Novel Approaches in Modeling Integrated Power Transmission and Distribution System with Distributed Energy Resources and Controls

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Suresh, A. (2021). Novel Approaches in Modeling Integrated Power Transmission and Distribution System with Distributed Energy Resources and Controls. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

In recent years the grid modernization and rapid growth in distributed energy resourcesdue to environmental consciousness have resulted in distribution grids becoming more active which has led to significant interaction between transmission and distribution grids. In this dissertation, novel approaches in modeling and management tools are proposed considering integrated power transmission and distribution systems with Distributed Energy Resources (DERs). First, new power methods for power distribution system considering DERs is proposed in a single-phase, three-phase, and three sequence domain. Second, an integrated transmission and distribution (T&D) grid model where transmission and distribution systems are considered as a single unit is proposed. A coalescing Ybus approach is used to obtain the bus admittance matrix of the combined T&D system. Further, to successfully capture the effect of unbalances in the system at the same time reducing computational burden owing to the larger size, a three-sequence modeling framework is used for a unified system. A three-sequence-based multi-period power flow method is used to accurately capture the time-varying aspects of the system. Next, a three-sequence fault analysis method capable of conducting short circuit analysis on a DER integrated unbalanced distribution system is developed. All these sequence-based methods are then used for steady-state analysis of the integrated T&D system. Finally, a sensitivity-based coordinated voltage control scheme using reactive power support from DERs is proposed which can lead to reduced voltage regulator operations and tighter voltage profiles. The proposed methods have been validated using large-scale IEEE T&D feeders to prove the real-life implementation capabilities of the models and tools.

Details
Author

Suresh, Arun

Title

Novel Approaches in Modeling Integrated Power Transmission and Distribution System with Distributed Energy Resources and Controls

Physical Description

1 online resource (249 pages) : PDF

Date

2021

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

In recent years the grid modernization and rapid growth in distributed energy resourcesdue to environmental consciousness have resulted in distribution grids becoming more active which has led to significant interaction between transmission and distribution grids. In this dissertation, novel approaches in modeling and management tools are proposed considering integrated power transmission and distribution systems with Distributed Energy Resources (DERs). First, new power methods for power distribution system considering DERs is proposed in a single-phase, three-phase, and three sequence domain. Second, an integrated transmission and distribution (T&D) grid model where transmission and distribution systems are considered as a single unit is proposed. A coalescing Ybus approach is used to obtain the bus admittance matrix of the combined T&D system. Further, to successfully capture the effect of unbalances in the system at the same time reducing computational burden owing to the larger size, a three-sequence modeling framework is used for a unified system. A three-sequence-based multi-period power flow method is used to accurately capture the time-varying aspects of the system. Next, a three-sequence fault analysis method capable of conducting short circuit analysis on a DER integrated unbalanced distribution system is developed. All these sequence-based methods are then used for steady-state analysis of the integrated T&D system. Finally, a sensitivity-based coordinated voltage control scheme using reactive power support from DERs is proposed which can lead to reduced voltage regulator operations and tighter voltage profiles. The proposed methods have been validated using large-scale IEEE T&D feeders to prove the real-life implementation capabilities of the models and tools.

Genre

doctoral dissertations

Subjects--Topics

Electrical engineering

Degree

Ph.D.

Keywords

Distributed Energy Resources
Integrated Transmission And Distribution
Renewable Energy
Three-Sequence Modeling

Subject Area

Electrical Engineering

Advisor(s)

Kamalasadan, Sukumar

Committee Members

Kakad, Yogendra
Ebong, Abasifreke
Ozelkan, Ertunga

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2021.

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Rights Holder Information

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Identifier

Suresh_uncc_0694D_12958

Permalink

http://hdl.handle.net/20.500.13093/etd:2789