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

asked 2020-02-18 04:40:00 -0600

Arkadipta gravatar image

updated 2020-02-18 05:55:52 -0600

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/

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answered 2020-02-18 12:05:31 -0600

perolofl gravatar image

updated 2020-02-21 00:15:42 -0600

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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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 gravatar imageArkadipta ( 2020-02-18 21:03:05 -0600 )edit

Have you reduced the time step?

perolofl gravatar imageperolofl ( 2020-02-18 23:22:42 -0600 )edit

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

Arkadipta gravatar imageArkadipta ( 2020-02-18 23:46:12 -0600 )edit

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

perolofl gravatar imageperolofl ( 2020-02-19 00:58:38 -0600 )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 gravatar imageArkadipta ( 2020-02-19 06:02:44 -0600 )edit

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Asked: 2020-02-18 04:40:00 -0600

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Last updated: Feb 21 '20