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Title: Optimal Voltage Reference for Droop-Based DERs in Distribution Systems

Abstract

Due to the newly issued standards on distributed energy resources (DERs), the droop-based operation modes ( $${Q}$$ - $${V}$$ and $${P}$$ - $${V}$$ droops) become a requirement for all the interconnected DER units at the distribution level. Voltage references of the DER units can be assigned to improve the operational behavior of the distribution system in the smart grid context. This paper presents a novel formulation for optimally setting voltage reference of the droop-based DER units in distribution systems with the objective of minimizing the system ohmic loss. This problem is formulated as a mixed-integer quadratic convex optimization problem in MATLAB and solved by the MATLAB and CPLEX solvers. The IEEE 123-bus system and the EPRI test system Ckt5 are used to validate the proposed formulation. The result obtained from the proposed formulation is compared with the result of the original problem solved by the heuristic method. Based on the numerical study results, system loss can be reduced after the proposed voltage reference assignment. The computational expense of the new formulation is also much lower than that of the heuristic approach.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Electricity (OE)
OSTI Identifier:
1632821
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Smart Grid
Additional Journal Information:
Journal Volume: 11; Journal Issue: 3; Journal ID: ISSN 1949-3053
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Distributed energy resource integration; distribution system; droop operation; linear power flow; voltage reference assignment

Citation Formats

Hong, Tianqi, Zhao, Dongbo, Zhang, Yichen, Cui, Bai, and Tian, Yuting. Optimal Voltage Reference for Droop-Based DERs in Distribution Systems. United States: N. p., 2019. Web. https://doi.org/10.1109/TSG.2019.2953154.
Hong, Tianqi, Zhao, Dongbo, Zhang, Yichen, Cui, Bai, & Tian, Yuting. Optimal Voltage Reference for Droop-Based DERs in Distribution Systems. United States. https://doi.org/10.1109/TSG.2019.2953154
Hong, Tianqi, Zhao, Dongbo, Zhang, Yichen, Cui, Bai, and Tian, Yuting. Wed . "Optimal Voltage Reference for Droop-Based DERs in Distribution Systems". United States. https://doi.org/10.1109/TSG.2019.2953154. https://www.osti.gov/servlets/purl/1632821.
@article{osti_1632821,
title = {Optimal Voltage Reference for Droop-Based DERs in Distribution Systems},
author = {Hong, Tianqi and Zhao, Dongbo and Zhang, Yichen and Cui, Bai and Tian, Yuting},
abstractNote = {Due to the newly issued standards on distributed energy resources (DERs), the droop-based operation modes ( ${Q}$ - ${V}$ and ${P}$ - ${V}$ droops) become a requirement for all the interconnected DER units at the distribution level. Voltage references of the DER units can be assigned to improve the operational behavior of the distribution system in the smart grid context. This paper presents a novel formulation for optimally setting voltage reference of the droop-based DER units in distribution systems with the objective of minimizing the system ohmic loss. This problem is formulated as a mixed-integer quadratic convex optimization problem in MATLAB and solved by the MATLAB and CPLEX solvers. The IEEE 123-bus system and the EPRI test system Ckt5 are used to validate the proposed formulation. The result obtained from the proposed formulation is compared with the result of the original problem solved by the heuristic method. Based on the numerical study results, system loss can be reduced after the proposed voltage reference assignment. The computational expense of the new formulation is also much lower than that of the heuristic approach.},
doi = {10.1109/TSG.2019.2953154},
journal = {IEEE Transactions on Smart Grid},
number = 3,
volume = 11,
place = {United States},
year = {2019},
month = {11}
}

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