Method and system for formulating an energy-saving strategy for semi-automatic production line based on model predictive control

An energy-saving strategy formulation system for a semi-automatic production line based on model predictive control, comprising:

• an algebra modeling module;
• an optimization module;
• a solution module;
• an iteration module;
• a strategy generation module;
• and
• a strategy execution module;
• wherein the algebra modeling module is configured for constructing the max-plus algebra model of the semi-automatic production line, wherein the semi-automatic production line comprises work-in-process (WIP) products and an automated device;
• and the max-plus algebra model is a production line model without controlling start and stop of the automated device;
• the optimization module is configured for establishing an optimization objective function with the WIP products as discrete elements, and a sleep start moment and a sleep end moment of the automated device as control variables based on the max-plus algebra model;
• the solution module is configured for substituting a first unoptimized WIP product among the WIP products into the optimization objective function, solving the optimization objective function to obtain an optimal sequence comprising the sleep start moment and the sleep end moment of the automated device, and outputting a first set of values in the optimal sequence as an optimization result for the first unoptimized WIP product with respect to the automated device;
• the iteration module is configured for performing functions of:
• determining whether all of the WIP products in the semi-automatic production line have been optimized;
• and
• if not, treating the optimization result as a disturbance information, and incorporating the disturbance information into the construction of the max-plus algebra model;
• the strategy generation module is configured for generating an energy-saving strategy based on optimization results corresponding to all of the WIP products in the case that all of the WIP products in the semi-automatic production line have been optimized;
• and
• the strategy execution module is configured for controlling the automated device based on the energy-saving strategy.