On-Line Independent Tap-Changing of Each Feeder Supplied by a Low Voltage Distribution Transformer ()
Abstract
An on-line tap-changing circuit was developed for use with low voltage transformers (10 kV/380 V, or equivalent), in which the tap positions could be set independently for each low voltage feeder. This allows for possible variation in loads and distributed generation between different feeders fed from a given transformer, allowing the line voltages to be kept within limits on all feeders. A combination of computer simulation and practical experiments was used. A model constructed in Excel gave preliminary results, which was used to specify a more detailed model in Matlab? Simulink. A small-scale 220/380 V distribution network was constructed, with currents limited to 5 A per phase. Finally, a rotary switch was constructed, suitable for currents up to 500 A, which would be required for a full-scale low voltage distribution network. The results showed that the voltage
could be kept within limits, even with a large difference in load and distributed generation from one feeder to another.
Share and Cite:
Johnston, D. (2014) On-Line Independent Tap-Changing of Each Feeder Supplied by a Low Voltage Distribution Transformer.
Journal of Power and Energy Engineering,
2, 388-394. doi:
10.4236/jpee.2014.24052.
Conflicts of Interest
The authors declare no conflicts of interest.
References
|
[1]
|
EN 50160—European Committee for Electrotechnical Standardisation.
|
|
[2]
|
GB/T 12325 (2003) Admissible Deviation of Supply Voltage.
|
|
[3]
|
Weedy, B.M. (1994) Electric Power Systems. John Wiley & Sons.
|
|
[4]
|
Aly, G.E.M., El-Zeftawy, A.A., El-Hefnawy, A.A. and Eraky, S.A. (1999) Technical Assessment of Electric Utility- Interactive Residential Photovoltaic Systems. Electric Power Systems Research, 51, 175-185.
http://dx.doi.org/10.1016/S0378-7796(98)00159-X
|
|
[5]
|
Milanovi?, J.V. (2001) Characteristics of Voltage Sags in Radial Networks with Dynamic Loads and Embedded Generators. Proceedings of the IEEE Power Technology Conference, Porto.
|
|
[6]
|
Ackermann, T., Andersson, G. and Söder, L. (2001) Distributed Generation: A Definition. Electric Power Systems Research, 57, 95-204. http://dx.doi.org/10.1016/S0378-7796(01)00101-8
|
|
[7]
|
El-Khattam, W. and Salama, M.M.A. (2004) Distributed Generation Technologies, Definitions and Benefits. Electric Power Systems Research, 71, 119-128. http://dx.doi.org/10.1016/j.epsr.2004.01.006
|