MATLAB: How to correctly measure transformer flux

Simscape Electrical

I can either use a Multimeter Block and select the flux as output, or I can attach voltmeters to the terminals of the transformer and integrate the voltage to get flux. These two measurements are different yet both seem correct. Why is there a difference and how do I correctly measure transformer flux?

Best Answer

The multimeter output is the correct flux measurement. It measures flux based on the internal magnetization voltage of the transformer, and takes into account terminal losses due to impedance (R1 and L1 elements).

To approximate the correct flux via terminal voltage integration, several steps have to be applied.

1) Ensure the initial condition of the integrator block matches the initial flux measurement

2) Decrease R1 and L1 values to 0 to ensure the transformer is ideal, which means there are no internal losses, and the terminal voltage matches the magnetization voltage.

It is recommended to use the multimeter output for flux, as it integrates the internal voltage and automatically derives the correct initial conditions. For more information, see:

https://www.mathworks.com/help/physmod/sps/powersys/ref/lineartransformer.html

Related Solutions

MATLAB: Do I receive an error when I use the multimeter block with a signal from a linear transformer when using the Power Systems Blockset

This problem is solved in Power System Blockset 2.3 (R13).

If you are using an earlier version of the Blockset, this is a bug with the Multimeter block and the Linear Transformer block. The problem occurs only under some particular situation. If you open the model and if you point the mouse to the multimeter block, Simulink will show you the parameters of the block. You should read certain values for the "sel" and "L" parameters

This setting is correct. The two values are used to set an internal Selector block inside the multimeter. The paramater "sel" is the selected signals and "L" is the total number of available signals. Now start the simulation then, after the error message, point again the mouse to the multimeter block. The parameters are now different.

The L parameter is not correct, it was not properly updated by Power System Blockset.

As a workaround for Power System Blockset 2.2 (R12), you can modify a line in the code of the MATLABROOT/toolbox/powersys/powersys/private/psbsort.m function:

lines 583 to 588 of psbsort are:

% Internal measurement popup. 

          switch mesurerequest{i}; 
          case {'Magnetization current','All voltages and currents'} 
              mI{end+1} = ['Imag: ', nomdebloc]; 
              Tmp0406{end+1,1}=size(psb.rlc,1); 
          end

there is one missing line. it must be :

% Internal measurement popup. 
          switch mesurerequest{i}; 
          case {'Magnetization current','All voltages and currents'} 
             YiMultimeter{size(YiMultimeter,1)+1,1}=['I_b',num2str(size(psb.rlc,1)),';']; 
              mI{end+1} = ['Imag: ', nomdebloc]; 
              Tmp0406{end+1,1}=size(psb.rlc,1); 
          end

MATLAB: How can we connect a motor by uisng igbts in simscape

Hi Maheswari,

You can refer to the links below in order to create a Motor in Simscape.

https://www.mathworks.com/help/physmod/sps/ug/example-modeling-a-dc-motor.html

https://www.mathworks.com/videos/modeling-a-dc-motor-68852.html

Hope this Helps !

Best Answer

Related Solutions

MATLAB: Do I receive an error when I use the multimeter block with a signal from a linear transformer when using the Power Systems Blockset

MATLAB: How can we connect a motor by uisng igbts in simscape

Related Question