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Cascade Control

Paper type: Essay
Pages: 2 (483 words)
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Downloads: 46
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Cascade control is a powerful extension of conventional 3 Cascade control is a powerful extension of conventional 3-term feed term feed back – control control. It is a strategy which compensates for specific disturbances at source and largely Prevents them from affecting process being controlled. A cascade control scheme has two controllers, the output of the master controller being used to adjust the set point of the slave controller The effect of steam pressure disturbances can be compensated for using a slave The effect of steam pressure disturbances can be compensated for using a slave flow control loop.

The set point of the flow control loop u M is manipulated by the level controller output. If the level h is too low the set point of the flow loop will be increased, and vice versa. The flow loop controls the flow of water F w agaiinst this set point in the normal way. Again, suppose that the pressure in the drum Ps suddenly increases, perhaps due to a transient drop in steam load F perhaps due to a transient drop in steam load Fs , causing the flow of water to causing the flow of water to decrease.

The flow loop will respond quickly by opening the valve to maintain the water flow water flow F at the rate demanded by the level controller In effect the flow loop is at the rate demanded by the level controller. In effect, the flow loop is insulating the level loop from, or rejecting disturbances due to, changes in steam pressure. Temperature control of a reactor or tank via flow of a heating medium (or cooling medium): TICreactor > FICheat medium > Valve heat medium ? Temperature control of the inner reactor temperature via slave controller for the jacket temperature, sometimes with subordinated controller for heating- and cooling medium flow (multi cascade! :TICreactor > TICjacket > FICheat medium > Valve heat medium Often in combination with split-range at the slave controller because of heating and cooling. ? Temperature control of a furnace via slave controller for fuel flow (or combustion gas pressure): TICoven > FICfuel > Valve fuel. ? Level control of a tank via slave controller for feed- and/or drain flow: LICtank > FICdrain > Valve drain.

Temperature control of a distillation column (master controller) via reflux ratio (slave controller at column head) or vapor flow (slave controller column bottom). Position control (drive technology) as a multi cascade structure with slave controllers for revolution speed and torque. Note Generally slave controllers for flow are applied to avoid that control objectives of the master controller are disturbed by flow fluctuations. Furthermore, typical nonlinearities of the flow actuator (e. g. the valve) are “hidden“ in the slave control loop, because the closed slave control loop shows a linear behaviour. This way, nonlinearities of the valve have no effects on the master control loop and its controller design.

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Cascade Control. (2020, Jun 01). Retrieved from https://studymoose.com/cascade-control-new-essay

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