Exponential and Polynomial/ZIP Single phase load in simulink

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Haroon Zafar
Haroon Zafar 2021-9-17
回答： Joel Van Sickel 2021-9-22
Dear All,
I am trying to implement a non liner voltage dependent load model. The load models are exponential and as well as polynomial.
For Instance:
Power = P0 (V/Vo)^np
I have trying to implement this as below:
I want to acheive a non linear (distorted sinewave) current draw as shown below to conduct load flow and harmonic studies.
  2 个评论
Haroon Zafar
Haroon Zafar 2021-9-20
Actually I am trying to model non linear load in Simulink. The load has exponential form to represent power dependency on input voltage.
Power = P0 (V/Vo)^np
I tried to implement this model as shown above using a controlled current source that is dependent on calculated power and input voltage ( I=P/V). I was expected a distorted sinusoidal output current to represent load behaviour. But instead I am getting something like this which is not a sinusoidal output.
Can you see any error in my simulink implementation?

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回答（1 个）

Joel Van Sickel
Joel Van Sickel 2021-9-22
your absolute value will prevent it from every being truly sinusoidal. The model is outputting exactly the math that you have implemented in Simulink. You need to find a different mathematical representation of your current waveform that does not require a divide by voltage since this is a single phase AC system and voltage will always cross 0.
I think the issue is that you are using a distortion model intended for three phase networks and doing them for a single phase network. If you did this with three phase values you should not have to divide by zero as V is not the instantaneous voltage of any phase, but the overal voltage magnitude of the system.

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