Three-Phase AC Optimal Power Flow Based Distribution Locational Marginal Price

Rui Yang, Yingchen Zhang

Research output: Contribution to conferencePaperpeer-review

22 Scopus Citations

Abstract

Designing market mechanisms for electricity distribution systems has been a hot topic due to the increased presence of smart loads and distributed energy resources (DERs) in distribution systems. The distribution locational marginal pricing (DLMP) methodology is one of the real-time pricing methods to enable such market mechanisms and provide economic incentives to active market participants. Determining the DLMP is challenging due to high power losses, the voltage volatility, and the phase imbalance in distribution systems. Existing DC Optimal Power Flow (OPF) approaches are unable to model power losses and the reactive power, while single-phase AC OPF methods cannot capture the phase imbalance. To address these challenges, in this paper, a three-phase AC OPF based approach is developed to define and calculate DLMP accurately. The DLMP is modeled as the marginal cost to serve an incremental unit of demand at a specific phase at a certain bus, and is calculated using the Lagrange multipliers in the three-phase AC OPF formulation. Extensive case studies have been conducted to understand the impact of system losses and the phase imbalance on DLMPs as well as the potential benefits of flexible resources.

Original languageAmerican English
Number of pages5
DOIs
StatePublished - 26 Oct 2017
Event2017 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2017 - Washington, United States
Duration: 23 Apr 201726 Apr 2017

Conference

Conference2017 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2017
Country/TerritoryUnited States
CityWashington
Period23/04/1726/04/17

Bibliographical note

See NREL/CP-5D00-68112 for preprint

NREL Publication Number

  • NREL/CP-5D00-71021

Keywords

  • distribution locational marginal price
  • optimal power flow

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