In a field oriented control of a motor we need 3 PI regulators in a control system, one is for mechanical system and two are for electrical system
for a good dynamic response and low torque ripple we should tune PI regulators with machine and inverter parameter( switching frequency)
Dear Mehdi, you have different time constants of control paths: (1) mechanical system with speed control, (2) torque system with active power control und (3) exciter system with reactive power control. This time constants are deduced from machine parameters. Normally the machine parameters are non-linear and they are altering with the magnetic saturation. Then you should the machine parameters measure or alternative the time constants simulate.
dear christian E.jacob
tanx for your answer, at first i consider that the machine parameters are measured and the machine is linear,for example we have Ld and Lq( d and q axis magnetizing inductance ) , Rs( stator resistance) and Fs( inverter switching frequency )and ofcourse interia moment of rotor and viscous friction coefficient, with this parameter is there any reference to find the PI regulators parameter?
best regards
it is very detailed and i can't bring you a whole advanced answer to you but briefly i can say that a parallel feed back and a series one for estimating the current and the voltage like it was in a UPFC can help you
Dear Mehdi, a holistic approach at measurement and deduce of parameters you can find (only in German) by Prof. Mrugowsky. We use his equations for examination of paralleling of flywheel generators.
http://www.amazon.de/Drehstrommaschinen-Inselbetrieb-Modellbildung-Parametrierung-Simulation/dp/product-description/3834816094/ref=dp_proddesc_0?ie=UTF8&n=299956&s=books
dear ata yadghar
tanx for your guidance, i will check it up
best regards
dear christian E.jacob
i should read that book, tank you
best regard
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