主汽压力控制品质与燃料量变化约束关系定量分析

  目的]  以风电为代表的可再生能源规模化并网造成火电机组发电负荷指令大幅频繁变化，调试协调控制系统参数时需要在汽轮机前主蒸汽压力控制品质与燃料量变化幅度之间做出权衡。  方法]  从简单一阶惯性对象着手，依次增加积分、纯迟延、非最小相位特性，逐步推导出典型对象调节时间同控制器输出的最大调节量之间约束关系的公式。  结果]  进一步结合火电机组协调控制系统机侧控制回路闭环情况下锅炉燃料量与机前压力对象模型，得到描述发电负荷指令扰动下机前压力变化与燃料量变化间约束关系的公式。  结论]  通过仿真实验结果和机组实际运行数据的验证，该公式准确性能够满足实用要求。

Quantitative Analysis on the Constraint Relationship Between the Control Quality of Throttle Pressure and the Variation of Fuel Quantity

  Introduction]  The large-scale grid connected of renewable energy represented by wind power results in frequent changes of generation load command in the thermal power unit. The debugging of coordinated control system parameters cannot satisfy the control quality of throttle pressure and the variation of the fuel quantity simultaneously.  Method]  Based on the simple first order inertial object, adding the integral, pure delay and non minimum phase characteristics in turn, the constraint relation between the adjustment time of the typical objects and the maximum output of the controller was summarized gradually.  Result]  Combined with the model of the boiler fuel quantity and the throttle pressure in the case of closed-loop control of the turbine-side in coordinated control system for thermal power unit, a formula is presented to describe the constraint relationship between the change of throttle pressure and fuel quantity under the disturbance of generation instruction.  Conclusion]  The simulation results and actual operation data verify the accuracy of the formula which can meet the practical requirements.