220.127.116.11 Model Transformation using Decoupling Matrix
Since the system under discussion is a seven-phase one, the complete model can only be elaborated in seven-dimensional space. The first two-dimensional spaces are d-q, the second one is x1-y1, the third one is x2-y2, and the last is zero-sequence component that is absent due to the assumption of isolated neutral. On the basis of the general decoupling transformation matrix for an n-phase system, inverter voltage space vectors in the second two-dimensional subspace (x1-y1) and third two-dimensional subspace (x2-y2) are determined as
Thus, 128 space vectors of phase-to-neutral voltage ...