A novel multi-area distribution state estimation approach for active networks

Mohammad Gholami, Ali Abbaspour Tehrani-Fard, Matti Lehtonen*, Moein Moeini-Aghtaie, Mahmud Fotuhi-Firuzabad

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

This paper presents a hierarchically distributed algorithm for the execution of distribution state estimation function in active networks equipped with some phasor measurement units. The proposed algorithm employs voltage-based state estimation in rectangular form and is well-designed for large-scale active distribution networks. For this purpose, as the first step, the distribution network is supposed to be divided into some overlapped zones and local state estimations are executed in parallel for extracting operating states of these zones. Then, using coordinators in the feeders and the substation, the estimated local voltage profiles of all zones are coordinated with the local state estimation results of their neighboring zones. In this regard, each coordinator runs a state estimation process for the border buses (overlapped buses and buses with tie-lines) of its zones and based on the results for voltage phasor of border buses, the local voltage profiles in non-border buses of its zones are modified. The performance of the proposed algorithm is tested with an active distribution network, considering different combinations of operating conditions, network topologies, network decompositions, and measurement scenarios, and the results are presented and discussed.

Original languageEnglish
Article number1772
Number of pages19
JournalEnergies
Volume14
Issue number6
DOIs
Publication statusPublished - 23 Mar 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Active distribution networks
  • Decentralized control strategy
  • Multi-area state estimation
  • Phasor measurement units
  • Weighted least square

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