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

Zecchino, Antonio; Hu, Junjie; Coppo, Massimiliano; Marinelli, Mattia

doi:10.1049/iet-gtd.2016.0352

Cited by 13 publications

(10 citation statements)

References 21 publications

(40 reference statements)

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“…There is a study for using decoupled three‐phase OLTC due to its effectiveness for regulating the voltage profile in the distribution network with DG units. The study results show that the three single‐phase OLTCs are better than three‐phase OLTC in minimising the voltage deviation and the power line losses with high PV penetration [19].…”

Section: Voltage‐violation Mitigation Strategiesmentioning

confidence: 99%

Review on voltage‐violation mitigation techniques of distribution networks with distributed rooftop PV systems

Nour

Hatata

Helal

et al. 2019

IET Generation, Transmission & Distribution

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Section: Voltage‐violation Mitigation Strategiesmentioning

confidence: 99%

Review on voltage‐violation mitigation techniques of distribution networks with distributed rooftop PV systems

Nour

Hatata

Helal

et al. 2019

IET Generation, Transmission & Distribution

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“…DUTs correspond to an actual device whose functionality and impact on the power system is tested using a PHIL approach. The possible list of devices that can be found in the specialized literature is endless, ranging from photovoltaic (PV) inverters [30], wind generators [31], HVDC [32], FACTS [14], energy storage systems [33], electric vehicle charging stations [26], OLTCs for power transformers [34], to digital protective relays [35]. Similarly, the functionalities that can be tested are numerous: primary control of voltage and frequency of Distributed Energy Resources (DERs) [36], current control in VSCs, inertia emulation in DERs [37,38], protection of VSCs during short-circuit faults [20], high-frequency power smoothing of renewable energy resources [39], MPPT in PV systems [40,41], etc.…”

Section: Devices and Algorithms Under Test-duts And Autsmentioning

confidence: 99%

Power System Hardware in the Loop (PSHIL): A Holistic Testing Approach for Smart Grid Technologies

et al. 2020

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The smart-grid era is characterized by a progressive penetration of distributed energy resources into the power systems. To ensure the safe operation of the system, it is necessary to evaluate the interactions that those devices and their associated control algorithms have between themselves and the pre-existing network. In this regard, Hardware-in-the-Loop (HIL) testing approaches are a necessary step before integrating new devices into the actual network. However, HIL is a device-oriented testing approach with some limitations, particularly considering the possible impact that the device under test may have in the power system. This paper proposes the Power System Hardware-in-the-Loop (PSHIL) concept, which widens the focus from a device- to a system-oriented testing approach. Under this perspective, it is possible to evaluate holistically the impact of a given technology over the power system, considering all of its power and control components. This paper describes in detail the PSHIL architecture and its main hardware and software components. Three application examples, using the infrastructure available in the electrical engineering laboratory of the University of Sevilla, are included, remarking the new possibilities and benefits of using PSHIL with respect to previous approaches.

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“…For LV levels, in practice, most utilities with a European-style network design use only the secondary distribution transformers equipped with off-load tap changers to control voltages. Once again, the use of both the traditional and novel MV volt/var control solutions mentioned above has been intensively proposed in the most current literature, but it is not applied in practice [20][21][22][23][24][25][26][27][28][29][30][31]. The use of OLTC transformers in secondary distribution substations is currently the closest to realizing an LV reality [19,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the technology, two different methods of operating an OLTCST are possible: (1) a synchronized tap change among the three phases or (2) decoupled control [32]. Most previous works have dealt with uniform and common tap positions for all three phases of the MV/LV-controlled transformer (3P-OLTCST) [19][20][21]28,30,31,[33][34][35], but increasingly, more tap position settings among transformer phases are being proposed (1P-OLTCST) [24,25,29,32,36]. Decoupled control is obviously a great deal more attractive for LV networks because of their unbalanced nature.…”

Section: Introductionmentioning

confidence: 99%

Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

2019

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Voltage control in active distribution networks must adapt to the unbalanced nature of most of these systems, and this requirement becomes even more apparent at low voltage levels. The use of transformers with on-load tap changers is gaining popularity, and those that allow different tap positions for each of the three phases of the transformer are the most promising. This work tackles the exact approach to the voltage optimization problem of active low-voltage networks when transformers with on-load tap changers are available. A very rigorous approach to the electrical model of all the involved components is used, and common approaches proposed in the literature are avoided. The main aim of the paper is twofold: to demonstrate the importance of being very rigorous in the electrical modeling of all the components to operate in a secure and effective way and to show the greater effectiveness of the decoupled on-load tap changer over the usual on-load tap changer in the voltage regulation problem. A low-voltage benchmark network under different load and distributed generation scenarios is tested with the proposed exact optimal solution to demonstrate its feasibility.

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

Cited by 13 publications

References 21 publications

Review on voltage‐violation mitigation techniques of distribution networks with distributed rooftop PV systems

Review on voltage‐violation mitigation techniques of distribution networks with distributed rooftop PV systems

Power System Hardware in the Loop (PSHIL): A Holistic Testing Approach for Smart Grid Technologies

Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

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