Abstract
Direct-energy-balance (DEB) based coordinated control strategy is critical in achieving good load following and steam pressure stability in modern power plant. Dealing with the adverse impact of perturbation in coal quality, however, is still a challenge to be resolved. In this paper, a 300MW drum-boiler unit model is first established and verified by experimental data, for the purpose of DEB and calorific value flexibility study. Unlike conventional measurement correction methods, the heat value variation is considered here as a part of the internal disturbance, which is estimated and compensated in an improved active disturbance rejection control (ADRC) structure. The proposed control strategy brings a novel design concept for a critical problem of heat variation in any coal-fired power plant. The simulation results demonstrate that the dynamic performance of main steam pressure can be significantly improved.
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