Supplementary Control of Conventional Coordinated Control for 1000 MW Ultra-supercritical Thermal Power Plant using Dynamic Matrix Control

  • Lee, Youngjun (School of Electrical and Electronic Engineering, Chung-Ang University) ;
  • Yoo, Euiyeon (School of Electrical and Electronic Engineering, Chung-Ang University) ;
  • Lee, Taehyun (School of Electrical and Electronic Engineering, Chung-Ang University) ;
  • Moon, Un-Chul (School of Electrical and Electronic Engineering, Chung-Ang University)
  • Received : 2017.03.23
  • Accepted : 2017.08.28
  • Published : 2018.01.01


This paper proposes supplementary control of conventional coordinated control of a power plant which directly affects network frequency. The supplementary control with dynamic matrix control is applied for 1000 MW power plant with ultra-supercritical (USC) once-through boiler. The supplementary control signal is added to the boiler feedforward signal in the existing coordinated control logic. Therefore, it is a very practical structure that can maintain the existing multi-loop control system. This supplementary controller uses the step response model for the power plant system, and on-line optimization is performed at every sampling step. The simulation results demonstrate the effectiveness of the proposed supplementary control in a wide operating range of a practical 1000 MW USC power plant simulator. These results can contribute the stable operation of power system frequency.

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Fig. 1. Schematic of a 1000 MW large-scale power plantmodel with USC boiler-turbine system

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Fig. 2. Schematic of the conventional boiler combustion incoordinated control

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Fig. 3. Schematic of the proposed DMC

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Fig. 4. Variation of electric output (MWO) due to stepincrease of DBFF

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Fig. 5. Variation of boiler master demand (BMD) due tostep increase of DBFF

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Fig. 6. Variation of boiler feed forward (BFF) due to stepincrease of DBFF

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Fig. 7. Variation of main steam pressure (MSP) due to stepincrease of DBFF

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Fig. 8. Comparison of MWO between Multi-loop andDMC controls

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Fig. 9. Comparison of MSP between Multi-loop and DMCcontrols

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Fig. 10. Comparison of BFF between Multi-loop and DMCcontrols

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Fig. 11. Variation of DMC output (DBFF)

Table 1. Steady-state values of CVs

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Table 2. Percentages of DMC/Multi-loop performance in MWO of Fig. 8

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Table 3. Percentages of DMC/Multi-loop performance in MSP of Fig. 9

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Supported by : Korea Institute for Advancement of Technology (KIAT)


  1. J. Adams, D.R. Clark, J.R. Louis, and J.P. Spanbauer, "Mathematical Model of Once-Through Boiler Dynamics," IEEE Trans. on Power Systems, vol. 84, no. 2, pp. 146-156, 1965.
  2. R. T. Byerly et al., "Dynamic models for steam and hydro turbines in power system studies," IEEE Committee Report, Trans. on PAS, vol. 92, no. 6, pp. 1904-1915, Nov./Dec. 1973.
  3. F. P. de Mello et al., "Dynamic models for fossil fueled steam units in power system studies," IEEE Trans. on Power Systems, vol. 6, no. 2, pp. 753-761, May 1991.
  4. T. Inoue, H. Taniguchi and Y. Ikeguchi, "A model of fossil fueled plant with once-through boiler for power system frequency simulation studies," IEEE Trans. on Power Systems, vol. 15, no. 4, pp. 1322-1328, Nov. 2000.
  5. F. Alobaid, J. Storohle, B. Epple, and H.G. Kim, "Dynamic simulation of a supercritical once-through heat recovery steam generator during load changes and start-up procedures," Applied Energy, vol. 86, pp. 1274-1282, 2009.
  6. X. Liu, X. Tu, G. Hou, and J. Wang, "The Dynamic Neural Network Model of a Ultra Super-critical Steam Boiler Unit," American Control Conference, San Francisco, CA, USA, Jun 29-July 01, 2011.
  7. P. J. Gawthrop and P. E. Nomikos, "Automatic tuning of commercial PID controllers for single loop and multiloop applications," IEEE Control Systems Magazine, vol. 10, no. 1, pp. 34-42, 1990.
  8. L. Ma, K. Y. Lee and Z. Wang, "Intelligent coordinated controller design for a 600MW supercritical boiler unit based on expanded-structure neural network inverse models," Control Engineering Practice, vol. 53, pp. 194-201, 2016.
  9. X.-J. Liu and C. W. Chan, "Neuro-Fuzzy Generalized Predictive Control of Boiler Steam Temperature," IEEE Trans. on Energy Conversion, vol. 21, no. 4, pp. 900- 908, 2006.
  10. U.-C. Moon and K. Y. Lee, "Step-Response Model Development for Dynamic Matrix Control of a Drum-Type Boiler-Turbine System," IEEE Trans. on Energy Conversion, vol. 24, no. 2, pp. 423-430, 2009.
  11. U.-C. Moon, and K. Y. Lee, "An Adaptive Dynamic Matrix Control with Fuzzy-Interpolated Step-Response Model for a Drum-Type Boiler-Turbine System," IEEE Trans. on Energy Conversion, vol. 26, no. 2, pp. 393-401, June 2011.
  12. X. Kong, X. Liu, and K. Y. Lee, "An Effective Nonlinear Multivariable HMPC for USC Power Plant Incorporating NFN-Based Modeling," IEEE Trans. on Industrial Informatics, vol. 12, no. 2, pp. 555-566, 2016.
  13. K. Y. Lee, et al., "Controller design for a large-scale ultrasupercritical once-through boiler power plant," IEEE Trans. on Energy Conversion, vol. 25, no. 4, pp. 1063-1070, Dec. 2010.
  14. D. Flynn, Thermal power plant simulation and control, IET Power and energy series 43, 2003.
  15. K. Lee et al., "Development of APESS software for power plant simulation," ASME 2010 Pressure Vessels and Piping Conference, vol. 9, Washington, USA, July 18-22, 2010.
  16. J. H. Lee, "Model Predictive Control in the Process Industries: Review, Current Status and Future Outlook," Proceedings of the 2nd Asian Control Conference, vol. II, pp. 435-438, Seoul. July 22-25, 1997.
  17. D. E. Seborg, T. E. Edgar, and D. A. Mellichamp, Process Dynamics and Control, John Willy & Suns, 1989.
  18. G. F. Franklin, J. D. Powell, and A. Emami-Naeini, Feedback Control of Dynamic System, Prentice-Hall, 2002.