Simulink control problem

[youan Li]

Dear all,

I already designed a PI controller in MATLAB/SIMULINK to control the valve of heating system in EnergyPlus. When I try to run both programs together, I get following error in MATLAB. 

Invalid setting for fixed-step size (900.0) in model 'controller'. All sample times in your model must be an integer multiple of the fixed-step size. 

The sample time period (1.0) of 'controller/controller/controller/Discrete PID Controller/Filter' is not an integer multiple of the fixed 

step size (900.0) specified for model.

I already make sure time-step in BCVTB is 15*60 and number of timestep per hour is 4. Is there anyone help me to solve this problem?

Thanks,

Youan

[youan Li]

Dear all, 

I already fix the problem. But now I get another.

The "FixedStepDiscrete" solver cannot be used to simulate block diagram 'controller' because it contains continuous states.

Is that means I need to change the continuous controller to be discrete? 

Thanks,

Youan

在 2017年5月26日星期五 UTC+2上午12:17:01，youan Li写道：

[Thierry Nouidui]

Why are you not using a variable time step (continuous) solver instead?

Thanks!

Thierry

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--------------------------------------
Thierry Stephane Nouidui, PhD

Simulation Research Group
Lawrence Berkeley National Laboratory
1 Cyclotron Road, MS 90R3147
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(510) 495-2337 voice
email: TSNo...@lbl.gov
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[youan Li]

Hello Thierry,

is that means I need to change Discrete Time Director to Continuous Time Director in BCVTB interface?

 

Thanks,

Youan

在 2017年5月26日星期五 UTC+2上午12:52:37，Thierry Nouidui写道：

Why are you not using a variable time step (continuous) solver instead?

Thanks!

Thierry

On Thu, May 25, 2017 at 3:35 PM, youan Li <youa...@gmail.com> wrote:

Dear all, 

I already fix the problem. But now I get another.

The "FixedStepDiscrete" solver cannot be used to simulate block diagram 'controller' because it contains continuous states.

Is that means I need to change the continuous controller to be discrete? 

Thanks,

Youan

在 2017年5月26日星期五 UTC+2上午12:17:01，youan Li写道：

Dear all,

I already designed a PI controller in MATLAB/SIMULINK to control the valve of heating system in EnergyPlus. When I try to run both programs together, I get following error in MATLAB. 

Invalid setting for fixed-step size (900.0) in model 'controller'. All sample times in your model must be an integer multiple of the fixed-step size. 

The sample time period (1.0) of 'controller/controller/controller/Discrete PID Controller/Filter' is not an integer multiple of the fixed 

step size (900.0) specified for model.

I already make sure time-step in BCVTB is 15*60 and number of timestep per hour is 4. Is there anyone help me to solve this problem?

Thanks,

Youan

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[Thierry Nouidui]

I don't get this quite. The BCVTB uses the SDF director. I was referring to the Simulink solver.

Thank!

Thierry

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[youan Li]

Hello Thierry,

 

I'm sorry to bother you again. I changed Simulink solver in  MATLAB. But there is another problem. BCVTB gives me feedback of connection reset. And the final result looks like only two points.

Thanks, 

Youan
在 2017年5月26日星期五 UTC+2下午9:51:19，Thierry Nouidui写道：

[Thierry Nouidui]

I don't know what is implemented in your controller but it seems to have an algebraic loop. I am also not that familiar with Simulink but know that t sometime needs the loop to be broken so the simulation can run. 

I suggest to do your controller development in Simulink first, see whether it can be run there, and then couple it with other tools through the BCVTB.

Thanks!

Thierry

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[youan Li]

Thanks for your suggestion.

Youan

在 2017年5月27日星期六 UTC+2上午12:05:54，Thierry Nouidui写道：