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More ways to prevent integral windup #34

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@antoine-sac

It'd be very beneficial to provide more ways to prevent integral windup, besides the limit of the integral term.

Among others, there are 2 very simple but effective methods: back-calculation (or tracking) and conditional integration (or clamping).

Both are similar in that they modify the integrator behaviour when the command output is saturating. See for example https://cse.lab.imtlucca.it/~bemporad/teaching/controllodigitale/pdf/Astrom-ACC89.pdf for a reference.

Conditional integration is particularly easy to implement : if the output is saturating (i.e. output is beyond output_limits), then we simply skip the integral term update.

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