Uncertainty quantification in LV state estimation under high shares of flexible resources

Nils Müller*, Samuel Chevalier, Carsten Heinrich, Kai Heussen, Charalampos Ziras

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The ongoing electrification introduces new challenges to distribution system operators (DSOs). Controllable resources may simultaneously react to price signals, potentially leading to network violations. DSOs require reliable and accurate low-voltage state estimation (LVSE) to improve awareness and mitigate such events. However, the influence of flexibility activations on LVSE has not been addressed yet. It remains unclear if flexibility-induced uncertainty can be reliably quantified to enable robust DSO decision-making. In this work, uncertainty quantification in LVSE is systematically investigated for multiple scenarios of input information availability and flexibility usage, using real data. For that purpose, a Bayesian neural network (BNN) is compared to quantile regression. Results show that frequent flexibility activations can significantly deteriorate LVSE performance, unless secondary substation measurements are available. Moreover, it is demonstrated that the BNN captures flexibility-induced voltage drops by dynamically extending the prediction interval during activation periods, and that it improves interpretability regarding the cause of uncertainty.
Original languageEnglish
JournalElectric Power Systems Research
Volume212
Number of pages8
ISSN0378-7796
DOIs
Publication statusPublished - 2022

Keywords

  • Bayesian neural network
  • Low-voltage network
  • Quantile regression
  • State estimation
  • Uncertainty quantification

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