The integration of complete replanning and rule-based repairing for optimal operation of utility plants

The integration methodology of complete replanning and plan repairing is pr oposed to handle the prediction errors for energy demands during multiperio d operational planning. Complete replanning is implemented periodically and plan repairing is triggered during the execution interval. The plan repair ing is constructed by a rule-based system because of real-time limitations. The efficiency index of a utility pump is introduced to determine startup/ shutdown of equipment without integer programming in plan repairing. Case s tudies show that the proposed method is more profitable than the convention al replanning method. The total operating costs are, reduced by 0.3-9.0% co mpared with the conventional replanning method.