Three phase time varying load

Question

Othman Alkandri 2022-7-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1755595-three-phase-time-varying-load

回答： Joel Van Sickel 2022-8-1

I am trying to do three pahse varying load with respect to time. I used singal builder to set the data of my load, then I used varrying resistor to give the load singal to it. However I am revicing errors >>>

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Block 1: 'Unonlinearelement_Variable Resistor/SrcI' Block 2: 'phase_C: Three-Phase Source' The first block, modeled as a current source, cannot be connected in series with the inductive element of the second block. Add a high-value resistance in parallel with one of the two block. You can also specify high-value resistive snubbers if the blocks have a snubber device.You can avoid the use of the snubber by selecting the 'Continuous' simulation type in the Solver tab of the Powergui and deselecting the 'Disable ideal switching' option in the Preferences tab of Powergui block.

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Answer 1

Joel Van Sickel 2022-8-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1755595-three-phase-time-varying-load#answer_1019135

The issue is how your circuit is set up. You need a snubber resistor to ground (for all three phases) because you can't have two components modelled as current sources in series with each other. If you use Simscape instead of specialized power systems, you don't have to worry about this. (use the blue circuit components, not the black ones)

https://www.mathworks.com/learn/tutorials/circuit-simulation-onramp.html

Simscape also has variable three phase loads.

Regards,

Joel