Investigation of Relevant Distribution System Representation With DG for Voltage Stability Margin Assessment

Bharati, Alok Kumar; Ajjarapu, Venkataramana

doi:10.1109/tpwrs.2019.2950132

Title: Investigation of Relevant Distribution System Representation With DG for Voltage Stability Margin Assessment

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Abstract

This paper emphasizes the importance of including unbalanced distribution systems for voltage stability studies in power systems. The paper aims to: discuss the various simulation methods for power system analysis; highlight the need for modeling unbalanced distribution system for accurate load margin assessment; demonstrate the influence of net-load unbalance (NLU) on voltage stability margin (VSM). We also share a T&D co-simulation interface with commercial power system solvers. The distribution system is evolving rapidly with high proliferation of distributed energy resources (DERs); these are not guaranteed to proliferate in a balanced manner and uncertainty resulting due to these DERs is well acknowledged. These uncertainties cannot be captured or visualized without representing the distribution system in detail along with the transmission system. We show the impact of proliferation of DERs in various 3-phase proportions on voltage stability margin through T&D co-simulation. We also study the impact of volt/VAR control on voltage stability margin. This analysis is only possible by representing the distribution system in detail through T&D co-simulation. In conclusion, higher percentage of net-load unbalance (NLU) in distribution system aggravates the voltage stability margin of the distribution system, which can further negatively influence the overall voltage stability margin of the system.

Authors:

^[1]; Ajjarapu, Venkataramana ^[1]

Iowa State Univ., Ames, IA (United States)

Publication Date:: Mon Oct 28 00:00:00 EDT 2019

Research Org.:: Iowa State Univ., Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Electricity (OE)

OSTI Identifier:: 1692378

Grant/Contract Number:: OE0000876

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Power Systems

Additional Journal Information:: Journal Volume: 35; Journal Issue: 3; Journal ID: ISSN 0885-8950

Publisher:: IEEE

Country of Publication:: United States

Language:: English

Subject:: 24 POWER TRANSMISSION AND DISTRIBUTION; T&D Co-Simulation; Voltage Stability Margin; VSM; Unbalanced Distribution System; Distributed Generation (DG); Equivalent Feeder Impedance; Net-Load Unbalance (NLU)

Citation Formats


                    Bharati, Alok Kumar, and Ajjarapu, Venkataramana. Investigation of Relevant Distribution System Representation With DG for Voltage Stability Margin Assessment.  United States: N. p., 2019. 
Web.  doi:10.1109/tpwrs.2019.2950132.

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                    Bharati, Alok Kumar, & Ajjarapu, Venkataramana. Investigation of Relevant Distribution System Representation With DG for Voltage Stability Margin Assessment.  United States.  https://doi.org/10.1109/tpwrs.2019.2950132

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                    Bharati, Alok Kumar, and Ajjarapu, Venkataramana. Mon .  
"Investigation of Relevant Distribution System Representation With DG for Voltage Stability Margin Assessment".  United States.  https://doi.org/10.1109/tpwrs.2019.2950132.  https://www.osti.gov/servlets/purl/1692378.

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@article{osti_1692378,

  title        = {Investigation of Relevant Distribution System Representation With DG for Voltage Stability Margin Assessment},

  author       = {Bharati, Alok Kumar and Ajjarapu, Venkataramana},

  abstractNote = {This paper emphasizes the importance of including unbalanced distribution systems for voltage stability studies in power systems. The paper aims to: discuss the various simulation methods for power system analysis; highlight the need for modeling unbalanced distribution system for accurate load margin assessment; demonstrate the influence of net-load unbalance (NLU) on voltage stability margin (VSM). We also share a T&D co-simulation interface with commercial power system solvers. The distribution system is evolving rapidly with high proliferation of distributed energy resources (DERs); these are not guaranteed to proliferate in a balanced manner and uncertainty resulting due to these DERs is well acknowledged. These uncertainties cannot be captured or visualized without representing the distribution system in detail along with the transmission system. We show the impact of proliferation of DERs in various 3-phase proportions on voltage stability margin through T&D co-simulation. We also study the impact of volt/VAR control on voltage stability margin. This analysis is only possible by representing the distribution system in detail through T&D co-simulation. In conclusion, higher percentage of net-load unbalance (NLU) in distribution system aggravates the voltage stability margin of the distribution system, which can further negatively influence the overall voltage stability margin of the system.},

  doi          = {10.1109/tpwrs.2019.2950132},

  journal      = {IEEE Transactions on Power Systems},

  number       = 3,

  volume       = 35,

  place        = {United States},

  year         = {Mon Oct 28 00:00:00 EDT 2019},

  month        = {Mon Oct 28 00:00:00 EDT 2019}

}

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