blockNormalizedTimeDelay
Calculate the normalized time delay of the response of a relay controller
Information
This block calculates the normalized time delay of the output from a relay controller.
τ = (γ - ρ)/(γ - 1)/(ρ*0.35+0.65),
where γ and ρ are the asymmetry level of
the relay controller and the half-period ratio, respectively.
Note: A delay block is used to maintain the in-tuning process status for a short period after the autotuning completed. It allows properly triggering the warning if the warning indeed should be triggered. The delay should remain small to avoid unintended dynamic effects on the system behavior.
References
J. Berner (2017). "Automatic Controller Tuning using Relay-based Model Identification." Department of Automatic Control, Lund University.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | delayTime | 0.1 | Delay time, used to trigger warning |
| Real | gamma | 4 | Asymmetry level of the relay controller |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | rho | Half period ratio | |
| Buildings.Controls.OBC.CDL.Interfaces.BooleanInput | inTun | Check if the tuning is ongoing | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput | tau | Normalized time delay |
Revisions
-
June 1, 2022, by Sen Huang:
First implementation.