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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

Abstract

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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Acknowledgement

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

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