## Example 3 - Unbalanced Voltage Source

In order to model an unbalanced voltage source, three independent single-phase voltage sources are required. Those must be connected appropriately to represent the desired connection configuration. Since the voltage sources are independent, the source impedance must be modeled with a separate element to preserve the mutual coupling between phases. In the example below, a reactor is used for that purpose. Note that, in this case, if the desired configuration is Wye, the basekV parameter must be specified as a line-to-neutral voltage.

Figure 9: 3-Phase Wye Grounded-Connected Unbalanced Vsource Element

New Circuit.ThA bus1=A_internal.1 phases=1 pu=1.1 basekv=7.97

~ Z0=[1e-6,1e-6] Z1=[1e-6,1e-6]

New Vsource.ThB bus1=A_internal.2 phases=1 pu=1.1 basekv=7.97

~ Z0=[1e-6,1e-6] Z1=[1e-6,1e-6]

New Vsource.ThC bus1=A_internal.3 phases=1 pu=1.1 basekv=7.97

~ Z0=[1e-6,1e-6] Z1=[1e-6,1e-6]

New Reactor.SourceImpedance bus1=A_internal.1.2.3 bus2=A.1.2.3

~ Z0=[0.025862916,0.077588748] Z1=[0.023094242,0.092376969]

Set voltagebases=[13.8]

Calcvoltagebases

Solve