# \#variable-resistor

**URL:** https://forum.plexim.com/tag/variable-resistor/646.md

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## [How to avoid algebraic loop when use variable load under external mode](https://forum.plexim.com/t/how-to-avoid-algebraic-loop-when-use-variable-load-under-external-mode/1368)

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**Author:** [@W.shawn.D](https://forum.plexim.com/u/W.shawn.D)\
**Replies:** 1\
**Last updated:** [June 6, 2024, 1:30pm UTC](https://forum.plexim.com/t/how-to-avoid-algebraic-loop-when-use-variable-load-under-external-mode/1368 "2024-06-06T13:30:10Z")

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Hi I made a three-phase grid-tied inverter integrated with pv & bess model, and using “from file” block to import solar irradiation and variable load value in 24 seconds, under simulation everything is fine, controller …

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## [Solving algebraic loop due to variable resistor in 3-LVL-ANPC under different modulation strategies](https://forum.plexim.com/t/solving-algebraic-loop-due-to-variable-resistor-in-3-lvl-anpc-under-different-modulation-strategies/1311)

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**Author:** [@THK](https://forum.plexim.com/u/THK)\
**Replies:** 3\
**Last updated:** [February 8, 2024, 10:55am UTC](https://forum.plexim.com/t/solving-algebraic-loop-due-to-variable-resistor-in-3-lvl-anpc-under-different-modulation-strategies/1311 "2024-02-08T10:55:50Z")

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Hello, I would like to investigate different modulation strategies for a 3-LVL-ANPC-SiC topology under different operating points in terms of overall efficiency and power dissipation (temperature) per switch. To genera…