Page 310 - Power Electronic Control in Electrical Systems

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298 Transient studies of FACTS and Custom Power equipment

5. To save the circuit just created, select the SAVE AS option from the pull down
menu found in the FILE box located near the top left of the Draft window. Save
the current file as `sys_1'.
6. Select the COMPILE option to compile the circuit. Provided the circuit has been
properly created, the message: Compile complete 0 error(s), 0 warning(s) should
appear in the bottom box.
7. Use either the QUIT or ICON options to exit the Draft window.
After the circuit schematic diagram has been completed, the transient simulation is
performed using the module RunTime Executive. The RunTime Executive
palette allows the user to customize the appearance of the console and to show as
many waveform outputs as required. Also, control devices such as sliders, push-
buttons and dials, can be opened for interactive control of the simulation.
8.3.3 Transient simulation using RunTime Executive

1. Start the RunTime Executive by selecting it from the corresponding box in the
File Manager.
2. Use the LOAD option in the BATCH pull down menu to load the file `sys_1'.
3. Select the PLOT option in the CREATE pull down menu to create the plots. Use
graph 1 to display the line voltage, graph 2 to display the load current and graphs
3 and 4 to display the active and reactive power respectively.
4. Push the PLAY button to start the simulation. While the simulation is running, it is
possible to click the [A/S] icon at the right-hand side of the plot to auto scale the graph.
5. Once the simulation has finished the window looks similar to the one shown in
Figure 8.9. This figure shows the waveforms of the line voltage V ab at the
secondary of the transformer, the line current in phase a, I a , the active power P,
and the reactive power Q.
6. Use either the ICON or QUIT options to minimize or exit RunTime Executive
respectively.
It should be noted that while the simulation is in progress, it may be paused, single-
stepped through or restarted, using the tape recorder type buttons on the menu bar
located immediately above the graphs. Also, cursors and zoom in-out features are
available for closer inspection of the traces.
8.3.4 Plotting and analysis of results using MultiPlot

1. Select the MultiPlot module in the File Manager. The window must look
similar to the one shown in Figure 8.10.
2. Create an empty graph using the pull down option in the CREATE menu.
3. Position the mouse on the empty graph, click the right button in the mouse and
select ADD CURVE from the options presented in the menu box.
4. Select the desired signal you wish to display.
At the end of the simulation session, the File Manager window should look like the
one shown in Figure 8.11. It shows the icons for the various files created for a given
simulated circuit. To end the session, close down all the applications, e.g. Draft,
RunTime Executive and MultiPlot, and then press the QUIT button.