Asymmetric Static Generator¶
Note
Static generators should always have a positive p_mw value, since all power values are given in the generator convention. If you want to model constant power consumption, it is recommended to use a load element instead of a static generator with negative active power value. If you want to model a voltage controlled generator, use the generator element.
See also
Create Function¶

pandapower.
create_asymmetric_sgen
(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, index=None, scaling=1.0, type='wye', in_service=True, k=nan, rx=nan)¶ Adds one static generator in table net[“asymmetric_sgen”].
Static generators are modelled as negative PQ loads. This element is used to model generators with a constant active and reactive power feedin. If you want to model a voltage controlled generator, use the generator element instead.
All elements in the grid are modelled in the consumer system, including generators! If you want to model the generation of power, you have to assign a negative active power to the generator. Please pay attention to the correct signing of the reactive power as well.
 INPUT:
net  The net within this static generator should be created
bus (int)  The bus id to which the static generator is connected
p_a_mw (float)  The real power of the static generator : Phase A (negative for generation!)
p_b_mw (float)  The real power of the static generator : Phase B(negative for generation!)
p_c_mw (float)  The real power of the static generator : Phase C (negative for generation!)
OPTIONAL:
q_a_mvar (float, default 0)  The reactive power of the sgen : Phase A
q_b_mvar (float, default 0)  The reactive power of the sgen : Phase B
q_c_mvar (float, default 0)  The reactive power of the sgen : Phase C
sn_kva (float, default None)  Nominal power of the sgen
name (string, default None)  The name for this sgen
index (int, None)  Force a specified ID if it is available. If None, the index one higher than the highest already existing index is selected.
scaling (float, 1.)  An OPTIONAL scaling factor to be set customly
type (string, ‘wye’)  Three phase Connection type of the static generator: wye/delta
in_service (boolean)  True for in_service or False for out of service
k (float, NaN)  Ratio of nominal current to short circuit current
rx (float, NaN)  R/X ratio for short circuit impedance. Only relevant if type is specified as motor so that sgen is treated as asynchronous motor
 OUTPUT:
index (int)  The unique ID of the created sgen
 EXAMPLE:
create_asymmetric_sgen(net, 1, p_b_mw = 120)
Input Parameters¶
net.asymmetric_sgen
Parameter 
Datatype 
Value Range 
Explanation 
name 
string 
name of the static generator 

type 
string 
naming conventions:
“PV”  photovoltaic system
“WP”  wind power system
“CHP”  combined heating and power system

type of generator 
bus* 
integer 
index of connected bus 

p_a_mw* 
float 
\(\leq\) 0 
active power of the static generator : Phase A[MW] 
q_a_mvar* 
float 
reactive power of the static generator : Phase A [MVar] 

p_b_mw* 
float 
\(\leq\) 0 
active power of the static generator : Phase B[MW] 
q_b_mvar* 
float 
reactive power of the static generator : Phase B [MVar] 

p_c_mw* 
float 
\(\leq\) 0 
active power of the static generator : Phase C[MW] 
q_c_mvar* 
float 
reactive power of the static generator : Phase C [MVar] 

sn_mva 
float 
\(>\) 0 
rated power ot the static generator [MVA] 
scaling* 
float 
\(\geq\) 0 
scaling factor for the active and reactive power 
max_p_mw** 
float 
Maximum active power [MW] 

min_p_mw** 
float 
Minimum active power [MW] 

max_q_mvar** 
float 
Maximum reactive power [MVar] 

min_q_mvar** 
float 
Minimum reactive power [MVar] 

controllable** 
bool 
States if sgen is controllable or not, sgen will not be used as a flexibilty if it is not controllable 

k*** 
float 
\(\geq\) 0 
Ratio of nominal current to short circuit current 
rx*** 
float 
\(\geq\) 0 
R/X ratio for short circuit impedance. Only relevant if type is specified as motor so that sgen is treated as asynchronous motor 
in_service* 
boolean 
True / False 
specifies if the generator is in service. 
*necessary for executing a power flow calculation
**optimal power flow parameter
Electric Model¶
Static Generators are modelled as PQbuses in the power flow calculation:
The PQValues are calculated from the parameter table values as:
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!
Result Parameters¶
net.asymmetric_sgen
Parameter 
Datatype 
Explanation 
p_a_mw 
float 
resulting active power demand after scaling : Phase A [MW] 
q_a_mvar 
float 
resulting reactive power demand after scaling : Phase A [MVar] 
p_b_mw 
float 
resulting active power demand after scaling : Phase B [MW] 
q_b_mvar 
float 
resulting reactive power demand after scaling : Phase B [MVar] 
p_c_mw 
float 
resulting active power demand after scaling : Phase C [MW] 
q_c_mvar 
float 
resulting reactive power demand after scaling : Phase C [MVar] 
The power values in the net.res_sgen table are equivalent to \(P_{sgen}\) and \(Q_{sgen}\).