Voltagevalt

Voltagevalt is a hypothetical metric used in electrical engineering discussions to quantify the sensitivity of a power system's voltage to disturbances or load changes. The term blends voltage with a suffix that suggests a measurable value. There is no universally accepted definition; various authors propose definitions that share common features: it is typically a dimensionless quantity derived from measured or simulated voltage data V(t) at one or more nodes, normalized by the system's nominal voltage Vnom, and expressed over a chosen time window or event.

One common definition: voltagevalt = max_t (max_i |V_i(t) - Vnom| / Vnom), i.e., the largest relative voltage deviation observed during a disturbance, across all monitored buses. An alternative, continuous form: voltagevalt = (1/Δt) ∫_t0^t1 |V(t) - Vnom| / Vnom dt, representing the average relative deviation over the disturbance period. The choice of window and bus set influences results.

Purpose and use: It is used heuristically to compare robustness of grids, controllers, or scenarios. A higher voltagevalt indicates larger voltage excursions and potentially greater risk of voltage instability or failure. It complements other metrics such as voltage sag duration, unbalance, and short-term voltage stability indices.

Limitations: Because definitions vary, voltagevalt is not a standardized metric; results depend on data quality, timing, and bus selection. See also voltage stability, voltage sag, and power quality. Some authors treat voltagevalt as a theoretical construct rather than a practical engineering measure.