Enum DcApproximation 

pub enum DcApproximation {
    IgnoreR,
    IgnoreG,
}

Which terms the DC susceptance keeps.

Both variants are powsybl-open-loadflow’s DcApproximationType (dc/equations/AbstractClosedBranchDcFlowEquationTerm.computePower); no other reference tool offers the choice, and every one of them uses what is spelled IgnoreR here.

Variants

IgnoreR

b = 1/x. The textbook DC approximation, and what MATPOWER’s makeBdc, pandapower’s rundcpp and lightsim2grid all compute. Discards resistance entirely, which is the assumption the whole DC model rests on anyway.

IgnoreG

b = x/(r² + x²), i.e. −Im(y_series): the true series susceptance, with resistance retained in the denominator where it belongs.

Strictly the better linearization of the two — it is the exact coefficient of sin δ in the AC flow equation, whereas 1/x is that coefficient only in the limit r → 0. The gap is negligible on transmission (r/x ≈ 0.1 gives a 1% difference) and material on distribution feeders, where r/x can exceed 1. It is not the default only because every tool worth comparing against uses 1/x, and a default that silently disagrees with all of them would make every cross-check look like a bug.

Trait Implementations

impl Clone for DcApproximation

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for DcApproximation

impl Debug for DcApproximation

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for DcApproximation

fn default() -> Self

Returns the “default value” for a type.

impl Eq for DcApproximation

impl PartialEq for DcApproximation

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for DcApproximation