1. A method for real-time electronic control of a plant, the method comprising: obtaining output signals representing parameter values of the plant; determining, by an MPC controller, an integral-state vector based at least in part on the output signals and set point values associated with the output signals; determining, by the MPC controller with a prediction model, a future output value and a future state value of the plant based at least in part on the output signals, a current state vector of the plant, and the integral-state vector, the prediction model including an integral-state equation; and generating, by the MPC controller, a plant control signal based at least in part on a performance index associated with the prediction model, the performance index including an integral-state cost term, wherein the determined plant control signal corresponds to a minimum value of the performance index.