ANALYSIS OF NEGATIVE-SEQUENCE DIRECTIONAL ELEMENT FOR TYPE-IV WIND POWER PLANTS UNDER VARIOUS CONTROL METHODOLOGIES

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MUTHA, S. A. T. H. I. S. H. K. U. M. A. R. (2020). ANALYSIS OF NEGATIVE-SEQUENCE DIRECTIONAL ELEMENT FOR TYPE-IV WIND POWER PLANTS UNDER VARIOUS CONTROL METHODOLOGIES. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

Negative-sequence directional element operation depends on the magnitude and thephase angle of the negative-sequence current with respect to negative-sequence voltage.The directional element’s operation and simplicity of settings lies in the representationof sources with the passive elements in the negative-sequence network diagram.This is not always true for inverter-based resources (IBR) with control schemes thatvary from manufacturer to manufacturer. IBR offers specific fault current signaturebased on the control system and fault ride-through (FRT) conditions defined inthe control scheme. This thesis expounds negative-sequence currents for traditionalsources and how the negative-sequence directional element uses this behavior to decidethe fault direction. Then, a Type IV wind power plant (WPP) with three differentcontrol schemes, and an equivalent conventional source model developed in EMTPRV,are used to generate various faults data. These fault data are used to analyze thebehavior of the negative-sequence directional element, developed using the MATLABtool. This thesis also shows the similarities of the negative-sequence current of theGerman grid code-based control scheme with traditional sources during unbalancedfaults. Recommendations are then made in terms of additional requirements from theGerman grid code FRT and/or from the negative-sequence directional element logicto achieve improved dependability and security of the directional element.

Details
Author

MUTHA, SATHISH KUMAR

Title

ANALYSIS OF NEGATIVE-SEQUENCE DIRECTIONAL ELEMENT FOR TYPE-IV WIND POWER PLANTS UNDER VARIOUS CONTROL METHODOLOGIES

Physical Description

1 online resource (97 pages) : PDF

Date

2020

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

Negative-sequence directional element operation depends on the magnitude and thephase angle of the negative-sequence current with respect to negative-sequence voltage.The directional element’s operation and simplicity of settings lies in the representationof sources with the passive elements in the negative-sequence network diagram.This is not always true for inverter-based resources (IBR) with control schemes thatvary from manufacturer to manufacturer. IBR offers specific fault current signaturebased on the control system and fault ride-through (FRT) conditions defined inthe control scheme. This thesis expounds negative-sequence currents for traditionalsources and how the negative-sequence directional element uses this behavior to decidethe fault direction. Then, a Type IV wind power plant (WPP) with three differentcontrol schemes, and an equivalent conventional source model developed in EMTPRV,are used to generate various faults data. These fault data are used to analyze thebehavior of the negative-sequence directional element, developed using the MATLABtool. This thesis also shows the similarities of the negative-sequence current of theGerman grid code-based control scheme with traditional sources during unbalancedfaults. Recommendations are then made in terms of additional requirements from theGerman grid code FRT and/or from the negative-sequence directional element logicto achieve improved dependability and security of the directional element.

Genre

masters theses

Subjects--Topics

Electrical engineering

Degree

M.S.

Keywords

Fault Current Characteristics
Inverter Based Resources
Negative-Sequence Currents
Negative-Sequence Directional Element
Protection Challenges
Wind Turbine Generator

Subject Area

Electrical Engineering

Advisor(s)

CECCHI, VALENTINA

Committee Members

KAMALASADAN, SUKUMAR
MANJREKAR, MADHAV
SHRESTHA, ARUN

Degree Note

Thesis (M.S.)--University of North Carolina at Charlotte, 2020.

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Rights Holder Information

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Identifier

MUTHA_uncc_0694N_12532

Permalink

http://hdl.handle.net/20.500.13093/etd:1850