# How to change induction machine power consumption during dynamic simulations?

Hello all,

I have a IEEE 39 bus case with some induction machine loads (CIM5BL). In the raw file, they are modeled as constant power loads, with corresponding entries in the dyr file.

I am trying to change the power consumption of these induction machine loads during dynamic simulations. Previously, when i intended to do this, i just stopped the simulations, used the following command: ierr = psspy.loadchng5()

And then continued the simulation.

But this does not seem to work for these induction loads. Do i have to do this using the CIM5BL vars instead?

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Change the nominal load torque in VAR(L+4). The nominal torque is calculated at STRT and stored in VAR(L+4).

In python, use for example:

psspy.change_ldmod_var(IBUS,ID,"CIM5BL",5, 0.85)


to change the nominal load torque to 0.85 pu.

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