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Presenter

Deepak Kumar Soni

IIT- Hyderabad

Co-Authors: Prof. Vaskar Sarkar

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Design of a Robust Excitation System Stabilizer Using H∞ Synthesis to Improve the Stability of a Multi-Machine Power System

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Outline

  • Introduction
  • Literature Review
  • Methodology
  • Results
  • Conclusion and Future Work
  • References

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Introduction

  • Power system stability refer to ability to maintain the acceptable level of operating equilibrium under normal operating condition and following a disturbance [1]
  • Following a disturbance, power mismatch causes generator to accelerate and decelerate, resulting in rotor speed and angle deviation
  • Lack of sufficient synchronizing and damping torque lead to rotor angle swing aperiodically and oscillatory instability respectively
  • A fast responding Excitation control system is used to provide synchronizing torque by generating sufficient magnetic flux to regulate terminal voltage [2]
  • Rate of change of field current is limited due to high inductance and impedance in field winding and transmission line, respectively, leading to significant phase lag in the control function [3]
  • A PSS is used to provide damping to the rotor oscillation, it uses the phase compensation to modify the timing of its corrective output
  • PSS is combined with the fast-acting excitation control, to obtained higher synchronizing torque and the possibility of reduced damping torque can be improved

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Literature Review

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  • Several different types of excitation control systems is reported, where ESS is a integral part [12]
  • In the literature several works have been addressed regarding PSS design
  • Some of the studies only few types of excitation system control with PID controller presented in the forward path, and tuned the parameters using heuristic methods (GA, PSO) [4]
  • Some coordinated design of the PSS and excitation system performed, where controller parameters are tuned simultaneously
  • The parameters of the ESS, present in feedback loop is considered as constant
  • An attempt was made in [9] to improve the transient stability of a generator by adjusting the AVR gain in industrial power system in Mexico
  • The importance of ESS and its effect on the system stability during transient conditions has not been adequately addressed in the literature
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M. J. Basler "Excitation systems: the current state of the art." in Proc. IEEE PES General Meeting, Montreal, QC, Canada, Jun. 2006, pp. 1-7.

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[12] “EXCITER MODELS,” NEPLAN AG, Kusnacht ZH, Switzerland, Aug. 2015, [Online]. Available: https://www.neplan.ch/wpcontent/uploads/2015/08/Nep EXCITERS1.pdf.

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Results:

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Conclusion

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References

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[1] P. Kundur, Power system stability and control. Delhi, India: Tata McGraw-Hill Ed., 2008.

[2] M. J. Basler and R. C. Schaefer, “Understanding power-system stability,” IEEE Trans. Ind. Appl., vol. 44, no. 2, pp. 463–474, Mar. 2008.

[3] K. Kim, P. Rao, and J. A. Burnworth, “Self-tuning of the PID controller for a digital excitation control system,” IEEE Trans. Ind. Appl., vol. 46, no. 4, pp. 1518–1524, May. 2010.

[4] Z.-L. Gaing, “A particle swarm optimization approach for optimum design of PID controller in AVR system,” IEEE Trans. Energy Convers., vol. 19, no. 2, pp. 384–391, May. 2004.

[5] S. Ekinci and B. Hekimoglu, “Improved kidney-inspired algorithm ˘ approach for tuning of PID controller in AVR system,” IEEE Access, vol. 7, pp. 39935–39947, Mar. 2019.

[6] C. M. Verrelli, R. Marino, P. Tomei, and G. Damm, “Nonlinear robust coordinated PSS-AVR control for a synchronous generator connected to an infinite bus,” IEEE Trans. Autom. Control, vol. 67, no. 3, pp. 1414–1422, Mar. 2022.

[7] F. Rodrigues, Y. Molina, and C. Araujo, “Simultaneous tuning of AVR and PSS using particle swarm optimization with two stages,” IEEE Latin Amer. Trans., vol. 18, no. 09, pp. 1623–1630, Sep. 2020.

[8]E. Viveros, G. Taranto, and D. Falcao, “Tuning of generator excitation systems using meta-heuristics,” in Proc. IEEE PES General Meeting, Montreal, QC, Canada, Jun. 2006, pp. 1-6.

[9] J. Calderon, R. Castellanos, and M. Ramirez, “Stability enhancement ´ of an industrial power system by AVR gain readjustment,” IEEE Latin Amer. Trans., vol. 15, no. 4, pp. 663–668, Apr. 2017.

[10] J. J. Grainger and W. D. Stevenson, Power system analysis. New York, USA: McGraw-Hill, 1994.

[11] A. El-Zonkoly, “Optimal tuning of power systems stabilizers and AVR gains using particle swarm optimization,” Int. J. Expert Syst. Appl., vol. 31, no. 3, pp. 551–557, Oct. 2006

[12] “EXCITER MODELS,” NEPLAN AG, Kusnacht ZH, Switzerland, Aug. 2015, [Online]. Available: https://www.neplan.ch/wpcontent/uploads/2015/08/Nep EXCITERS1.pdf.

[13] B. Pal and B. Chaudhuri, Robust Control in Power Systems. New York: Springer-Verlag, 2005.

[14] P. W. Sauer, M. A. Pai, and J. H. Chow, Power System Dynamics and Stability: With Synchrophasor Measurement and Power System Toolbox. Hoboken, NJ, USA: Wiley, 2017.

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THANK YOU

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