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Improved Sequence Network for a Grid-Tied Current Controlled Inverter

Harzig, Thibaut (2019) Improved Sequence Network for a Grid-Tied Current Controlled Inverter. Master's Thesis, University of Pittsburgh. (Unpublished)

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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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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Harzig, ThibautTHH39@pitt.eduTHH39
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorGrainger, Brandonbmg10@pitt.eduBMG10
Committee MemberReed, Gregorygfr3@pitt.eduGFR3
Committee MemberKwasinski, Alexisakwasins@pitt.eduakwasins
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


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