1. A method of controlling an energy delivery system, the method comprising: providing an energy management system (EMS) having an automatic generation control (AGC) system including a load frequency control (LFC) module; executing two or more performance standard functions implemented within the LFC module using input data regarding the energy delivery system, wherein at least one of the performance standard functions is defined to be dependent upon another of the performance standard functions; and implementing corrections to the operation of the energy delivery system based upon solution results of executing the performance standard functions.