Voltage management in unbalanced low voltage networks using a decoupled phase-tap-changer transformer

2015 50th International Universities Power Engineering Conference (UPEC)

et al. 2015

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Abstract-This paper presents modeling and analysis of the potential benefits of joint actions of a MV/LV three-phase power distribution transformer with independent on-load tap-changer control on each phase and photovoltaic inverters provided with reactive power control capability, in terms of accommodating more renewable generations in the LV grid. The potential benefits are investigated in terms of voltage unbalance reduction and local voltage regulation. 24-hours root-mean-square dynamics simulation studies have been carried out with timestep of 1 second using 10-mins resolution consumption and production profiles. A totally passive real Danish low voltage distribution network is used for the grid topology as well as for the characterization of loads profiles, while the production ones are empirically defined under assumptions in scenarios with different level of photovoltaic penetration and grade of unbalance.

Section: Introductionmentioning

confidence: 99%

Voltage control for unbalanced low voltage grids using a decoupled-phase on-load tap-changer transformer and photovoltaic inverters

Zecchino

2015 50th International Universities Power Engineering Conference (UPEC)

et al. 2015

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“…The Control Triples have been chosen from existing practice or results from research projects referred to in the spread sheet [7][8][9][10][11][12][13][14]. A printout of this spread sheet is shown in "Annex I, Observability Fundamentals."…”

Section: E Main Resultsmentioning

confidence: 99%

“…It starts by making separate lists for known and potential control aims, observables and system input signals, both taken from present practice and research projects [7][8][9][10][11][12][13][14]. These have no relation yet.…”

Section: Workflow Of the Surveymentioning

confidence: 99%

Identification of observables for future grids - The framework developed in the ELECTRA project

Visscher¹,

2015 IEEE Eindhoven PowerTech

Morch

et al. 2015

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Abstract-The main subject of this paper is the classification and identification of observables for present and future grids. In order to make an inventory of present and potentially new observables, a systematic classification and identification of observables for future grids is conducted. After first introducing some fundamental definitions for observables, observables are further classified by the characteristic time scale where they are used in the physical power system. For actual use in control loops, observables must be part of so-called "Control Triples" consisting of control aim, observable, and system input signal. A survey of existing and potential Control Triples was conducted among partners in the European ELECTRA project, resulting in a spreadsheet inventory. The main findings are presented and a few major observability needs for realising the so-called "vertical integration" of control schemes reinforced by "horizontal integration" of distributed control schemes in the future grid.

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Zecchino

Electric Power Components and Systems

2016

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