Exponential and Polynomial/ZIP Single phase load in simulink

Question

Haroon Zafar 2021-9-17

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https://ww2.mathworks.cn/matlabcentral/answers/1455589-exponential-and-polynomial-zip-single-phase-load-in-simulink

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.

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Joel Van Sickel 2021-9-20

Harron,

what is your question?

Regards,

Joel

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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Answer 1

Joel Van Sickel 2021-9-22

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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.