Synchronous Machine Salient Pole Edf_base

What are the equations to calculate Efd_base and Ifd_base of non-reciprocal p.u system in Synchronous Machine Salient Pole model / Electrical/ Simscape?

I don't understand where the value of Efd_base comes from according to the model

Field circuit base values, Efd, Ifd (exciter model, non-reciprocal pu system):

v = 73.1018 : V % Instantaneous voltage

i = 1000 : A % Instantaneous current

Best regard

Miguel Montilla

Answer 1

[Balavignesh]

Hi Miguel,

As per my understanding, you want to know what are the equations that are used to calculate base values of field voltage ‘efd’ and currents flowing in the field circuit ‘ifd’.

As per the documentation of Synchronous Machine Salient Pole Block, the following equation is used to calculate field voltage ‘efd’.

Currents flowing in the field circuit ‘ifd’ must be set in the block parameters. It will be set as 1000 A by default.

I hope this helps resolve the issue you are facing.

[Miguel Montilla-DJesus]

Thank you !!

This equation is for the fundamental parameters. Very well !!! Thaks again.....but

What is it for standard parameters?

Best regard

Miguel

[Balavignesh]

Hi Miguel Montilla,

As per my understanding, you mean standard per unit-parameters as standard parameter.

As per the documentation of Synchronous Machine Salient Pole Block, the Park transformation is used to define the per-unit synchronous machine equations.

I hope this answers your queries.

Answer 2

[Miguel Montilla-DJesus]

Ok

What is it for standard parameters?

Best regard

Answer 3

[Miguel Montilla-DJesus]

Dear Belavignesh

I will try to explain what I am doing.

I have placed the standard parameters (in p.u) in the synchronous generator block:

Ra=0.04; Xl=0.15; Xd=1.05; Xq=0.7;X0=0.15; Xd'=0.35; Xd''=0.25; Xq''=0.325; Tdo'=5.25; Tdo''=0.03; Tqo''=0.05;

When I search for the associated base values with "Display Associated Base Values". I find this:

Rotor base values:

wMechanical = 37.6991 : rad/s % Mechanical angular speed

torque = 2.65258e+06 : N*m % Torque

Field circuit base values, Efd, Ifd (exciter model, non-reciprocal pu system):

v = 73.1018 : V % Instantaneous voltage

i = 1000 : A % Instantaneous current

The next step is to find the fundamental parameters (in p.u) from the above standard parameters and place them in the synchronous generator block:

Lad=0.9; Laq=0.55; L0=0.15; Ra=0.04; Lfd=0.2571; Rfd=5.8465e-4; L1d=0.2; R1d=0.0354; L1q=0.2567; R1q=0.0425;

Again I look for the base values associated with "Display Associated Base Values" I find this:

Rotor base values:

wMechanical = 37.6991 : rad/s % Mechanical angular speed

torque = 2.65258e+06 : N*m % Torque

Field circuit base values, Efd, Ifd (exciter model, non-reciprocal pu system):

v = 72.1791 : V % Instantaneous voltage

i = 1000 : A % Instantaneous current

Why are the Efd values bases different? Are the equations to calculate them different?

Best regard

Miguel