Fossil Plant Control Systems Applications with the Modular Modeling System Code

A dynamic model of the MSUS standard coal-fired unit was developed using EPRI´s Modular Modeling System (MMS) code. A simplified control system model was used to help reveal the need for more sophisticated control strategies. The control system was also designed for operation in either a constant throttle pressure or a sliding throttle pressure control mode. Transient results showed that reheat steam temperature and drum level deviations from setpoint exceeded control system preliminary design specifications in both control modes. Further studies are needed to determine if these results were due to control system tuning, control system structure, or plant capacity limitations. A number of other areas for potential applications of MMS were cited.