Algebraic Loop Error in simulink

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Sivakumar S 2021-5-1

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评论： Sivakumar S 2021-5-8

I'm trying to simulate a field-oriented controlled induction motor fed from an SVPWM inverter and DC Source. Please help me with this error in magnitude-angle to complex block from simulink math operations library.

I tried to reduce the relative tolerance parameter from 1e-4 to a lower value, and I also tried using a trust region-based algorithm for the algebraic loop solver. Neither of the approaches worked.

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Answer 1

Shiva Kalyan Diwakaruni 2021-5-4

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Hi,

The above error is occuring during algebraic loops which occur when an input port with direct feedthrough is driven by the output of the same block, either directly, or by a feedback path through other blocks which have direct feedthrough.

Algebraic loops are discussed in the Simulink User's Guide, available at the following URL:

http://www.mathworks.com/help/simulink/ug/simulating-dynamic-systems.html

For suggestions on how to resolve a continuous algebraic loop, please refer to the following post:

http://blogs.mathworks.com/simulink/2015/07/18/why-you-should-never-break-an-algebraic-loop-with-with-a-memory-block/

Hope it helps.