Matlab to Caspoc parameter export introduction.

In Matlab you can calculate parameters and use these parameters in a simulation example that you can start in Caspoc. Both exporting the parameters in a file and starting Caspoc can be done from the same m script. Important is that in the xml file the parameters are exported exactly as shown in the examples below, in Caspoc you have to specify the filename:name with a colon : in between!

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Below is a simple example of simulation of a motor drive system, where the Power of the motor and the power factor of the motor are specified in a Matlab script and exported into a Caspoc simulation.

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Below an example xml file is shown

<?xml version="1.0" encoding="ISO-8859-1"?>
	<datamodel>
        <data>
            <parameters>
                <parameter name="1">
                    <name>MotorM01.cosphi</name>
                    <value_si>0.98</value_si>
                    <description>Power factor</description>
                </parameter>
                <parameter name="2">
                    <name>MotorM01.P</name>
                    <value_si>20000</value_si>
                    <description>Nominal power of the motor</description>
                </parameter>
            </parameters>
        </data>
    </datamodel>

In library blocks you can directly specify the filename:name combination to get he parameters. Belwo an example how to get the parameters Kabel01.L Kabel01.R Kabel01.X from the file intelec.xml

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Matlab script for exporting the parameters to Caspoc Example:Download example RunCaspoc.m
Example:Download example buck.csi

% Demonstration m script to run Caspoc from Matlab
% 1	Calculate parameters 
% 2	Export xml parameter file
% 3	Call Caspoc.exe
%
Vin=10; % Fixed in the simulation
% dutycycle equals 0.5 and is fixed in the simulation
Vout=0.5*Vin;
% Set the output power equal 5 Watt
Pout=5;
Iout=Pout/Vout;
% load resistance R
R=Vout/Iout;
% output capacitance 100uF
C=100e-6;
% inductor is set to 100uH
L=100e-6;
% open file and write parameters
fileID = fopen('buck.xml', 'w');
%fprintf(fileID,'Exponential Function\n\n');
%fprintf(fileID,'%6.2f %12.8f\n', R,C);
fprintf(fileID,'<?xml version="1.0" encoding="ISO-8859-1"?>\n');
fprintf(fileID,'<datamodel>\n');
fprintf(fileID,'<data>\n');
fprintf(fileID,'<parameters>\n');
fprintf(fileID,'<parameter name="1">\n');
fprintf(fileID,'<name>R</name>\n');
fprintf(fileID,'<value_si>%f</value_si>\n',R);
fprintf(fileID,'<description>resistance</description>\n');
fprintf(fileID,'</parameter>\n');
fprintf(fileID,'<parameter name="2">\n');
fprintf(fileID,'<name>L</name>\n');
fprintf(fileID,'<value_si>%f</value_si>\n',L);
fprintf(fileID,'<description>inductance</description>\n');
fprintf(fileID,'</parameter>\n');
fprintf(fileID,'<parameter name="3">\n');
fprintf(fileID,'<name>C</name>\n');
fprintf(fileID,'<value_si>%f</value_si>\n',C);
fprintf(fileID,'<description>capacitance</description>\n');
fprintf(fileID,'</parameter>\n');
fprintf(fileID,'</parameters>\n');
fprintf(fileID,'</data>\n');
fprintf(fileID,'</datamodel>\n');
fclose(fileID);
% Call Caspoc
system('c:\data\programs\caspoc2017\Caspoc2017.exe buck.csi &');

This will produce the following parameter file

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The following line in the matlab script runs Caspoc and simulates the file buck.csi

% Call Caspoc
system('c:\data\programs\caspoc2017\Caspoc2017.exe buck.csi &');

Buck converter

Matlab script for exporting the parameters to Caspoc Example:Download example RunCaspoc.m
Example:Download example buck.csi

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Power system load parameters

Matlab script for exporting the parameters to Caspoc Example:Download example grid.m
Example:Download example grid.csi

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To export results from the Caspoc simulation back to Matlab, the matlab command system() is expanded with \matlab

% Call Caspoc
system('c:\data\programs\caspoc2017\Caspoc2017.exe buck.csi /matlab &');

Two files are generated when the simulation in Caspoc is finished:

1. filename_results.m
   Contains all system block output values, electric circuit voltages and currents in Caspoc
2. filename_scope.mat
   Contains all simulation results from the scopes in Caspoc

If the results from the Caspoc simulation have to be post-processed in Matlab, you have to wait inside the matlab script until Caspoc is ready and returned the *_results.m file. In the script you can load this file and post-process the data. The prefix for the data in the file is

• y_XXXXX
  Output from a block diagram block XXXXX
• v_XXXXX
  Voltage over component XXXXX
• i_XXXXX
  Current through component XXXXX

% Call Caspoc and wait until Caspoc is finished before continuing the matlab script
system('c:\data\programs\caspoc2017\Caspoc2017.exe buck.csi /matlab');