关键词: 有限集模型预测控制, 火电机组, 凝结水泵, 状态反馈量, 价值函数, 变频控制方法

Abstract: In the face of complex and changing operating environment of thermal power units, the demand for condensate water pump operation increases, but its stability is insufficient. A variable frequency control method for water pump motor based on finite control set model predictive control ( FCS-MPC) was studied. Value function and expected value were designed. By minimizing the value function as the objective function, the variable frequency control process can
be transformed into an optimization solution process. Using the moth to the flame optimization algorithm, the optimal control input that minimizes the value function was sought in the control input space, and applied to the condensate pump control system. Through the frequency converter, the variable frequency control of the condensate pump motor was achieved. The results indicated that the overshoot remained at a relatively low level at different times. The stability of the variable frequency control of the condensate pump motor was relatively good, and it can cope with the complex and changing operating environment of thermal power units.

Key words: finite control set model predictive control ( FCS-MPC ), thermal power unit, condensate pump, state feedback quantity, value function, frequency conversion control method