Controlled Brushless De-Excitation Structure for Synchronous Generators

Authors

  • S. E. Chouaba DAC-HR Laboratory, Ferhat Abbas University Setif I, Algeria
  • A. Barakat Electrical & Computer Engineering Department, Beirut Arab University, Lebanon

Abstract

The main weakness of the brushless excitation system in a synchronous generator (SG) is the slow de-excitation response obtained during a load rejection. That is why voltage overshoots may be observed on the generator terminals. This behavior is mainly due to the exciter machine response time and the rotating diode bridge which is not able to quickly de-excite the generator by negative excitation voltages. This paper presents a new brushless de-excitation structure able to perform a quick de-excitation of the generator by providing controlled negative excitation voltage to the generator main field winding. The proposed structure is based on a new brushless de-excitation machine, called a control machine, and mounted on the same shaft of the generator and the brushless exciter. The brushless control machine is a low power one and used to transfer the orders from the voltage regulator to the discharge system located on the rotor side of the main generator. The dynamic performance of the proposed de-excitation system is evaluated in terms of system stability, voltage regulation response times and voltage overshoots during different load rejection tests. The proposed system is compared to the conventional brushless excitation system without the proposed de-excitation structure. In addition, a comparison is done with the static excitation system. The simulation tests are realized on an experimentally validated model of 11kVA synchronous generator developed in Matlab/Simulink.

Keywords:

excitation system, synchronous generator, brushless excitation, static excitation, voltage regulation, feedback control systems

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References

M. Mirosevic, Z. Maljkovic, “Effect of Sudden Change Load on Isolated Electrical Grid”, International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles, Aachen, Germany, March 3-5, 2015 DOI: https://doi.org/10.1109/ESARS.2015.7101465

I. Boldea, “Electric generators and motors: an overview”, CES Transactions on Electrical Machines and Systems, Vol. 1, No. 1, pp. 3-14, 2017 DOI: https://doi.org/10.23919/TEMS.2017.7911104

G. G. Gutierrez, D. M. Romero, M. R. Cabello, E. Pascual-Gil, L. D. Angulo, D. G. Gomez, S. G. Garcia, “On the design of aircraft electrical structure networks”, IEEE Transactions on Electromagnetic Compatibility, Vol. 58, No. 2, pp. 401–408, 2016 DOI: https://doi.org/10.1109/TEMC.2016.2514379

B. Stevens, A. Dubey, S. Santoso, “On improving reliability of shipboard power system”, IEEE Transactions Power Systems, Vol. 30, No. 4, pp. 1905–1912, 2015 DOI: https://doi.org/10.1109/TPWRS.2014.2354638

J. K. Noland, M. Giset, F. Alves, “Continuous Evolution and Modern Approaches of Excitation Systems for Synchronous Machines”, XIII International Conference on Electrical Machines, Alexandroupoli, Greece, September 3-6, 2018 DOI: https://doi.org/10.1109/ICELMACH.2018.8507212

R. C. Schaefer, “Applying static excitation systems”, IEEE Industry Applications Magazine, Vol. 4, No. 6, pp. 41-49, 1998 DOI: https://doi.org/10.1109/2943.730764

J. Taborda, “Modern Technical Aspects of Field Discharge Equipment for Excitation Systems”, IEEE Power and Energy Society General Meeting-Conversion and Delivery of Electrical Energy in the 21st Centuty, Pittsburgh, USA, July 20-24, 2008 DOI: https://doi.org/10.1109/PES.2008.4596955

C. A. Platero, M. Redondo, F. Blazquez, P. Frias, “High-speed de-excitation system for brushless synchronous machines”, IET Electric Power Application, Vol. 6, No. 3, pp. 156-161, 2012 DOI: https://doi.org/10.1049/iet-epa.2011.0088

A. Barakat, S. Tnani, G. Champenois, E. Mouni, “Output voltage control of synchronous generator using diode and thyristor excitation structures combined with multivariable H∞ controllers”, IET Electric Power Applications, Vol. 6, No. 4, pp. 203-213, 2012 DOI: https://doi.org/10.1049/iet-epa.2011.0013

D. M. Sajnekar, S. B. Deshpande, R. M. Moharil, “Efficient PID Controller Tuning Method Selection to be Used in Excitation System of Brushless Synchronous Generator”, International Conference on Computation of Power, Energy Information and Communication, Chennai, India, April 20-21, 2016 DOI: https://doi.org/10.1109/ICCPEIC.2016.7557266

N. M. Guan, W. Pan, J. Zhang, Q. Hao, J. Cheng, X. Zheng, “Synchronous generator emulation control strategy for voltage source converter (VSC) stations”, IEEE Transactions on Power Systems, Vol. 30, No. 6, pp. 3093–3101, 2015 DOI: https://doi.org/10.1109/TPWRS.2014.2384498

H. Zhang, F. Shi, Y. Liu, “Enhancing optimal excitation control by adaptive fuzzy logic rules”, International Journal of Electrical Power and Energy Systems, Vol. 63, pp. 226-235, 2014 DOI: https://doi.org/10.1016/j.ijepes.2014.06.001

E. Swidenbank, S. Mcloone, D. Flynn, G. W. Irwin, M. D. Brown, B. W. Hogg, “Neural Network Based Control for Synchronous Generators”, IEEE Transactions on Energy Conversion, Vol. 14, No. 4, pp. 1673-1678, 1999 DOI: https://doi.org/10.1109/60.815122

R. L. A. Ribeiro, C. M. S. Neto, F. B. Costa, T. O. A. Rocha, R. L. Barreto, “A sliding-mode voltage regulator for salient pole synchronous generator”, Electric Power Systems Research, Vol. 129, pp. 178-184, 2015 DOI: https://doi.org/10.1016/j.epsr.2015.07.016

E. Rebollo, C. A. Platero, F. Blazquez, R. Granizo, “Internal sudden short-circuit response of a new hsbds for brushless synchronous machines tested on a 15 MVA generator”, IET Electric Power Applications, Vol. 11, No. 4, pp. 495–503, 2017 DOI: https://doi.org/10.1049/iet-epa.2016.0525

F. Bensmaine, A. Barakat, S. Tnani, G. Champenois, E. Mouni, “Dual control of synchronous generator for terminal voltage regulation-comparison with a single control”, Electric Power System Research, Vol. 91, No. 1, pp. 78-86, 2012 DOI: https://doi.org/10.1016/j.epsr.2012.05.010

A. Barakat, S. Tnani, G. Champenois, E. Mouni, “Monovariable and multivariable voltage regulator design for a synchronous generator modeled with fixed and variable loads”, IEEE Transactions on Energy Conversion, Vol. 26, No. 3, pp. 811-821, 2011 DOI: https://doi.org/10.1109/TEC.2011.2126045

A. Barakat, S. Chouaba, “Performance Improvement of Brushless Generator Voltage Regulation by Using a Controlled Non Linear Discharge Resistor”, XXIII International Conference on Electrical Machines, Alexandroupoli, Greece, September 3-6, 2018 DOI: https://doi.org/10.1109/ICELMACH.2018.8507159

K. J. Astrom, T. Hagglund, PID Controllers: Theory, Design, and Tuning, Instrument Society of America, 1995

K. Kim, R. C. Schaefer, “Tuning a pid controller for a digital excitation control system”, IEEE Transactions on Industry Applications, Vol. 41, No. 2, pp. 485-492, 2005 DOI: https://doi.org/10.1109/TIA.2005.844368

M. Gunes, N. Dogru, “Fuzzy control of brushless excitation system for steam turbogenerators”, IEEE Transactions on Energy Conversion, Vol. 25, No. 3, pp. 844-852, 2010 DOI: https://doi.org/10.1109/TEC.2010.2040283

E. Mouni, S. Tnani, G. Champenois, “Synchronous generator output voltage real-time feedback control via h∞ strategy”, IEEE Transactions on Energy Conversion, Vol. 24, No. 2, pp. 329-337, 2009 DOI: https://doi.org/10.1109/TEC.2008.2005315

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How to Cite

[1]
S. E. Chouaba and A. Barakat, “Controlled Brushless De-Excitation Structure for Synchronous Generators”, Eng. Technol. Appl. Sci. Res., vol. 9, no. 3, pp. 4218–4224, Jun. 2019.

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