Harmonic tensor linearisation of HVDC converters

The equivalent harmonic impedances associated with time-variant devices such as FACTS and HVDC power converters are in many cases phase-dependent. The second rank tensor is proposed as a means of performing the nodal analysis of networks incorporating phase-dependent admittances. A useful geometric interpretation of phase dependency is developed and applied to the calculation of the harmonic phase-dependent impedance of a HVDC power converter on the AC side.