Youim's profile - activity

You can import your system (.raw) file into powerworld to change the base MVA, and export it back in .raw file for PSSE

Hi,

I am trying to create dynamic models (generator, exciter, stabilizer, and governor) for four generators connected to a microgrid. The information for two generators with large capacity are not available so I have to make some assumption for Pgen and Qgen.

How would you create dynamic models for an unknown generator? The goal of my study is to observe the dynamic response of the loads connected to those generators so using GENCLS is not sufficient.

Thank you so much!

Thank you so much, jconto!

Thank you, jconto! But, every time I type command IMD in PSS/E command box, I get "Invalid activity".

Hi,

I would like to determine the parameters for my induction machine (CIM6BL) using the induction motor (IMD) program in PSS/E. But, I have no luck finding the instruction for how to use IMD. Can someone please help giving me the instruction for how to open/use it?

Thanks!

Hi, I added a user-define model (CMLDBLU1) to savnw.dyr, and everything works fine with PSSE version 34. But, I get error with version 33 (as shown below) and keep getting NaN for all of my outputs. I looked at the user manual for both versions, but I couldn't find any difference. Would someone please help me run my .dyr file on version 33 and point out my mistake? Also, what does the last line of the machine initial condition (1 0.0 0.000E+00 0.0000E+00) mean? Thanks!

link to my .dyr file: https://www.dropbox.com/sh/gcqetsi7pp...

INITIAL CONDITION LOAD FLOW USED 10 ITERATIONS

----------------------------- MACHINE INITIAL CONDITIONS -----------------------------

BUS# X-- NAME --X BASKV ID ETERM EFD POWER VARS P.F. ANGLE ID IQ

101 NUC-A       21.600 1  1.0111 2.1268  766.57  109.31 0.9900  62.83 0.6961 0.4894
102 NUC-B       21.600 1  1.0111 2.1268  766.57  109.31 0.9900  62.83 0.6961 0.4894
206 URBGEN      18.000 1  1.0383 2.6138  842.16  597.67 0.8155  23.52 0.8821 0.4596
211 HYDRO_G     20.000 1  1.0310 1.6570  616.80   36.58 0.9982  42.30 0.4536 0.6910
3011 MINE_G      13.800 1  1.0325 1.3944  287.71   68.67 0.9727  18.30 0.1531 0.2421
3018 CATDOG_G    13.800 1  1.0359 3.0400  105.32   82.19 0.7884  22.12 0.8984 0.4206
1   0.0                                     0.0000E+00     0.0000E+00

INITIAL CONDITIONS SUSPECT:

  I   DSTATE(I)    STATE(I)     MODEL             STATE     BUS# X-- NAME --X BASKV  ID
 84  -0.70458E-02  0.10569      CMLDBLU1           K+20      153 MID230      230.00  1
 85  -0.70458E-02  0.10569      CMLDBLU1           K+21      153 MID230      230.00  1

I am still be new to python and PSSE (this is my second weeks of learning them). Can I do sensitivity run on the gui? If not, is there any tutorial or sample code that I can learn from? Thanks!

I am not sure if I am allowed to share dyr data online. Anyway, I tried my dyr file on version 33 today and I didn't get "Dynamic Terminated" error so there may be some limitation of version 34. But, I run into another issue which I get NaN for all of my outputs. Thank you for your help, jconto!

I am using version 34. The setup runs fines, and I have no issue adding a composite load model to one bus. But, I get the "Dynamic Terminated" error when I add the load model to three buses. Is it because of the limit numbers of CONs for version 34? Thanks!

Hi,

Is there a way to disable and enable a motor in the composite load model (CMLDBU1) during dynamic simulation? I would like to observe the changes in the system due to machine stalling and recovery. CMLDBU1 is a user-written model that represent motors, power electronics, and static load.

Any comment/suggestion, I'll be really appreciated it :)

Thanks!

I am new to PSSE so I am starting with savnw.sav and modify savnw.dyr to get familiar with it before moving to a 250-bus network. I am trying to add composite load models (CMLDBLU1) to three load buses. But, I get an error saying "Return to Dynamics terminated--system model requires too many." The dynamic simulation runs fine after getting this error. Is it something I need to be aware of? Can anyone help me to remove this error?

Below is the output I get after loading .dyr file:

Generator models use:

CONS 1- 82 STATES 1- 35

Excitation System models use:

CONS 83- 144 STATES 36- 53 VARS 1- 3

Turbine Governor models use:

CONS 145- 177 STATES 54- 63 VARS 4- 8

Shared Load Characteristic models use:

CONS 178- 573

Return to Dynamics terminated--system model requires too many Unshared Load models use:

STATES 64- 144 VARS 9- 300 ICONS 1- 96

SUMMARY OF MODELS READ:

GENS: GENROU GENSAL 5 1

EXSYS: IEEET1 SCRX SEXS 3 1 2

GOVS: TGOV1 HYGOV 3 1

USER: USRLOD 3

NEXT AVAILABLE ADDRESSES ARE: CON STATE VAR ICON 574 145 301 97

Compile models not supplied by PSS/E and create user dll