Title:

Equivalent circuit and calculation of unbalanced power in threewire threephase linear networks

Author:

MontoyaMira, Rafael
DiezAznar, JoséManuel
Blasco Espinosa, Pedro Angel
Montoya Villena, Rafael

UPV Unit:

Universitat Politècnica de València. Departamento de Ingeniería Eléctrica  Departament d'Enginyeria Elèctrica

Issued date:


Abstract:

[EN] For analysis of threewire threephase linear systems, the transformations wyedelta and deltawye from theorem of Kennelly are used. These transformations can be applied to balanced systems but not to unbalanced ...[+]
[EN] For analysis of threewire threephase linear systems, the transformations wyedelta and deltawye from theorem of Kennelly are used. These transformations can be applied to balanced systems but not to unbalanced systems. This is due to the fact that zerosequence voltages or zerosequence currents are present in these types of connections. This modifies the value of the unbalance power in the load with respect to the generator. These zerosequence voltages and currents that appear in generators and loads are not transferred over the network. The zerosequence voltage in a deltaconnected load and the zerosequence current that is obtained using theorem of Kennelly in a starconnected load, or vice versa, cause different imbalance effects. Here, the equivalent circuit for any point of the system is developed. The impedances of the equivalent circuit in any node are calculated using linetoline voltages and line currents. This equivalent circuit incorporates all energetic phenomena, including the unbalance of all downstream loads. For its verification, the phasor unbalance power is used.
[]

Subjects:

Phasor measurement
,
Electric power generation
,
Equivalent circuits
,
Equivalent circuit
,
Unbalanced power calculation
,
Threewire threephase linear network
,
Wyedelta transformation
,
Deltawye transformation
,
Kennelly theorem
,
Zerosequence voltage,zerosequence current,deltaconnected load,starconnected load,linetoline voltage,line current,phasor unbalance power

Copyrigths:

Reserva de todos los derechos

Source:

IET Generation Transmission & Distribution. (issn:
17518687
)

DOI:

10.1049/ietgtd.2017.0670

Publisher:

Institution of Electrical Engineers

Publisher version:

http://doi.org/10.1049/ietgtd.2017.0670

Type:

Artículo
