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Performance evaluation of phase-shifting transformer for integration of renewable energy sources

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Abstract

In recent years, the installed power capacity of renewable power plants has been increasing because of the technological developments, industrialization and rapid population growth. This case has led to the extension of electric transmission networks. Extending transmission networks, on the other hand, means the long transmission lines and line losses. The efficient control of electricity transmission systems can be achieved through an efficient selection of devices used in transmission lines as well as the proper management of networks. These devices, called Flexible Alternating Current Transmission System (FACTS) devices, are integrated into transmission lines and provide energy efficiency in the transmission system. In this study, a novel Two-Core Asymmetric Phase-Shifting Transformer (APST) model, which is a serial FACTS device developed for the efficient use of transmission lines, will be realized. The most important factor in the selection of the Two-Core APST model is to obtain a general model that is valid for all quadrature and non-quadrature dual-core APSTs instead of Quadrature Booster type APSTs, which are frequently used in the literature. The designed Two-Core APST model will be tested in an electrical transmission system consisting of a 154 kV source voltage level and loads. Moreover, this model will be applied in IEEE 9-bus system in MATLAB program and changes in transferred power will be examined. Changes in active power transfer and voltage will be observed by the step change of the APST.

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Abbreviations

ET:

Excitation transformer

ARS:

Advanced–retard switch

QB:

Quadrature booster

\( \vec{V}_{\rm source} \) :

Source voltage vector

\( \vec{Z}_{\rm ET} \) :

ET impedance vector

\( \vec{a}_{\rm ET} \) :

ET ratio vector

\( \sigma_{\rm ET} \) :

ET connection angle

\( \vec{I}_{\rm BT} \) :

BT current vector

\( \vec{a}_{\rm BT} \) :

BT ratio vector

\( \vec{Z}_{\rm PST} \) :

PST impedance vector

\( \vec{a}_{\rm PST, advanced} \) :

PST advanced mode phase shifter angle

\( \psi \) :

Phase shift angle

\( P_{\rm transmission} \) :

Transferred active power

BT:

Booster transformer

OLTC:

On-load tap changer

APST:

Asymmetric phase shift transformer

\( \vec{I}_{\rm ET} \) :

ET current vector

\( \vec{V}_{\rm ET} \) :

ET output voltage vector

\( \vec{Z}_{\rm BT} \) :

BT impedance vector

\( \vec{V}_{\rm BT} \) :

BT input voltage vector

\( \Delta V_{\rm BT, secondary} \) :

BT secondary output voltage vector

\( \sigma_{\rm BT} \) :

BT connection angle

\( \vec{a}_{\rm PST,retard} \) :

PST retard mode phase shifter angle

\( \vec{V}_{\rm load} \) :

Load voltage vector

δ :

Power angle

\( \vec{V}_{\rm PST, secondary} \) :

PST secondary voltage vector

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Acknowledgements

The authors would like to acknowledge the Scientific Project Unit of Çukurova University (Project Number: FYL-2016-7616) for full financial support.

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Correspondence to Burak Esenboğa.

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Sakallıoğlu, B., Esenboğa, B., Demirdelen, T. et al. Performance evaluation of phase-shifting transformer for integration of renewable energy sources. Electr Eng 102, 2025–2039 (2020). https://doi.org/10.1007/s00202-020-01011-9

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