Python for PSSE help forum - Individual question feedhttp://psspy.org/psse-help-forum/questions/A community for Power Systems Engineers to ask and answer questions about Pythonenwhit loves you. Tue, 21 Nov 2023 11:41:06 -0600How to add a CMLDBLU2 or CMLDBLDGU2 with low power rating (<5MW)http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/ I was working on the dynamic simulation of the IEEE 14 bus system with composite load models at all buses. The IEEE 14 bus test case has a load of 3.5MW on the 11th bus which is less than 5MW. While simulating this case I got a log report stating that "CMLDBLU2 At bus 11 LOAD 1 Ignored because real power= 3.5000 is less than threshold value of 5.00 MW". Is there any way to consider a composite load (CMLDBLU2/CMLDBLDGU2) with a power rating of less than 5MW? If yes, what changes are required to do that? Please help me to solve this situation.Mon, 23 Oct 2023 13:38:31 -0500http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/Comment by KiranChalla for <p>I was working on the dynamic simulation of the IEEE 14 bus system with composite load models at all buses. The IEEE 14 bus test case has a load of 3.5MW on the 11th bus which is less than 5MW. While simulating this case I got a log report stating that "CMLDBLU2 At bus 11 LOAD 1 Ignored because real power= 3.5000 is less than threshold value of 5.00 MW". Is there any way to consider a composite load (CMLDBLU2/CMLDBLDGU2) with a power rating of less than 5MW? If yes, what changes are required to do that? Please help me to solve this situation.</p>
http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?comment=10441#post-id-10441the disturbance is a 100ms 3-phase fault at bus 13Mon, 23 Oct 2023 17:09:35 -0500http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?comment=10441#post-id-10441Comment by perolofl for <p>I was working on the dynamic simulation of the IEEE 14 bus system with composite load models at all buses. The IEEE 14 bus test case has a load of 3.5MW on the 11th bus which is less than 5MW. While simulating this case I got a log report stating that "CMLDBLU2 At bus 11 LOAD 1 Ignored because real power= 3.5000 is less than threshold value of 5.00 MW". Is there any way to consider a composite load (CMLDBLU2/CMLDBLDGU2) with a power rating of less than 5MW? If yes, what changes are required to do that? Please help me to solve this situation.</p>
http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?comment=10440#post-id-10440What disturbance are you simulating?Mon, 23 Oct 2023 17:02:48 -0500http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?comment=10440#post-id-10440Comment by KiranChalla for <p>I was working on the dynamic simulation of the IEEE 14 bus system with composite load models at all buses. The IEEE 14 bus test case has a load of 3.5MW on the 11th bus which is less than 5MW. While simulating this case I got a log report stating that "CMLDBLU2 At bus 11 LOAD 1 Ignored because real power= 3.5000 is less than threshold value of 5.00 MW". Is there any way to consider a composite load (CMLDBLU2/CMLDBLDGU2) with a power rating of less than 5MW? If yes, what changes are required to do that? Please help me to solve this situation.</p>
http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?comment=10439#post-id-10439I have added my dyre file in the answer as I cant add it here as a commentMon, 23 Oct 2023 15:21:48 -0500http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?comment=10439#post-id-10439Comment by perolofl for <p>I was working on the dynamic simulation of the IEEE 14 bus system with composite load models at all buses. The IEEE 14 bus test case has a load of 3.5MW on the 11th bus which is less than 5MW. While simulating this case I got a log report stating that "CMLDBLU2 At bus 11 LOAD 1 Ignored because real power= 3.5000 is less than threshold value of 5.00 MW". Is there any way to consider a composite load (CMLDBLU2/CMLDBLDGU2) with a power rating of less than 5MW? If yes, what changes are required to do that? Please help me to solve this situation.</p>
http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?comment=10437#post-id-10437Can you show the DYRE record?Mon, 23 Oct 2023 14:46:54 -0500http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?comment=10437#post-id-10437Answer by boat14 for <p>I was working on the dynamic simulation of the IEEE 14 bus system with composite load models at all buses. The IEEE 14 bus test case has a load of 3.5MW on the 11th bus which is less than 5MW. While simulating this case I got a log report stating that "CMLDBLU2 At bus 11 LOAD 1 Ignored because real power= 3.5000 is less than threshold value of 5.00 MW". Is there any way to consider a composite load (CMLDBLU2/CMLDBLDGU2) with a power rating of less than 5MW? If yes, what changes are required to do that? Please help me to solve this situation.</p>
http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?answer=10476#post-id-10476The restriction comes from the Dynamic Simulation Options under the "Thresholds" tab. Not the dyr file.
Off the PSS/e menu bar:
Dynamics > Simulation Options
See the screenshot:
https://ibb.co/6nYGYDCTue, 21 Nov 2023 11:41:06 -0600http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?answer=10476#post-id-10476Answer by jconto for <p>I was working on the dynamic simulation of the IEEE 14 bus system with composite load models at all buses. The IEEE 14 bus test case has a load of 3.5MW on the 11th bus which is less than 5MW. While simulating this case I got a log report stating that "CMLDBLU2 At bus 11 LOAD 1 Ignored because real power= 3.5000 is less than threshold value of 5.00 MW". Is there any way to consider a composite load (CMLDBLU2/CMLDBLDGU2) with a power rating of less than 5MW? If yes, what changes are required to do that? Please help me to solve this situation.</p>
http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?answer=10445#post-id-10445The model CMLDxx does not have restriction on the size of the load to be applied to. Some 'CMLDxx writing' package (NERC has one, other) may have a restriction of Pl > 5.0 MW, which can be user-modified.Tue, 24 Oct 2023 14:24:31 -0500http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?answer=10445#post-id-10445Answer by KiranChalla for <p>I was working on the dynamic simulation of the IEEE 14 bus system with composite load models at all buses. The IEEE 14 bus test case has a load of 3.5MW on the 11th bus which is less than 5MW. While simulating this case I got a log report stating that "CMLDBLU2 At bus 11 LOAD 1 Ignored because real power= 3.5000 is less than threshold value of 5.00 MW". Is there any way to consider a composite load (CMLDBLU2/CMLDBLDGU2) with a power rating of less than 5MW? If yes, what changes are required to do that? Please help me to solve this situation.</p>
http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?answer=10438#post-id-10438 Hi following is the dyre for 11th bus composite load model used in my simulation
11 'USRLOD' '1' 'CMLDBLU2' 12 1 2 133 27 146 48 0 0
-1.0000 0.0000 0.10000E-03 0.20000E-03 0.75000
0.80000E-01 1.0000 1.0000 1.0000 0.90000
1.1000 0.63000E-02 1.0250 1.0400 30.000
5.0000 0.0000 0.0000 0.15000 0.15000
0.10000E-01 0.30000 0.20000 1.0000 0.70000
0.50000 -0.99700 2.0000 0.45200 1.0000
0.54800 0.0000 2.0000 -0.50000 1.0000
1.5000 -1.0000 3.0000 0.75000 0.40000E-01
1.8000 0.12000 0.10400 0.95000E-01 0.21000E-02
0.10000 0.0000 0.70000 0.20000E-01 0.20000
1.0000 99999. 0.50000 0.20000E-01 0.70000
0.85000 0.10000 3.0000 0.75000 0.30000E-01
1.8000 0.19000 0.14000 0.20000 0.26000E-02
0.50000 2.0000 0.60000 0.20000E-01 0.20000
0.75000 0.50000E-01 0.50000 0.20000E-01 0.30000
0.85000 0.50000E-01 3.0000 0.75000 0.30000E-01
1.8000 0.19000 0.14000 0.20000 0.26000E-02
0.10000 2.0000 0.65000 0.20000E-01 0.20000
1.0000 9999.0 0.50000 0.20000E-01 0.30000
0.85000 0.10000 0.33300E-01 0.30000 0.25000E-01
0.50000E-01 1.0000 0.98000 0.45000 0.10000
0.10000 0.0000 0.0000 1.0000 6.0000
2.0000 12.000 3.2000 11.000 2.5000
0.86000 0.20000 0.95000 1.0000 -3.3000
0.50000 0.40000 0.60000 0.50000 15.000
0.70000 1.9000 0.10000 0.60000 0.20000E-01
0.90000 9999.0 0.80000 /
Mon, 23 Oct 2023 15:21:13 -0500http://psspy.org/psse-help-forum/question/10436/how-to-add-a-cmldblu2-or-cmldbldgu2-with-low-power-rating-5mw/?answer=10438#post-id-10438