5.7. Response to Disturbances
Consider the block diagram in Figure 5-17, which has both setpoint and load disturbance signals. It is easy to derive the following closed-loop relationship:
Figure 5-17. Control block diagram including a load disturbance.
In our previous analysis we have been assuming that there is no load disturbance entering the process; that is, our concern has been with setpoint responses. In this section we analyze disturbance rejection (or the response to load disturbances) in detail.
Assume that there is no setpoint change, ...
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