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.

See also

Unit Systems and Conventions

Create Function

pandapower.create.create_asymmetric_load(net, bus, p_a_mw=0, p_b_mw=0, p_c_mw=0, q_a_mvar=0, q_b_mvar=0, q_c_mvar=0, sn_mva=nan, name=None, scaling=1.0, index=None, in_service=True, type='wye', **kwargs)

Adds one 3 phase load in table net[“asymmetric_load”].

All loads are modelled in the consumer system, meaning load is positive and generation is negative active power. Please pay attention to the correct signing of the reactive power as well.

Parameters:

  • created (**net** - The net within this load should be)

  • **bus** (int)

  • **p_a_mw** (float, default 0)

  • **p_b_mw** (float, default 0)

  • **p_c_mw** (float, default 0)

  • float (**q_b_mvar**)

  • load (default 0) - The reactive power for Phase B)

  • float

  • load

  • **q_c_mvar** (float, default 0)

  • (float (**scaling**) – NaN) - Nominal power of the load

  • default – NaN) - Nominal power of the load

  • (string (**type**) – None) - The name for this load

  • default – None) - The name for this load

  • (float – 1.) - An OPTIONAL scaling factor to be set customly

  • default – 1.) - An OPTIONAL scaling factor to be set customly

  • phases. (Multiplies with p_mw and q_mvar of all)

  • (string – wye) - type variable to classify three ph load: delta/wye

  • default – wye) - type variable to classify three ph load: delta/wye

  • (int (**index**) – None) - Force a specified ID if it is available. If None, the index one higher than the highest already existing index is selected.

  • default – None) - Force a specified ID if it is available. If None, the index one higher than the highest already existing index is selected.

  • **in_service** (boolean)

  • net (pandapowerNet)

  • bus (int | integer)

  • p_a_mw (float)

  • p_b_mw (float)

  • p_c_mw (float)

  • q_a_mvar (float)

  • q_b_mvar (float)

  • q_c_mvar (float)

  • sn_mva (float)

  • name (str | None)

  • scaling (float)

  • index (int | integer | None)

  • in_service (bool)

  • type (Literal['wye', 'delta'])

Returns:

index (int) - The unique ID of the created element

Return type:

int | integer

Example

create_asymmetric_load(net, bus=0, p_c_mw=9., q_c_mvar=1.8)

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 pandapower. 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]