Coordinated voltage control of a decoupled three-phase on-load tap changer transformer and photovoltaic inverters for managing unbalanced networks

Abstract

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Experimental testing and model validation of a decoupled‐phase on‐load tap‐changer transformer in an active network

“…Based on the preliminary investigation study presented by the authors in [19] and [20] and thanks to the experimental activity discussed in this paper, the proposed transformer model is now consistent with the behaviour of the real device. 3 The novelty of this work is: 1) the development of a method for experimentally reproducing a real distribution grid in a simplified and reduced-scale experimental facility; 2) an experimental investigation of the decoupled-phase OLTC transformer; 3) the modelling of all the utilized components; and 4) the validation of results from real experiments and simulations.…”

“…The considered distribution system has already been adopted in the previously presented works dealing with the feasibility of the decoupled-tap-changer approach and its effect on the network ( [19] and [20]). In order to define the size of the devices employed in the experimental setup (i.e., OLTC rated power, cable length and impedance, loads power), an analysis of the electrical characteristics of a real system is conducted, in particular with the aim of selecting a suitable cable size (length and section) to represent the line impedance of the reference network.…”

“…Alternatively, as innovative solution, particular attention is given to the decoupled-phase OLTC technology, which could allow a reduction of the unbalance conditions in distribution grids, as demonstrated in [19] and [20]. In these works, the authors investigated the technology by means of mere simulation studies, by modelling the decoupled-phase OLTC operations in a preliminary simplified way with limited modelling insights of the new technology.…”

Investigation of Phase-wise Voltage Regulator Control Logics for Compensating Voltage Deviations in an Experimental Low-voltage Network

“…However, voltage unbalances can increase owing to the independent tap-changing control per phase. In [23]- [25], the same authors investigated the capability of phase-wise OLTC, with the objective of evaluating the hosting capacity of a distribution network characterized by high PV penetration. In the studies, details regarding the modelling and control algorithms of the OLTC are presented.…”

“…In addition, the current studies focus on simulation-based validation that means experimental-based validation is still largely missing in the literature. To address the aforementioned problems, several studies are performed to investigate the control performance provided by a single-phases on-load tap-changer transformer [21]- [25] and validate the OLTC control in an experimental environment [26], [27].…”