PRT Load Shedding Concerns

In a power reeovery train, a breaker trip is one of the more eomplex problems that is experieneed. An algorithm that models the train s 

ALGORITHM FOR FCCU POWER RECOVERY TRAIN BREAKER TRIP RECOVERY  

As previously mentioned in Chapter 5, one of the most severe disturbances for the power recovery train (PRT) is a generator breaker opening. This event often causes the PRT to trip on overspeed or other process or machine conditions. A control solution has been developed to keep the PRT and the process under control during breaker opening. 

A PRT in an FCCU significantly increases total plant efficiency. In practice, many PRTs are not operated at their design capacity. Generally, two categories of problems prohibit users from getting the maximum out of their PRT  

To get good control of the entire PRT, not only should the expander be controlled, but a completely integrated control system for this application should be designed. Most conventional control systems consist of individual control loops that only consider their specific tasks. The PRT—from a control perspective—is a multivariable system that requires integration between the different control loops. Further, some of the disturbances on the PRT are so fast that closed-loop control is too slow to keep the train under control. 

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