This paper proposes a coordinated control system (CCS) for a coal-fired drum boiler unit based on precise energy balance (PEB) and direct energy balance (DEB) strategies. Firstly, considering the boiler energy storage is extremely complex, this paper proposes a drum boiler model with clear physical meaning. Based on the model, the boiler energy storage is further tested and analyzed. Secondly, considering several key parameters, a PEB strategy for feedforward control is proposed. Combined with the DEB strategy and load command (LDC) reconstruction, the CCS of the unit is designed. Simulation results show that the PEB strategy can achieve precise feedforward control, the LDC reconstruction can greatly improve the evaluation indicators of the unit load, and the CCS can adapt well to changes in coal quality and boiler energy storage. Application results show that the unit load can track its set point well under small and large ranges of load swing. The ramp rate is up to 13.2MW/min, the load accuracy is less than 1.2MW/min, the response time is less than 22s, and the comprehensive indicator is up to 4.35. Therefore, the CCS can be highly adapted to the dispatching demand of power grid. In addition, the boiler combustion is stable, the max deviations of steam pressure and temperature are 0.7MPa and 6.4°C, respectively.

本文提出了一种基于精确能量平衡（PEB）和直接能量平衡（DEB）策略的燃煤鼓式锅炉机组协调控制系统（CCS）。首先，考虑到锅炉的储能非常复杂，本文提出了一种具有明确物理意义的鼓式锅炉模型。基于该模型，对锅炉储能进行了进一步的测试和分析。其次，考虑了几个关键参数，提出了一种前馈控制的PEB策略。结合DEB策略和负荷指令（LDC）重建，设计了该装置的CCS。仿真结果表明，PEB策略可以实现精确的前馈控制，LDC重构可以大大提高单位负荷的评估指标，CCS可以很好地适应煤质和锅炉储能的变化。应用结果表明，在小范围和大范围的负载摆幅下，单位负载都能很好地跟踪其设定点。斜率高达13.2MW / min，负载精度小于1.2MW / min，响应时间小于22s，综合指标高达4.35。因此，CCS可以高度适应电网的调度需求。此外，锅炉燃烧稳定，蒸汽压力和温度的最大偏差分别为0.7MPa和6.4°C。