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New economical design of SVC and passive filters to improve power quality at railway substation: a case study

  • Karuna NikumEmail author
  • Abhay Wagh
  • Rakesh Saxena
  • Bharat Mishra
Case Study

Abstract

In electrified railways, harmonics and low power factor (PF) are typical power quality problems. The traction system of 25 kV, single phase, 50 Hz that exists in India has been taken for this case study. Most of the locomotives are single-phase and draw very high currents. The load is of highly variable nature and introduces high pollution into the power supply lines and distorts PF. The field measurement data in a tractions substation were collected and analyzed. The main objective is to identify an appropriate compensation strategy, which is cost-effective and reliable. This paper proposes a combined system of harmonic filters and thyristor-controlled reactors (TCRs) for PF improvement and reactive power compensation with new economical design of static VAR compensator (SVC). Generally, the SVC requires high-voltage switching of capacitors and inductors at very high cost. In the new concept, the voltage is stepped down to 600 V for reactors and divides into 32 parallel TCRs to handle high current in steps by switching without continuous control of firing angle. This technique makes system reliable and cost-effective. The TCR compensates reactive power dynamically and suppress the possibility of resonance between the SVC and the grid. The proposed system is verified using MATLAB simulation for harmonic filters. The simulated results are found to be quite satisfactory. The proposed solution is cost-effective and highly reliable than conventional SVCs and reduces harmonics to levels recommended in IEEE-519 standards.

Keywords

Harmonics Harmonic distortions IEEE-519 Power factor Power quality Reactive power compensation SVC TCR 

Notes

References

  1. 1.
    S.-L. Chen, R.-J. Li, P.-H. His, Traction system unbalance problem—analysis methodologies. IEEE Trans. Power Deliv 19(4), 1877–1883 (2004)CrossRefGoogle Scholar
  2. 2.
    Z. Shu, S. Xie, Q. Li, Single-phase back-to-back converter for active power balancing, reactive power compensation, and harmonic filtering in traction power system. IEEE Trans. Power Electron. 26(2), 334–343 (2011)CrossRefGoogle Scholar
  3. 3.
    A.T. Langerudy, A. Mariscotti, M.A. Abolhassani, Power quality conditioning in railway electrification: a comparative study. IEEE Trans. Veh. Technol. 66(8), 6653–6662 (2017)CrossRefGoogle Scholar
  4. 4.
    P.-C. Tan, P.C. Loh, dg Holmes, Optimal impedance termination of 25-KV Electrified railway systems for improved power quality. IEEE Trans. Power Deliv. 20(2), 1703–1710 (2005)CrossRefGoogle Scholar
  5. 5.
    M. Popescu, A. Bitoleanu, M. Dobriceanu, Harmonic current reduction in railway systems. WSEAS Trans. Syst. 7(7), 689–698 (2008)Google Scholar
  6. 6.
    A. Luo, Z. Shuai, W. Zhu, Z. John Shen, Combined system for harmonic suppression and reactive power compensation. IEEE Trans. Ind. Electron. 56(2), 418 (2009)CrossRefGoogle Scholar
  7. 7.
    A.T. Langerudy, E.F. Fuchs, K. Al-Haddad, S.M.M. Gazafrudi, Power quality issues in railway electrification: a comprehensive perspective. IEEE Trans. Ind. Electron. 62(5), 3081–3091 (2015)CrossRefGoogle Scholar
  8. 8.
    K.-W. Lao, M.-C. Wong, N.Y. Dai, C.-K. Wong, C.-S. Lam, A systematic approach to hybrid railway power conditioner design with harmonic compensation for high-speed railway. IEEE Trans. Ind. Electron. 62(2), 930–942 (2015)CrossRefGoogle Scholar
  9. 9.
    Y. Tang, P.C. Loh, P. Wang, F.H. Choo, F. Gao, F. Balaabjerg, Generalized design of high performance shunt active power filter with output LCL filter. IEEE Trans. Ind. Electron. 59(3), 1443–1452 (2012)CrossRefGoogle Scholar
  10. 10.
    Z. Chen, Y. Luo, M. Chen, Control and performance of a cascaded shunt active power filter for aircraft electric power system. IEEE Trans. Ind. Electron. 59(9), 3614–3623 (2012)CrossRefGoogle Scholar
  11. 11.
    H. Hu, W. Shi, Y. Lu, Y. Xing, Design considerations for DSP-controlled 400 Hz shunt active power filter in an aircraft power system”. IEEE Trans. Ind. Electron. 59(9), 3624–3634 (2012)CrossRefGoogle Scholar
  12. 12.
    X. Du, L. Zhou, H. Lu, H.M. Tai, DC Link active power filter for three phase diode rectifier. IEEE Trans.Ind. Electron. 59(3), 1430–1442 (2012)CrossRefGoogle Scholar
  13. 13.
    M. Angulo, D.A. Ruiz-Caballero, J. Lago, M.L. Heldwein, S.A. Mussa, Active power filter control strategy with implicit closed loop current control and resonant controller. IEEE Trans. Ind. Electron. 60(7), 2721–2730 (2013)CrossRefGoogle Scholar
  14. 14.
    S. Rahmani, A. Hamadi, K. Al-Haddad, L.A. Dessaint, A combination of shunt hybrid power filter and thyristor-controlled reactor for power quality. IEEE Trans. Ind. Electron. 61(5), 2152–2164 (2014)CrossRefGoogle Scholar

Copyright information

© The Institution of Engineers (India) 2019

Authors and Affiliations

  1. 1.Atharva College of EngineeringMumbaiIndia
  2. 2.Directorate of Technical EducationMumbaiIndia
  3. 3.SGSITSIndoreIndia
  4. 4.MGCGVSatnaIndia

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