Asymmetric Load

Note

Loads should always have a positive p_mw value, since all power values are given in the consumer system. If you want to model constant generation, use a Static Generator (asymmetric_sgen element) instead of a negative load.

Create Function

Input Parameters

net.asymmetric_load

Parameter

Datatype

Value Range

Explanation

name

string

name of the load

bus *

integer

index of connected bus

p_a_mw*

float

\(\geq 0\)

Phase A active power of the load [MW]

p_b_mw*

float

\(\geq 0\)

Phase B active power of the load [MW]

p_c_mw*

float

\(\geq 0\)

Phase C active power of the load [MW]

q_a_mvar*

float

Phase A reactive power of the load [MVar]

q_b_mvar*

float

Phase B reactive power of the load [MVar]

q_c_mvar*

float

Phase C reactive power of the load [MVar]

sn_mva

float

\(>0\)

rated power of the load [MVA]

scaling *

float

\(\geq 0\)

scaling factor for active and reactive power

in_service*

boolean

True / False

specifies if the load is in service.

type*

String

wye/delta

Connection Type of 3 Phase Load (wye/delta connected)

*necessary for executing a power flow calculation.

Note

  • The apparent power value sn_mva is provided as additional information for usage in controller or other applications based on panadapower. It is not considered in the power flow!

  • ‘wye’ is the same as PH-E loads

  • For ‘delta’ loads line-earth voltages and powers are converted to line-line values

Electric Model

Loads are modelled as PQ-buses in the power flow calculation.

Wye Load

alternate Text

Delta Load

alternate Text

Even though power values are entered as Line-ground \(P_{a},Q_{a}\), for delta loads, Power values are actually line-line powers i.e. \(P_{ab},Q_{ab}\)

So, in the algorithm :

Line-ground voltages \(V_{a}\) are converted to line-line voltages \(V_{ab}\). Line-Line currents are then converted to Line-ground currents \(I_{a}\).

\(I_{a}= T. \frac{S_{ab}}{(V_{an}-V_{bn})}\)

\(I_{b}= T. \frac{S_{bc}}{(V_{bn}-V_{cn})}\)

\(I_{c}= T. \frac{S_{ca}}{(V_{cn}-V_{an})}\)

Where

alternate Text

Result Parameters

net.res_asymmetric_load

Parameter

Datatype

Explanation

p_a_mw

float

resulting Phase A active power demand after scaling and after considering voltage dependence [MW]

q_a_mvar

float

resulting Phase A reactive power demand after scaling and after considering voltage dependence [MVar]

p_b_mw

float

resulting Phase B active power demand after scaling and after considering voltage dependence [MW]

q_b_mvar

float

resulting Phase B reactive power demand after scaling and after considering voltage dependence [MVar]

p_c_mw

float

resulting Phase C active power demand after scaling and after considering voltage dependence [MW]

q_c_mvar

float

resulting Phase C reactive power demand after scaling and after considering voltage dependence [MVar]