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I am making a model of a small power system, and I am wondering what I can use to represent a power load that shall vary with time. Can someone help me with this?

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Sebastian Castro
Sebastian Castro 2015-9-21

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Are you using SimPowerSystems? If so, there is a Three-Phase Dynamic Load block you can use. Alternatively, you can look at the example for this named power_dynamicload.
The above block lets you import a load profile from some external signal, in the form of active power (P) and reactive power (Q). Therefore, it does assume a balanced load. If you want to implement your own unbalanced load, you could always implement it using single-phase blocks like current or voltage sources.
As far as the data for the time-varying load itself, what are you looking at? Are you generating your own load profile, loading it from a file, something else?
- Sebastian

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Thank you! I have now implemented the three-phase dynamic load block in my system. I am quite knew to Matlab and Simulink, so I am not completely sure how to go on. The load block, together with a model for a power turbine, go into a Matlab function block, where I am calculating what the generating power from the power turbine should be. I think that I want to set the values for the load block in a Matlab script. Is this possible? And is it necessary to have some kind of input on the phases A, B and C at the left of the load block?

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