Harzig, Thibaut
(2019)
Improved Sequence Network for a Grid-Tied Current Controlled Inverter.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
The development of equipment for harvesting renewable energy has lead to an increase in the number of inverters connected to electric grid architectures. The power electronic inverter is a key element to interface most renewables with the grid. Often manufacturers will not provide the detailed schematics of the inverter control scheme that has been implemented. But, current control mode is one of the most common control strategies for inverter design.
The control design of such inverters is realized by assuming nominal operating conditions for the grid voltage. However, it is common to model a current-controlled inverter as a three-phase current source even under non-nominal conditions. Therefore, the classical fault analysis tools, such as symmetrical components, needs to consider unbalanced condition impacts on control to make an accurate estimation of the fault current expected from the power electronic unit. The contribution of this work is to study the behavior of a grid-tied current controlled inverter when the grid is experiencing a single line-to-ground fault and to analytically develop a sequence network model that takes into account the control strategy implemented and the nature of the fault. A PLECS simulation of a current controlled inverter is realized to prove that the new sequence network model, that takes into account the impact of the fault on the inverter’s control system behavior, is more representative of inverter behavior compared to a sequence network developed using classical assumptions.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
23 January 2019 |
| Date Type: |
Publication |
| Defense Date: |
19 November 2018 |
| Approval Date: |
23 January 2019 |
| Submission Date: |
28 November 2018 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
68 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Electrical Engineering |
| Degree: |
MSEE - Master of Science in Electrical Engineering |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Current Regulation, Grid-Tied Inverters, Symmetrical Components |
| Date Deposited: |
23 Jan 2019 16:15 |
| Last Modified: |
23 Jan 2019 16:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/35654 |
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