Buildings.Controls.Continuous.Examples
Collection of models that illustrate model use and test models
Information
This package contains examples for the use of models that can be found in Buildings.Controls.Continuous.
Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).
Package Content
| Name | Description |
|---|---|
 LimPID
|
Test model for PID controller with optional reverse action |
| LimPIDWithReset
|
Example that demonstrates the controller output reset |
| NumberOfRequests
|
Example model for block that outputs the number of requests |
| OffTimer
|
Example model for off timer |
| SignalRanker
|
Example model for signal ranker |
Buildings.Controls.Continuous.Examples.LimPID
Test model for PID controller with optional reverse action
Information
This model tests the implementation of the
PID controller with optional reverse action.
The model limPIDOri is the original
implementation of the controller from the Modelica
Standard Library. The models limPID
and limPIDRev are the implementations
from the Buildings library. The model
limPIDRev is parameterized to have
reverse action.
The assertion blocks test whether the results
of all three controllers are identical.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
Buildings.Controls.Continuous.Examples.LimPIDWithReset
Example that demonstrates the controller output reset
Information
Example that demonstrates the effect of the integrator reset. The top model has the reset of the controller output enabled. By plotting the controller error, one sees that the integrator reset improves the closed loop performance slightly. Note, however, that both controllers have an integrator anti-windup and hence the integrator reset has limited benefits.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
Buildings.Controls.Continuous.Examples.NumberOfRequests
Example model for block that outputs the number of requests
Information
Example that demonstrates the use of the block Buildings.Controls.Continuous.NumberOfRequests. The parameters of the block are such that the output is incremented for each input signal that is strictly larger than 0. The figure below shows the inputs and the output of the block.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
Buildings.Controls.Continuous.Examples.OffTimer
Example model for off timer
Information
Example that demonstrates the use of the model
Buildings.Controls.Continuous.OffTimer.
The input to the two timers are alternating boolean values.
Whenever the input becomes false(=0), the timer is reset.
The figures below show the input and output of the blocks.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
Buildings.Controls.Continuous.Examples.SignalRanker
Example model for signal ranker
Information
Example that demonstrates the use of the signal ranker model.
The figure below shows the input and output signals of the block.
Note that
sigRan.y[1] ≥ sigRan.y[2] ≥ sigRan.y[3].
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
Buildings.Controls.Continuous.Examples.LimPIDWithReset.Plant
Plant model
Information
Plant model for Buildings.Controls.Continuous.Examples.LimPIDWithReset. consisting of a simple heat transfer model.
Implementation
To compare the effect of the controller output reset, the plant and control models have been implemented in separate blocks so they can be instantiated twice in the system model with the appropriate control settings.
Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).
Connectors
| Type | Name | Description |
|---|---|---|
| input RealInput | Q_flow | Heat flow rate added to system [W] |
| output RealOutput | T | Controlled temperature [K] |
Modelica definition
Buildings.Controls.Continuous.Examples.LimPIDWithReset.Controller
PID controller with optional output reset
Information
Controller model for Buildings.Controls.Continuous.Examples.LimPIDWithReset.
The controller is reset whenever the input signal becomes bigger than 30°C.
Implementation
To compare the effect of the controller output reset, the plant and control models have been implemented in separate blocks so they can be instantiated twice in the system model with the appropriate control settings.
Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Reset | reset | Buildings.Types.Reset.Disabled | Type of controller output reset |
Connectors
| Type | Name | Description |
|---|---|---|
| input RealInput | TSet | Temperature set point [K] |
| input RealInput | u_m | Measured temperature [K] |
| output RealOutput | y | Control signal |