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access icon openaccess Coordinating voltage regulation for an AC–DC hybrid distribution network with multiple SSTs

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 23/08/2018, Accepted 19/09/2018, Published 23/10/2018

The increasing penetration of renewable generation and large implementation of the DC loads are challenges that stress the current distribution systems by causing uncertain voltage variations. The AC−DC hybrid distribution network is seen as an innovative solution to address the problem of accommodating highly dispersed sustainable energy. Specifically, the solid-state transformer (SST), which is capable of enhancing power-quality performance and controllability of the power distribution, has attracted increasing focus in this decade as a promising advanced converter. It is of great interest to investigate how to operate the multiple SSTs with different modes in a coordinated manner to optimise the distribution network performance. This paper formulates the coordinated operation model for multiple SSTs to enable fast voltage regulation for the hybrid active distribution network equipped with large-scale penetration of invertor-based solar power and DC load. A hybrid optimal power flow describing the controlling modes of SSTs and operating interaction between AC−DC subsystems is proposed in this paper. The case studies on a modified IEEE 33-AC−DC hybrid power distribution system show that the voltage profile can be optimised by using the flexible controlling resource of SSTs, facilitating the timely performance adjustment in the presence of fast fluctuating distributed generator's output.

Inspec keywords: power supply quality; controllability; invertors; voltage control; power transformers; load flow; power distribution control

Other keywords: dispersed sustainable energy; coordinated operation model; multiple SSTs; fast voltage regulation; distribution network performance; fast fluctuating distributed generator output; AC−DC hybrid distribution network; modified IEEE 33-AC−DC hybrid power distribution system; controllability; renewable generation penetration; invertor-based solar power penetration; current distribution systems; hybrid optimal power flow; AC−DC subsystems; uncertain voltage variations; DC load; power-quality performance enhancement; voltage profile; solid-state transformer; hybrid active distribution network

Subjects: Power system management, operation and economics; Transformers and reactors; Distribution networks; Power supply quality and harmonics; DC-AC power convertors (invertors); Voltage control; Power system control; Control of electric power systems; Control system analysis and synthesis methods

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