Bus

Create Function

Input Parameters

net.bus

Parameter	Datatype	Value Range	Explanation
name	string		name of the bus
vn_kv*	float	\(>\) 0	rated voltage of the bus [kV]
type	string	naming conventions: “n” - node “b” - busbar “m” - muff	type variable to classify buses
zone	string		can be used to group buses, for example network groups / regions
max_vm_pu**	float	\(>\) 0	Maximum voltage
min_vm_pu**	float	\(>\) 0	Minimum voltage
in_service*	boolean	True / False	specifies if the bus is in service.
geo	string / object		geojson.Point as object or string

*necessary for executing a power flow calculation
**optimal power flow parameter

Note

Bus voltage limits can not be set for slack buses and will be ignored by the optimal power flow.

Electric Model

Result Parameters

net.res_bus

Parameter	Datatype	Explanation
vm_pu	float	voltage magnitude [p.u]
va_degree	float	voltage angle [degree]
p_mw	float	resulting active power demand [MW]
q_mvar	float	resulting reactive power demand [Mvar]

The power flow bus results are defined as:

\begin{align*} vm\_pu &= \lvert \underline{V}_{bus} \rvert \\ va\_degree &= \angle \underline{V}_{bus} \\ p\_mw &= Re(\sum_{n=1}^N \underline{S}_{bus, n}) \\ q\_mvar &= Im(\sum_{n=1}^N \underline{S}_{bus, n}) \end{align*}

net.res_bus_3ph

Parameter	Datatype	Explanation
vm_a_pu	float	voltage magnitude:Phase A [p.u]
va_a_degree	float	voltage angle:Phase A [degree]
vm_b_pu	float	voltage magnitude:Phase B [p.u]
va_b_degree	float	voltage angle:Phase B [degree]
vm_c_pu	float	voltage magnitude:Phase C [p.u]
va_c_degree	float	voltage angle:Phase C [degree]
p_a_mw	float	resulting active power demand:Phase A [MW]
q_a_mvar	float	resulting reactive power demand:Phase A [Mvar]
p_b_mw	float	resulting active power demand:Phase B [MW]
q_b_mvar	float	resulting reactive power demand:Phase B [Mvar]
p_c_mw	float	resulting active power demand:Phase C [MW]
q_c_mvar	float	resulting reactive power demand:Phase C [Mvar]
unbalance_percent	float	unbalance in percent defined as the ratio of V2 and V1 according to IEC 62749

The power flow bus results are defined as:

\begin{align*} vm\_pu_{phase} &= \lvert \underline{V_{phase}}_{bus} \rvert \\ va\_degree_{phase} &= \angle \underline{V_{phase}}_{bus} \\ p\_mw_{phase} &= Re(\sum_{n=1}^N \underline{S_{phase}}_{bus, n}) \\ q\_mvar_{phase} &= Im(\sum_{n=1}^N \underline{S_{phase}}_{bus, n}) \end{align*}

net.res_bus_est

The state estimation results are put into net.res_bus_est with the same definition as in net.res_bus.

Parameter	Datatype	Explanation
vm_pu	float	voltage magnitude [p.u]
va_degree	float	voltage angle [degree]
p_mw	float	resulting active power demand [MW]
q_mvar	float	resulting reactive power demand [Mvar]

Note

Bus power values are given in the consumer system. Therefore a bus with positive p_mw value consumes power while a bus with negative active power supplies power.

net.res_bus_sc

The short-circuit (SC) results are put into net.res_bus_sc with following definitions:

Parameter	Datatype	Explanation
ikss_ka	float	initial short-circuit current value [kA]
skss_mw	float	initial short-circuit power [MW]
ip_ka	float	peak value of the short-circuit current [kA]
ith_ka	float	equivalent thermal short-circuit current [kA]
rk_ohm	float	resistive part of equiv. (positive/negative sequence) SC impedance [Ohm]
xk_ohm	float	reactive part of equiv. (positive/negative sequence) SC impedance [Ohm]
rk0_ohm	float	resistive part of equiv. (zero sequence) SC impedance [Ohm]
xk0_ohm	float	reactive part of equiv. (zero sequence) SC impedance [Ohm]