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.

KiranChalla

asked 2023-10-23 13:38:31 -0500

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Can you show the DYRE record?

perolofl (2023-10-23 14:46:54 -0500) edit

I have added my dyre file in the answer as I cant add it here as a comment

KiranChalla (2023-10-23 15:21:48 -0500) edit

What disturbance are you simulating?

perolofl (2023-10-23 17:02:48 -0500) edit

the disturbance is a 100ms 3-phase fault at bus 13

KiranChalla (2023-10-23 17:09:35 -0500) edit

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The 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.

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jconto

answered 2023-10-24 14:24:31 -0500

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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      /

KiranChalla

answered 2023-10-23 15:21:13 -0500

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The 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/6nYGYDC

boat14

answered 2023-11-21 11:41:06 -0500, updated 2023-11-21 11:41:28 -0500

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How to add a CMLDBLU2 or CMLDBLDGU2 with low power rating (<5MW) edit

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