I want to simulate three phase grid tied inverter and i need transfer function of three phase inverter so that i can find kp and ki parameters to control output of inverter using siso tool.
As far as I know, tuning of controllers is mostly hit and trail. I for example did by selecting a small Kp and Ki and tried it.
okay but which transfer function should i take for three phase grid tied inverter application in siso tool?
If you are considering the inverter an "Ideal inverter". Means you are not considering the internal inductance, resistance, and capacitance of the switches. Than you can just take the transfer function of the output filter, and find the suitable values of the compensator for stable response using Matlab.
you can consult following book:
electric motor and drives by r krishnan... d/l it from
http://een.iust.ac.ir/profs/Arabkhabouri/Electrical%20Drives/Books/R.%20Krishnan-Electric%20Motor%20Drives_%20Modeling,%20Analysis,%20and%20Control%20(2001).pdf
Hi Sagar. It's up to which response criterion do you want to use developing your inverter. If you're interested, I can search on my clipboards about converter's Laplace's domain transfer functions.
I am trying to simulate three phase grid tied inverter using simulink and I know the basic block diagram of current controller and how it works. If I want to design inverter with current controller so how to find kp and ki values to make plant stable?
Hi, I suggest you this book:
"VOLTAGE-SOURCED CONVERTERS IN POWER SYSTEMS: Modeling, Control and Applications". by Dr. Yazdany and Prof. Iravani.
it is well written and useful.
As per the context of your question, I assume you are talking about the conventional 6 switch IGBT/MOSFET based Three-Phase two level inverter devoid of any Low Pass Passive filter circuit (LC, RLC, LCL, etc.)
The transfer function roughly comes out to be K/(1+sT) where K is the gain and T is the delay time. You can drive it using the relationship between the Fundamental Line voltage Output and the input DC voltage.
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