Simulink integrator produces false result !

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Saeed Ahmadzadeh Mahboobi
评论： Saeed Ahmadzadeh Mahboobi 2021-2-11
Hello everyone
I have modeled and HVDC system in Simulink, and have implemented simple PI-controllers for the converters of the system.
The problem is:
I am giving a PI-Controller a signal (Gain parallel with an integrator block), which is nearly equal to zero (delta = 0), but the integrator and the PT1 block create a signal of a value around 3000 !! Doesn't matter if I change the PI-Controller parameters or not, the 3000 output will be there !!
(The given settings:
  1. Ki = 0
  2. Initial value of the Integrator = 0 )
As you can see, all the given values are 0, so how on earth is it possible that the output of the integrator block be something around 3000 ??
Could anyone help with that PLEASE ??
Thank you in advance
Below you can see my controlling loop and the simulation result:
  2 个评论
Jim Riggs
Jim Riggs 2021-2-11
The only thing I can think of is to check the integrator block to see if it has an initial value of ~3000.
Saeed Ahmadzadeh Mahboobi
Saeed Ahmadzadeh Mahboobi 2021-2-11
No !!!
The initial value is around 500, but even when I change it to 0, the 3000 doesn't change again !!
It looks like as if the out put has nothing to do with the initial condition....
But even so, WHY should there be 3000, whereas I set Ki equal to zero ?!!!!
(Thanks for the answer)

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