Implementation of regenerative braking on the AC locomotive with a mono phase reversible voltage converter

Introduction. The authors analyse the problem of implementing regenerative braking on the AC locomotive with a monophase reversible voltage converter.

Materials and methods. The article consided theoretically possible options for the operation of monophase reversible voltage converters during regenerative braking, in which: 1) the reactive component of the electric locomotive current had a capacitive nature, and the operating current of the electric locomotive was ahead of its reactive component; 2) the reactive component of the electric locomotive current had an inductive nature, and the current of the electric locomotive was ahead of its active component. The research demonstrated that the former was only theoretically possible, since the regeneration of current into the contact network was carried out at a very low voltage, significantly less than the lowest voltage on the current collector. The latter was technically feasible in terms of the main harmonic of the electric locomotive current lagged by an angle exceeding of 90 electrical degree, but noticeably smaller than 180 electrical degree. Regenerative braking with a power factor close to unity was possible only theoretically, but in practice a power factor of 0.8–0.9 should be realized. The tangent of the angle between the effective current and its active component was greater (for a certain margin) than the quotient from dividing the active by the inductive resistance of the traction network between the electric locomotive and the traction substation. Moreover, it was necessary to consider the technological reduction of the ohmic resistance in the process of the monophase reversible voltage transducer control (e. g. over the deterioration of contact wire).

Results. The article demonstrates the possibility and conditions for the regenerative braking implementation on AC locomotives. Hence, a more advanced electric locomotive current control system with an additional channel for regulating the inductive component of the recuperation current is recommended for development.

Discussion and conclusion. An advanced control system stabilizes the current collector voltage and with the channel for regulating the active component of the regeneration current provide for the voltage maintanance at a higher level, determined by the actual electrical parameters of the contact network and the train traffic.

1. GOST 6962–75. Transport elektrifitsirovannyy s pitaniem ot kontaktnoy seti. Ryad napryazheniy [Electrified transport with overhead system power supply. Voltage row], data vvedeniya [introduction date] 1977-01-01. Moscow: Gos. komitet standartov Soveta Ministrov SSSR [State committee of standards of the Council of Ministers of the USSR] Publ.; 1976. 8 p. (In Russ.).

2. Tikhmenev B. N., Kuchumov V. A. Elektrovozy peremennogo toka s tiristornymi preobrazovatelyami [AC electric locomotives with thyristor converters]. Moscow: Transport Publ.; 1988. 312 p. (In Russ.).

3. Depenbrock M. Einphasen–Stromrichter mit sinusformigen Netzform und gut geglatteten Gleichgrossen. ETZ–A. 1973;94(8):466–471.

4. Körber J. Grundlegende Gesichtspunkte für die Auslegung elektrischer Triebfahzeuge mit asynchronen Fahrmotoren. Elektrische Bahnen. 1974;45(3):52–59.

5. Guthlein H. Die neue electrischer Lokomotive 10 der Deutschen Bundesbahn in Drehstromantriebstechnik. Elektrische Bahnen. 1974;45(9):248–257.

6. Litovchenko V. V. Opredelenie energeticheskikh pokazateley elektropodvizhnogo sostava peremennogo toka s 4q–S preobrazovatelyami [Determination of energy indicators of AC electric rolling stock with 4q–S converters]. Elektrotekhnika = Russian Electrical Engineering. 1993;(5):23–31. (In Russ.).

7. Igin V. N. Energoeffektivnost' lokomotivov v zerkale statistiki [Energy efficiency of locomotives in the mirror of statistics]. Lokomotiv = Locomotive. 2016;(8):2–6. (In Russ.).

8. Usvitskiy S. A. Puti sozdaniya novogo pokoleniya magistral'nykh elektrovozov [Ways to create a new generation of mainline electric locomotives]. Vestnik Vserossiyskogo nauchno-issledovatel'skogo i proektnokonstruktorskogo instituta elektrovozostroeniya (Vestnik VELNII) = Bulletin of the All-Russian Scientific Research and Design Institute of Electric Locomotive Building (VELNII Bulletin). 2009;2(58):17–33. (In Russ.).

9. Markvardt K. G. Elektrosnabzhenie elektrifitsirovannykh zheleznykh dorog [Power supply of electrified railways]. Moscow: Transport Publ.; 1982. 528 p. (In Russ.).

10. Ter-Oganov E. V., Pyshkin A. A. Elektrosnabzhenie zheleznykh dorog: ucheb. [Power supply of railways: Textbook]. Ekaterinburg, UrGUPS Publ.; 2014. 432 p. (In Russ.).

11. Bykov Yu. G., In'kov Yu. M., Simonov M. D. Regulirovochnye kharakteristiki odnofaznogo obratimogo preobrazovatelya napryazheniya [Regulating features of a monophase reversible voltage converter]. Elektrichestvo = Electricity. 1996;(9):63–66. (In Russ.).

12. O bezopasnosti zheleznodorozhnogo podvizhnogo sostava: tekhnicheskiy reglament Tamozhennogo soyuza: TR/TS 001/2011 (v redaktsii Resheniya Soveta Evraziyskoy ekonomicheskoy komissii ot 14 sentyabrya 2021 g. № 90) [On the safety of railway rolling stock: technical regulations of the Customs Union: TR/TS 001/2011 (as amended by the Decision of the Council of the Eurasian Economic Commission dated September 14, 2021 No. 90)]. URL: http://www.eurasiancommission.org/ru/act/texnreg/deptexreg/tr/Documents/TR%20Podvignoisostev%20PID.pdf (access date: 11.02.2022). (In Russ.).

13. Kulinich Yu. M. Elektronnaya preobrazovatel'naya tekhnika: ucheb. posobie dlya studentov vuzov zh.-d. transporta [Electronic converting technology: Tutorial for students of transport universities]. Moscow: Ucheb.-metod. tsentr po obrazovaniyu na zh.-d. transporte [Educational and methodological center for education in railway transport] Publ.; 2015. 202 p. (In Russ.).

14. Ermolenko D. V. Povyshenie elektromagnitnoy sovmestimosti sistemy tyagovogo elektrosnabzheniya s tiristornym elektropodvizhnym sostavom: avtoref. dis. ... kand. tekhn. nauk [Improving the electromagnetic compatibility of the traction power supply system with thyristor electric rolling stock: Cand. … Dr. Tech. Sci. Synopsis]. Moscow: VNIIZhT Publ.; 1979. 22 p. (In Russ.).

15. Savos'kin A. N., Kulinich Yu. M., Alekseev A. S. Matematicheskoe modelirovanie elektromagnitnykh protsessov v dinamicheskoy sisteme “kontaktnaya set' — elektrovoz” [Mathematical modeling of electromagnetic processes in the dynamic system “contact network — electric locomotive”]. Elektrichestvo = Electricity. 2002;(2):29–35. (In Russ.).

16. Figurnov E. P., Bykadorov A. L., Zharkov Yu. I., et al. Soprotivleniya elektrotyagovoy seti odnofaznogo peremennogo toka zheleznykh dorog [Resistances of the electric traction network of monophase AC of railways]. Elektrichestvo = Electricity. 2021;(11):35–44. (In Russ.).