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

pandapower.create.create_asymmetric_load(net, bus, p_a_mw=_asymmetric_load_p_a_mw, p_b_mw=_asymmetric_load_p_b_mw, p_c_mw=_asymmetric_load_p_c_mw, q_a_mvar=_asymmetric_load_q_a_mvar, q_b_mvar=_asymmetric_load_q_b_mvar, q_c_mvar=_asymmetric_load_q_c_mvar, sn_a_mva=nan, sn_b_mva=nan, sn_c_mva=nan, sn_mva=nan, name=None, scaling=_asymmetric_load_scaling, index=None, in_service=_asymmetric_load_in_service, type=_asymmetric_load_type, **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:

net (pandapowerNet) – The net within this load should be created
bus (int | integer) – The bus id to which the load is connected
p_a_mw (float) – The active power for Phase A load
p_b_mw (float) – The active power for Phase B load
p_c_mw (float) – The active power for Phase C load
q_a_mvar (float) – The reactive power for Phase A load
q_b_mvar (float) – The reactive power for Phase B load
q_c_mvar (float) – The reactive power for Phase C load
sn_a_mva (float) – Nominal power for Phase A load
sn_b_mva (float) – Nominal power for Phase B load
sn_c_mva (float) – Nominal power for Phase C load
sn_mva (float) – Nominal power of the load
name (str | None) – The name for this load
scaling (float) – An OPTIONAL custom scaling factor. Multiplies with p_mw and q_mvar of all phases.
type (Literal['wye', 'delta']) – type variable to classify three ph load: delta/wye
index (int | integer | 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 (bool) – True for in_service or False for out of service

Returns:

The ID of the created asymmetric load

Return type:

int | integer

Example

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

Table Structure

net.asymmetric_load

Parameter	Datatype	Value Range	Explanation	nullable	required
name			name of the load	✓
bus	int	>=0	index of connected bus		✓
p_a_mw	float	>=0	Phase A active power of the load [MW]		✓
p_b_mw	float	>=0	Phase B active power of the load [MW]		✓
p_c_mw	float	>=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]	✓
sn_a_mva	float	>0	Phase A rated power of the load [MVA]	✓
sn_b_mva	float	>0	Phase B rated power of the load [MVA]	✓
sn_c_mva	float	>0	Phase C rated power of the load [MVA]	✓
scaling	float	>=0	scaling factor for active and reactive power		✓
in_service	bool		specifies if the load is in service.		✓
type	string		type of load		✓

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

Delta Load

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

Result Table

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]