Central plant control system with equipment maintenance evaluation

A control system for cost optimal operation of an energy facility including equipment covered by a maintenance contract, the control system comprising:

• equipment configured to operate during an optimization period;
• and
• a controller configured to:
• obtain a cost function that defines a cost of operating the energy facility over the optimization period as a function of one or more setpoints for the equipment;
• modify the cost function to include a maintenance cost term that defines a maintenance cost as a function of a rate variable and an equipment usage variable;
• simulate the cost of operating the energy facility over the optimization period at each of a plurality of different values of the rate variable, the plurality of different values of the rate variable defining a plurality of different maintenance costs per unit of the equipment usage variable;
• select a value of the rate variable that results in a lowest cost of operating the energy facility over the optimization period;
• perform an online optimization of the cost function with the rate variable set to the selected value to generate the one or more setpoints for the equipment;
• and
• operate the equipment during the optimization period in accordance with the one or more setpoints generated by performing the online optimization.