derivative block doesn't answer correctly.

Question

Hamid Ghaedi 2017-11-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/366401-derivative-block-doesn-t-answer-correctly

评论： Hamid Ghaedi 2017-11-13

i have an equation system noted down. my input "y1ref" and "y2ref" comes from a block and with the equations below, the "y1dot" and "y2dot" are calculated. (2 equations are separated and k11,k21,k22 are constant gains) using of derivative made may answers infinite numbers in some points. how can i prevent this from happening(for example how to turn equation to integrator?) i appreciate the help

the simulated sustem

2 个评论
显示无隐藏无

Birdman 2017-11-11

Can you share the model(Export to r2015a) and all necessary variables?

Hamid Ghaedi 2017-11-13

Change_Of_Reactive_Load.zip

yes of course. here is the model

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Yogananda Jeppu 2017-11-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/366401-derivative-block-doesn-t-answer-correctly#answer_290543

You require a set of integrator. Your input is ddot(Y2ref) and dot(Y1ref). Use integrator in series to get ddot(Y2ref)->dot(Y2ref)-> Y2ref and dot(Y1ref)->Y1ref. Construct the equation dot(y1) and ddot(y2). Use the integrator in series to get y1, dot(y2) and y2. Use these equations back on the ddot(y2) and dot(y1). This is better than differentiating.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Hamid Ghaedi 2017-11-13

Change_Of_Reactive_Load.zip

thanks Mr.jeppu but i think that's not correct. my inputs are y1 y2 y1ref and y2ref and the output are y1dot and y2ddot(second derivative) (my apologies because i gave the wrong input in my question.) now,based on these in/outputs how can i got outputs without any problem?

here is the model i'm working on. on>signal>FBC subsytem.

thanks for your help again.

请先登录，再进行评论。