J
Hi .
I am modeling a sodium steam generator in Octave. I build a set of differential equations and solve them with Octave DAE solver. My model works just fine. Now i would like to start implementing controls but I am quite confused with P controller output signal and with what it actually controls
For example: I am trying to control the level of water in the boiler. Measured value is 4-20mA signal that represents water level. What I want to control is valve that throttles the Feed water dpump discharge.
I implemented a control equation:
t= time
l= water level [m]
l_set =required water level [m]
f=Kp*(e)=Kp*(l_set-l(t)).
I know that the The characteristic of the valve is linear (4mA(0% open) - 20mA(100% open)).
What is the relation between value f and the signal that i send to the valve. Do I send the f to the valve?? That does not seem right since when e=0 then f=0 I would be telling the valve to shut to 0% open when the error is 0.(neglect the 4mA signal...I can add bias) That is not right or is it??
How can I model this problem with a differential or algebraic equation??
Thank you
Jacob
I am modeling a sodium steam generator in Octave. I build a set of differential equations and solve them with Octave DAE solver. My model works just fine. Now i would like to start implementing controls but I am quite confused with P controller output signal and with what it actually controls
For example: I am trying to control the level of water in the boiler. Measured value is 4-20mA signal that represents water level. What I want to control is valve that throttles the Feed water dpump discharge.
I implemented a control equation:
t= time
l= water level [m]
l_set =required water level [m]
f=Kp*(e)=Kp*(l_set-l(t)).
I know that the The characteristic of the valve is linear (4mA(0% open) - 20mA(100% open)).
What is the relation between value f and the signal that i send to the valve. Do I send the f to the valve?? That does not seem right since when e=0 then f=0 I would be telling the valve to shut to 0% open when the error is 0.(neglect the 4mA signal...I can add bias) That is not right or is it??
How can I model this problem with a differential or algebraic equation??
Thank you
Jacob
