Motor

Create Function

pandapower.create.create_motor(net, bus, pn_mech_mw, cos_phi, efficiency_percent=100.0, loading_percent=100.0, name=None, lrc_pu=nan, scaling=1.0, vn_kv=nan, rx=nan, index=None, in_service=True, cos_phi_n=nan, efficiency_n_percent=nan, **kwargs)

Adds a motor to the network.

INPUT:

net - The net within this motor should be created

bus (int) - The bus id to which the motor is connected

pn_mech_mw (float) - Mechanical rated power of the motor

cos_phi (float, nan) - cosine phi at current operating point

OPTIONAL:

name (string, None) - The name for this motor

efficiency_percent (float, 100) - Efficiency in percent at current operating point

loading_percent (float, 100) - The mechanical loading in percentage of the rated mechanical power

scaling (float, 1.0) - scaling factor which for the active power of the motor

cos_phi_n (float, nan) - cosine phi at rated power of the motor for short-circuit calculation

efficiency_n_percent (float, 100) - Efficiency in percent at rated power for short-circuit calculation

lrc_pu (float, nan) - locked rotor current in relation to the rated motor current

rx (float, nan) - R/X ratio of the motor for short-circuit calculation.

vn_kv (float, NaN) - Rated voltage of the motor for short-circuit calculation

in_service (bool, True) - True for in_service or False for out of service

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.

OUTPUT:

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

EXAMPLE:

create_motor(net, 1, pn_mech_mw = 0.120, cos_ph=0.9, vn_kv=0.6, efficiency_percent=90, loading_percent=40, lrc_pu=6.0)

Input Parameters

net.motor

Parameter	Datatype	Value Range	Explanation
name	string		name of the motor
bus *	integer		index of connected bus
pn_mech_mw*	float	\(\geq 0\)	Mechanical rated power of the motor [MW]
cos_phi *	float	\(0...1\)	cosine phi at current operating point
cos_phi_n *	float	\(0...1\)	cosine phi at rated power of the motor for short-circuit calculation
efficiency_percent *	float	\(0..100\)	Efficiency in percent at current operating point[%]
efficiency_n_percent *	float	\(0..100\)	Efficiency in percent at rated power for short-circuit calculation [%]
loading_percent *	float	\(0..100\)	Efficiency in percent at rated power for short-circuit calculation [%] [%]
scaling *	float	\(\geq 0\)	scaling factor for active and reactive power
lrc_pu *	float	\(\geq 0\)	locked rotor current in relation to the rated motor current [pu]
rx *	float	\(\geq 0\)	R/X ratio of the motor for short-circuit calculation.
vn_kv *	float	\(\geq 0\)	Rated voltage of the motor for short-circuit calculation
in_service*	boolean	True / False	specifies if the motor is in service.

*necessary for executing a power flow calculation.

Electric Model

\begin{align*} P_{motor, n} =& pn\_mech\_mw / (efficiency\_percent/100) \\ P_{motor} =& P_{motor, n} * (loading\_percent / 100) * scaling \\ S_{motor} =& P_{motor} / cos\_phi \\ Q_{motor} =& \sqrt{S_{motor}^2 - P_{motor}^2} \end{align*}

Result Parameters

net.res_motor

Parameter	Datatype	Explanation
p_mw	float	resulting active power demand [MW]
q_mvar	float	resulting reactive power demand [MVar]

The power values in the net.res_motor table are equivalent to \(P_{motor}\) and \(Q_{motor}\).