DOI: https://doi.org/10.15587/1729-4061.2014.26263

Optimal control of mutual impact of electric grids for the reduction of their electric energy losses

Petro Lezhniuk, Olexandr Rubanenko, Anton Kylymchuk

Abstract


The subject of the research comprise the methods, aimed at determination of additional losses of active power, caused by forced displacement of transit transfers from high voltage (HV) into low voltage (LV) grids, which contain besides the transformers with tap-changing under load, also cross-transformers (CT).

The research for the first time performs the analysis of the impact of CT location and its angle on the losses of active power in the branches of LV grid and on general system losses, that takes into consideration the change of additional losses of active power at the expense of forced displacement of transit transfers from LV grids into HV grids and vice versa. The paper contains the algorithms and explanation of their operation, that enables to determine optimal branch and CT angle, as well as, in case of their implementation, allow to decrease power losses.

Results of research, considered in the paper are used in power industry, namely for calculation of normal modes and optimal parameters of control impacts vectors in order to degrease active power losses in electric grids.

The results obtained in the process of the research prove that application of CT with optimal phase angle in the branch, defined by the suggested method of CT determination of CT optimal place location allows to decrease, both losses of active power in LV grids and general system losses, the degree of mutual and transit power transfers impact on the level of active electric energy losses changes depending on autotransformers transformation ratios, value of CT phase-shifting angle, circuit parameters and electric grid loading mode; studies of additional losses of active power change, caused by the displacement of transit transfers of power from HV grids into LV grids shows that sometimes: uncoordinated usage of regulating devices of the transformers in HV and LV grids leads to growth of these additional power losses; usage of transformers tap-changing under load does not allow to decrease maximally losses of active power, greater decrease of these losses can be achieved by optimal usage of СT.

Keywords


control impacts vectors; additional losses of active power; cross-transformer; phase-shifting angle; mutual and transit power transfers

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References


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GOST Style Citations


1. Zhelezko, Yu. S. Calculation, analysis and valuation of electric energy losses in electric grids [Text] / Yu. S. Zhelezko, A. V. Arteniev, O. V. Savchenko. – Moscow ENAC, 2003. – 280 p.

2. Talasov, A. G. Losses on electric energy transit and their distribution among participants of energy exchange [Text] / A. G. Talasov // Electric stations. – 2002. – Vol. 1. – P. 20–25.

3. Stogniy, B. V. Determination of transit losses of power in fragmented electric grids of regional utility companies [Text] / B. V. Stogniy, V. V. Pavlovskiy // Energy policy of Ukraine. – 2004. – Vol. 5. – P. 60–65.

4. Idelchik, V. I. Electric systems and grids [Text] / V. I. Idelchik. – Moscow: Energoatomizdat (Publishing house), 1989. – 592 p.

5. Olshvang, M. V. Characteristic features of cross-transformer technology of energy transport in 110-765 kV grids [Text] / M. V. Olshvang // Electro. – 2004 – Vol. 2. – P. 6–12.

6. Kylymchuk, A. V. Minimization of additional losses of electricity in electric networks caused of their interaction [Text] / A. V. Kylymchuk, P. D. Lezhniuk, O. E. Rubanenko // Visnyk VPI Vinnytsia National Technical University. – 2013. – Vol. 5. – P. 48–52.

7. Yasen, M. H. Evaluation of electric energy losses in Kirkuk distribution electric system area [Text] / M. H. Yasen, S. S. Mustafa // Energy, Power and Control (EPC-IQ), 2010 1st International Conference on, 2010. – P. 339–344.

8. Babu, P. R. Operation and control of electrical distribution system with extra voltage to minimize the losses [Text] / P. R. Babu, B. Sushma // Power, Energy and Control (ICPEC), 2013 International Conference on, 2013. – P. 165–169. doi:10.1109/ICPEC.2013.6527643

9. Musa, I. Integration of Distributed Generation for network loss minimization and voltage support using Particle Swarm Optimization [Text] / I. Musa, B. Zahawi, S. M. Gadoue, D. Giaouris // Power Electronics, Machines and Drives (PEMD 2012), 6th IET International Conference on, 2012. – P. 27–29. doi: 10.1049/cp.2012.0150

10. McDonald, L Minimisation of distribution network real power losses using a smart grid Active Network Management System [Text] / L. McDonald, R. L. Storry, A. Kane, F. McNicol // Universities Power Engineering Conference (UPEC), 2010 45th International, 2010. – P. 1–6.

11. Lezhnyuk, P. D. Electric networks and systems interaction in optimal regulation processes of their regimes [Text] / P. D. Lezhnyuk, V. V. Kulyk, O. B. Burykin. – Vinnytsya: UNIVERSUM-Vinnytsya, 2008 – 123 p.

12. Bocovich, M. Overview of series connected flexible AC transmission systems (FACTS) [Text] / M. Bocovich, K. Iyer, R. M. Terhaar, N. Mohan // North American Power Symposium (NAPS), 2013. – P. 1–6. doi: 10.1109/NAPS.2013.6666915

13. Siddiqui, A. S. Application of phase shifting transformer in Indian Network [Text] / A. S. Siddiqui, S. Khan, S. Ahsan, M. I. Khan, A. Annamalai //Green Technologies (ICGT), International Conference, 2012. – P. 186–191. doi: 10.1109/ICGT.2012.6477970

14. Kolcun, M. Transformer use for active power flow control in the electric power system [Text] / M. Kolcun, D. Hluben, L. Bena, N. Djagarov, Z. Grozdev // Environment and Electrical Engineering (EEEIC), 2010 9th International Conference on, 2010. – P. 246–249. doi: 10.1109/EEEIC.2010.5489982

15. Rimez, J. Grid implementation of a 400MVA 220/150kV –15°/+3° phase shifting transformer for power flow control in the Belgian network: specification and operational considerations [Text] / J. Rimez, R. Van Der Planken, D. Wiot, G. Claessens, E. Jottrand, J. Declercq. – Cigre 2006, 2006. – P. A2-202.

16. Constantin, C. Power flow control solutions in the Romanian power system under high wind generation conditions [Text] / C. Constantin, M. Eremia, L. Toma // PowerTech (POWERTECH), 2013 IEEE Grenoble, 2013. – P. 1–6. doi: 10.1109/PTC.2013.6652353

17. El Hraiec, A. Control of parallel EHV interconnection lines using Phase Shifting Transformers [Text] / A. El Hraiec, K. Ben-Kilani, M. Elleuch // Multi-Conference on Systems, Signals & Devices (SSD), 2014 11th International, 2014. – P. 1–7. doi: 10.1109/SSD.2014.6808829

18. Lezhniuk, P. D. Evaluation of the interaction of energy systems electric grids with transformer couplings [Text] / P. D. Lezhniuk, V.V . Kulyk, O. B. Burykin // Engineering electrodynamics: Thematic issue “Problems of modern electrical engineering” – 2006. – Vol. 7. – P. 27–30.

19. Lezhniuk, P. D. Optimal control of power flows and voltage in non-uniform electric grids: monograph [Text] / P. D. Lezhniuk, V. V. Kulyk. – Vinnytsya: UNIVERSUM – Vinnytsya, 2003. – 188 p.

20. Kuznetsov, V. G. Optimization of electric grids modes [Text] / V. G. Kuznetsov, Yu. I. Tugaiy, V. A. Bazhenov. – K.: Naukova Dumka, 1992. – 216 p.

21. Lezhniuk, P. D. Modelling and formation of the conditions of self optimization of electric energy system modes [Text] / P. D. Lezhniuk, V. V. Kulyk, K. I. Kravtsov // Technical electrodynamics: Thematic issue: Problems of moderns electrical engineering. – 2002 – Vol. 3. – P. 96–101.

22. Kylymchuk, A. V. Control automation of power flows in EPS with the use of cross-transformers and similarity of the optimal modes [Electronic resource] / A. V. Kylymchuk, P. D. Lezhniuk, Ngoma Jean-Pierre // Vinnytsia National Technical University. – 2009. – Vol. 4. – Available at: http://www.nbuv.gov.ua/e-journals/vntu/2009-4/2009-4_ru.files/ru/09pdloms_ru.pdf

23. Mustafaev, R. I. Daily allowance graphics of loading and operating parameters [Electronic resource] / R. I. Mustafaev, R. G. Mironov / Problems of energy branch. – 2003. – Vol. 3. – Available at: http://www.science.gov.az/physics/PowerEng/2003/v3article/art14.pdf


 

Cited-by:

1. Impact of linear regulator, installed in the electric grid of energy supply company, on power losses
A. Kylymchuk, P. Lezhnyuk, O. Rubanenko
2017 IEEE First Ukraine Conference on Electrical and Computer Engineering (UKRCON)  First page: 411  Year: 2017  
doi: 10.1109/UKRCON.2017.8100521





Copyright (c) 2014 Olexandr Rubanenko, Petro Lezhnyuk, Anton Kylymchuk

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061