How can i plot short circuit current Iccafter performing dynamic simulation ?

answered 2022-03-15 14:05:36 -0500

perolofl
3777 ●1 ●9 ●24

The problem here is that PSSE doesn't have any channel for fault current monitoring, or not even to plot a branch current.

However, the fault current can be plotted with the following method:

1. Split the faulted bus, in my example bus 154 in savnw network is split and a zero impedance line (ZIL) is inserted to the new bus 254.

2. Add a branch-MVA channel for the line between bus 154 and 254. Add a bus voltage channel for bus 154.

3. Perform a dynamic simulation and apply the fault at the new bus, 254. The total fault current will then go through the branch from bus 154 to 254.

After simulation, use a formula to plot the following: branchMVA / (Vpu*Vbase) / sqrt(3). In the following example the fault is applied at time = 0.5 and cleared at time = 0.6 s. The curve shows the bus fault current, i,e, the current flowing through line 154 - 254.

The inital fault current is above 16.5 kA and the current declines during the fault to about 13 kA.

answered 2022-03-10 15:16:47 -0500

jconto
2851 ●11 ●33 ●42

A set of channels (a.k.a study variables) can be plotted within the PSSe GUI after opening an OUT file. The plotting features are still crude but its drag-and-drop feature is very useful. You can also use PSSPLT, a tool in the PSSe installation to do plotting. Check its manual and search for it on this forum. A channel data can be exported to excel and be plotted there. Check for "channel export" in the forum.

A python script to do plotting using the module dyntools (part of PSSe installation) is an option. Check the demo code 'dyntools_demo.py' available in the folder 'example', part of the PSSe installation.

About the case IEEE9bus system, search the forum for "Does anyone have IEEE 9 and IEEE39 dyr files?" where a link will take you to my public google site. The updated IEEE9bus system contains scripts to run fault runs (with composite load models) and simple script-driven plotting. You may check "channels.py", my other tool for plotting.