Exclude branches collapsed by zero-impedance breaker merges#303
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acostarelli wants to merge 1 commit into
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Exclude branches collapsed by zero-impedance breaker merges#303acostarelli wants to merge 1 commit into
acostarelli wants to merge 1 commit into
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The implicit breaker-merge in Ybus construction can map both endpoints of a parallel non-breaker branch to the same surviving bus, producing a self-loop arc. This corrupted the incidence matrix and crashed _build_row_to_cols inside RadialReduction. Bundle the existing breaker merge and a new collapsed-branch sweep into _apply_implicit_reductions!. Flag collapsed branches via a skip set that _get_ybus_two_terminal_ac_branches consults, so they never enter the matrix. Also harden _build_row_to_cols to error on incomplete rows instead of returning uninitialized memory. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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