved.
Document Type
Thesis - Open Access
File Type
text
Language
English
Subject Headings
Distributed generation of electric power
Smart power grids
Power electronics
Thesis Number
T 10589
Electronic OCLC #
902735137
Recommended Citation
Mueller, Jacob Andreas, "Small-signal modeling of grid-supporting inverters in droop controlled microgrids" (2014). Masters Theses. 7335.
https://scholarsmine.mst.edu/masters_theses/7335