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Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
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Optimization control of a 330 MW drum boiler unit based on DMC algorithm and DEB strategy.

Dongming Zhang1, Yong Hu1, Yaokui Gao1

  • 1State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, 102206 Beijing, China; Key Laboratory of Measurement and Control New Technology and System for Industrial Process, North China Electric Power University, Changping District, 102206 Beijing, China.

ISA Transactions
|November 14, 2021
PubMed
Summary

This study introduces a new coordinated control system (CCS) for a 330 MW drum boiler, improving energy utilization and control accuracy. The system enhances boiler performance under varying load conditions by addressing internal and external disturbances.

Keywords:
Coal-fired drum boiler unitCoordinated control system (CCS)Direct energy balance (DEB)Dynamic matrix control (DMC)

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Area of Science:

  • Engineering
  • Control Systems
  • Power Generation

Background:

  • Accurate modeling of power plant components like drum boilers is crucial for effective control system design.
  • Existing control strategies may struggle with internal and external disturbances, impacting efficiency and stability.
  • Direct Energy Balance (DEB) strategy offers a framework for managing boiler energy but requires enhancement.

Purpose of the Study:

  • To develop a nonlinear dynamic model of a 330 MW drum boiler unit.
  • To propose and validate a Coordinated Control System (CCS) integrating Dynamic Matrix Control (DMC) and DEB strategy.
  • To improve the tracking of grid dispatch orders and enhance control performance under various load conditions.

Main Methods:

  • Established a physically meaningful nonlinear dynamic model for a 330 MW drum boiler.
  • Calculated the boiler energy storage coefficient and analyzed its relation to the DEB strategy.
  • Developed a CCS using DMC, incorporating DEB signals as setpoints/process values and a novel compensation signal for feedforward control.

Main Results:

  • The proposed CCS effectively overcomes internal boiler disturbances and external turbine disturbances.
  • A constructed compensation signal, considering multiple unit parameters, significantly improves control accuracy compared to traditional methods.
  • Practical application demonstrated excellent grid dispatch order tracking with minimal main steam pressure deviation (±0.6 MPa constant pressure, ±1.2 MPa sliding pressure).

Conclusions:

  • The developed nonlinear dynamic model and CCS provide a robust framework for boiler control.
  • The integrated DMC and DEB strategy with a novel compensation signal enhances boiler energy utilization and stability.
  • The system significantly improves control performance across high, medium, low, and overall load conditions, meeting grid requirements.