How to start an induction motor during the running of simulation of a model?

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I am trying to create an induction motor model in a system. I followed the PAGV2 document file for the dynamic data of the motor. With the induction motor already in the system the initialization is done successfully and the system is working properly. However, in case I am trying to TURN ON a motor during the running of the model, it is not happening. The power output of that motor is always showing as '0'. Please help.

In the .dyr file, I have give the following details for induction motor dynamic model: 1 'CIM5BL' 1 1 0 0.01 4 0.01 0.1 0 0 0 0 0 0 0 1.25 1 0 .001 .001 1 .87/

Arkadipta

asked 2020-02-18 04:40:00 -0500, updated 2020-02-18 05:55:52 -0500

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For the Speed Dev you have in the plot above, is it based off of VARs L+3 (delta w) of the CIM5BL model or a different parameter? Thanks

LSilv

answered 2023-03-07 17:15:25 -0500

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When doing a motor start the Mbase of the motor must be specified (CON(J+11). You have entered 0, so you are starting a 0 MVA motor! The load is switched off in load flow and its size (MW,Mvar) has no importance at motor starting.

If you enter e.g. Mbase = 10 MVA and Tnom is 0.87, you will start a motor with 8.7 MW nominal load. The motor will start in the dynamic simulation when the load status is changed to 1.

An example of motor start is shown below, motor speed and torque are plotted. The motor is started at T=0.5 s. image description

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perolofl

answered 2020-02-18 12:05:31 -0500, updated 2020-02-21 00:15:42 -0500

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Thank you for the information. I tried it but the just after the load status is changed to 1, the simulation resulted in NAN. What can be the possible reason behind this?

Arkadipta (2020-02-18 21:03:05 -0500) edit

Have you reduced the time step?

perolofl (2020-02-18 23:22:42 -0500) edit

No. I haven't done anything like that. The time step is at is is, equal to 0.01 secs.

Arkadipta (2020-02-18 23:46:12 -0500) edit

Try shorter time step, e.g. 1 ms.

perolofl (2020-02-19 00:58:38 -0500) edit

Thank you. It's working now. However, can you please clarify why a shorter time step is required for this induction motor modelling? Knowing the reason may be helpful for other simulations in the near future.

Arkadipta (2020-02-19 06:02:44 -0500) edit

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How to start an induction motor during the running of simulation of a model? edit

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