//! Physical units for energy systems modelling.
//!
//! All quantities use newtype wrappers to prevent unit confusion at compile time.
//! The inner `f64` stores the canonical SI-adjacent unit documented on each type.
//!
//! # Sub-modules
//! - [`electrical`] — Voltage (V), Current (A), Power (W), ReactivePower (VAr),
//! Impedance (Ω), Frequency (Hz), PerUnit
//! - [`thermal`] — Temperature (K), ThermalConductivity, HeatCapacity
//! - [`energy`] — Energy (Wh), Capacity (Ah), StateOfCharge [0, 1]
//! - [`conversion`] — `base_impedance()`, `base_current()` per-unit helpers
//!
//! ## Mathematical background
//!
//! Per-unit normalization converts physical quantities to dimensionless ratios:
//!
//! ```text
//! Z_pu = Z_actual / Z_base
//! Z_base = V_base² / S_base `Ω`
//! I_base = S_base / (√3 · V_base) `A` (three-phase)
//! Y_base = 1 / Z_base [S]
//! ```
//!
//! where S_base is the system MVA base and V_base is the line-to-line kV base.
//! All `PerUnit` conversions in this module follow these formulas.
pub use *;
pub use *;
pub use *;
pub use *;