Voltage management strategies for low voltage networks supplied through phase-decoupled on-load-tap-changer transformers

2017 ◽  
Author(s):  
A. Bettanin ◽  
M. Coppo ◽  
A. Savio ◽  
R. Turri
Keyword(s):  
Low Voltage ◽  
Management Strategies ◽  
Tap Changer ◽  
Voltage Management ◽  
Load Tap Changer

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

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2173
Author(s):  
Álvaro Rodríguez del Nozal ◽  
Esther Romero-Ramos ◽  
Ángel Luis Trigo-García
Keyword(s):  
Distributed Generation ◽  
Optimization Problem ◽  
Low Voltage ◽  
Optimal Solution ◽  
Distribution Networks ◽  
Voltage Regulation ◽  
Rigorous Approach ◽  
Tap Changer ◽  
Load Tap Changer ◽  
Active Distribution Networks

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.

Optimal location of voltage sensors in low voltage networks for on-load tap changer application

2017 ◽  
Vol 11 (15) ◽  
pp. 3756-3764 ◽  
Author(s):  
Kalle Rauma ◽  
Florent Cadoux ◽  
Guillaume Roupioz ◽  
Adrien Dufournet ◽  
Nouredine Hadj-Said
Keyword(s):  
Low Voltage ◽  
Optimal Location ◽  
Voltage Sensors ◽  
Tap Changer ◽  
Load Tap Changer

scholarly journals OLTC Transformer Model Connecting 3-Wire MV with 4-Wire Multigrounded LV Networks

2020 ◽  
Author(s):  
Evangelos Pompodakis
Keyword(s):  
Low Voltage ◽  
Comprehensive Model ◽  
Medium Voltage ◽  
Proposed Model ◽  
Tap Changer ◽  
Bus Network ◽  
Transformer Model ◽  
Load Tap Changer

<b>This letter presents a comprehensive model of on-load tap-changer (OLTC) transformers that connect 3-wire medium voltage (MV) with 4-wire multigrounded low voltage (LV) networks. The proposed model enables the inclusion of the 3-wire MV network and the 4-wire multigrounded LV network into a single Y<sub>BUS</sub> matrix without any assumption or simplification. Its distinct feature is that the tap changer of the transformer is simulated outside the Y<sub>BUS</sub> matrix, thus a refactorization of the Y<sub>BUS</sub> matrix is not required in every tap change. The proposed transformer model has been validated in a 4-Bus network, while its performance has been tested in the IEEE 8500-Node and IEEE 906-Bus test networks. </b>

scholarly journals PROPOSAL FOR MANAGING ELECTRIC ENERGY QUALITY IN THE LV GRID USING ON-LOAD TAP CHANGER WITH A STATIC SYNCHRONOUS COMPENSATOR

2018 ◽  
Vol 8 (2) ◽  
pp. 72-78
Author(s):  
Bartłomiej Mroczek ◽  
Karol Fatyga
Keyword(s):  
Reactive Power ◽  
Low Voltage ◽  
Power Grid ◽  
Electric Energy ◽  
Auxiliary Equipment ◽  
Static Synchronous Compensator ◽  
Voltage Quality ◽  
Tap Changer ◽  
Load Tap Changer

The paper proposes the use of auxiliary equipment in the low voltage network: an on-load tap changer and a static synchronous compensator (STATCOM) to improve the quality of energy supply to end users. As part of the research, a section of medium and low voltage power grid was modelled using Matlab & Simulink software, which was tested in three scenarios. The first scenario presents the operation of the power grid with the on-load tap changer installed in the transformer block. The second scenario uses the STATCOM for local reactive power compensation. Additionally, the third scenario is the combined work of the on-load tap-changer along with the STATCOM. According to the authors, the method discussed does not bring the expected results in the area of voltage quality improvement, indicating that further research is required, including tests with energy storage.

scholarly journals OLTC Transformer Model Connecting 3-Wire MV with 4-Wire Multigrounded LV Networks

2020 ◽  
Author(s):  
Evangelos Pompodakis
Keyword(s):  
Low Voltage ◽  
Comprehensive Model ◽  
Medium Voltage ◽  
Proposed Model ◽  
Tap Changer ◽  
Bus Network ◽  
Transformer Model ◽  
Load Tap Changer

<b>This letter presents a comprehensive model of on-load tap-changer (OLTC) transformers that connect 3-wire medium voltage (MV) with 4-wire multigrounded low voltage (LV) networks. The proposed model enables the inclusion of the 3-wire MV network and the 4-wire multigrounded LV network into a single Y<sub>BUS</sub> matrix without any assumption or simplification. Its distinct feature is that the tap changer of the transformer is simulated outside the Y<sub>BUS</sub> matrix, thus a refactorization of the Y<sub>BUS</sub> matrix is not required in every tap change. The proposed transformer model has been validated in a 4-Bus network, while its performance has been tested in the IEEE 8500-Node and IEEE 906-Bus test networks. </b>

scholarly journals OLTC Transformer Model Connecting 3-Wire MV with 4-Wire Multigrounded LV Networks

2020 ◽  
Author(s):  
Evangelos Pompodakis
Keyword(s):  
Low Voltage ◽  
Comprehensive Model ◽  
Medium Voltage ◽  
Proposed Model ◽  
Tap Changer ◽  
Bus Network ◽  
Transformer Model ◽  
Load Tap Changer

<b>This letter presents a comprehensive model of on-load tap-changer (OLTC) transformers that connect 3-wire medium voltage (MV) with 4-wire multigrounded low voltage (LV) networks. The proposed model enables the inclusion of the 3-wire MV network and the 4-wire multigrounded LV network into a single Y<sub>BUS</sub> matrix without any assumption or simplification. Its distinct feature is that the tap changer of the transformer is simulated outside the Y<sub>BUS</sub> matrix, thus a refactorization of the Y<sub>BUS</sub> matrix is not required in every tap change. The proposed transformer model has been validated in a 4-Bus network, while its performance has been tested in the IEEE 8500-Node and IEEE 906-Bus test networks. </b>

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