What is the N coefficient filter in simulink?

What is the N coefficient filter in simulink? What effect does it have on the PID controller?

[Rodrigo Arcanjo]

processamento de sinal - Coeficiente do Filtro MATLAB PID - Stack Overflow

Answer 1

[Vaibhav Awale]

Hi Rikke,

Please refer to this post:

http://www.mathworks.com/matlabcentral/answers/63762-filter-coefficient-n-in-pid-block

The filter coefficient is used to implement derivative action. Since implementing something like "Kd*s" is not possible since implementing improper transfer function is not possible. Hence instead of "Kd*s", we do something like:

Kd*(N*s/(s+N)).

So if N is sufficiently large, it tends to "Kd*s"

Hope this helps.

[José Miguel Riquelme Domínguez]

Hi Vaibhav, I have the following question: how can implement in Simulink a PID expressed like this? I'm not able to put it in Simulink's form. Thanks for your help,

José Miguel

[MYO ZIN AUNG]

You can use Simulink Transfer Function Block.

Answer 2

[SASANK DAS]

Can I give filter cofficient as N=2000, which will giving good indcutor current response for my buck converter, rather than using N=100(which will producing more noice)