## Answers

Sep 01, 2016 - 08:11 AM

Dear Jagath,

I am using PSCAD v4.2.1 but as far as i know, the PMSG block is the same in v4.2.1 and v 4.5.4.

Answer to Q1: you have to implement dynamics of rotor including Inertia and Damping factor parameters externally. to find out more, pls go to foder which you have installed PSCAD, examples, PM machine, PM machine.psc

beside power circuit, there is a control system which models the rotational dynamics of the rotor. you can enter Angular Moment of Inertia (J=2H), and Mechanical Damping as illustrated on that example.

Answer to Q2: follow the above mentioned path (PM machine example), as u can see all parameters are in p.u.. the blocks modeling the rotational dynamics of the rotor are also in p.u. and there is no need to enter actual data. if you need mechanical rotating speed in rad/s : [Mechanical speed = W(pu)*2*pi*f/(pole pairs)].

Answer to Q2: As mentioned above, when you convert Mechanical speed (rad/s) to W(pu) ro vice versa, you should enter number of pole pairs.

Hope this helps,

regards,

M.Tahmasbi

I am using PSCAD v4.2.1 but as far as i know, the PMSG block is the same in v4.2.1 and v 4.5.4.

Answer to Q1: you have to implement dynamics of rotor including Inertia and Damping factor parameters externally. to find out more, pls go to foder which you have installed PSCAD, examples, PM machine, PM machine.psc

beside power circuit, there is a control system which models the rotational dynamics of the rotor. you can enter Angular Moment of Inertia (J=2H), and Mechanical Damping as illustrated on that example.

Answer to Q2: follow the above mentioned path (PM machine example), as u can see all parameters are in p.u.. the blocks modeling the rotational dynamics of the rotor are also in p.u. and there is no need to enter actual data. if you need mechanical rotating speed in rad/s : [Mechanical speed = W(pu)*2*pi*f/(pole pairs)].

Answer to Q2: As mentioned above, when you convert Mechanical speed (rad/s) to W(pu) ro vice versa, you should enter number of pole pairs.

Hope this helps,

regards,

M.Tahmasbi

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