access icon free Coordinated voltage/var control in a hybrid AC/DC distribution network

© The Institution of Engineering and Technology
Received 16/03/2019, Accepted 03/01/2020, Revised 24/10/2019, Published 20/02/2020

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.

Inspec keywords: voltage regulators; distributed power generation; power generation control; power distribution control; on load tap changers; voltage control; power distribution reliability; distribution networks

Other keywords: distributed generators; HDN's VVC model; time 30.0 min; time 2.0 hour; voltage control devices; coordinated VVC scheme; power management model; system-wide coordination; modified IEEE 33 nodes distribution system validate; different control characteristics

Subjects: Optimisation techniques; Distribution networks; Power system control; Distributed power generation; Voltage control; Control of electric power systems; Reliability

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