MV line: loss fraction at STC

What it is

The resistive loss of the medium-voltage line from the inverter transformers to the HV transformer or the injection point, at the system's reference power, as a fraction. It is applied once to the system total.

Typical values and how to get it

From the line length, cross-section and voltage; collection lines are commonly designed for 0.5 % to 1 % at full power. If not given: 0: no medium-voltage line loss.

How it is applied

$$P_{\text{loss}}(t) = \frac{f_{MVL}\,P_{ref,sys}}{\text{PF}^2}\left(\frac{P_{sys}(t)}{P_{ref,sys}}\right)^2$$

where

Symbol	Meaning	Unit
$P_{\text{loss}}(t)$	the loss of the timestep	W
$f_{MVL}$	this input as a fraction	—
$P_{ref,sys}$	the system's AC reference power, the sum over the inverters	W
$\text{PF}$	the power factor	—
$P_{sys}(t)$	the system's inverter output, or with the cascade reference the power after the MV transformers	W

API

ac_losses.mv_line_loss_at_stc — sent as a fraction 0–1

Symbols follow the symbol registry.