10-04-2017, 08:23 PM
Seminar on Cascade Control
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Plant Disaster
Avarice Inc., a nearby chemical plant, recently experienced an OSHA recordable when their piping lines ruptured
Employees in the vicinity were scalded by the hot liquid expelled from the pipes
Detective Brainchild from the chemEPD was sent to investigate
Cascade Systems
Cascade Control Systems contain integrated sets of control loops
Primary Loop: Monitors the control variable and uses deviation from its setpoint to provide an output to the secondary loop.
Secondary Loop: Receives its setpoint from the primary loop and controls the reference variable accordingly.
Benefits of Cascade Control
Effectively accounts for external disturbances
Reduces dead time in variable response
Compatible with other Control Systems, such as Feed-Back and Feed-Forward Control Architectures.
Disadvantages of Cascade Control
Multiple control loops make physical and computational architecture more complex
Additional controllers and sensors can be costly.