Harmonic tensor linearisation of HVDC converters

The equivalent harrhonic impedances associated with time-variant devices such as FACTs and HVdc 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 converter on the ac side.