Motor

Create Function

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 \(Q_{motor}\).