Open AccessCoordinated voltage/var control in a hybrid AC/DC distribution network
Author(s) -
Qiao Feng,
Ma Jin
Publication year - 2020
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2019.0390
Subject(s) - voltage , ac power , computer science , tap changer , electric power system , control theory (sociology) , capacitor , electronic engineering , power (physics) , engineering , electrical engineering , control (management) , artificial intelligence , physics , quantum mechanics , transformer
A hybrid AC/DC distribution network (HDN) is formed after multiple hybrid AC/DC microgrids (MGs) and distributed generators (DGs) are integrated into the distribution network. Voltage/var control (VVC) in this evolved system constitutes a big challenge to system operators as a large variety of voltage control devices with quite different control characteristics are expected to be co‐managed. This study proposes a coordinated VVC scheme to regulate voltage in an HDN by integrating power management model of hybrid AC/DC MGs into HDN's VVC model. The devices at HDN's level and those in MGs are allocated into two different models, and two models are linked via an approach called mathematical programmes with equilibrium constraints to achieve system‐wide coordination. In the proposed VVC, mechanical devices such on‐load‐tap changer (OLTC) and shunt capacitor (SC) are scheduled every 2 h to save their lifetime, while the electronically interfaced DGs and MGs are scheduled every 30 min to leverage their fast power support. Case studies on a modified IEEE 33 nodes distribution system validate that the proposed VVC can effectively coordinate MGs' power support with OLTC, SCs, and DGs, and it constitutes significant improvements on power loss reduction and voltage quality compared with traditional VVC.