Generalized Algorithm for Pulse Width Modulation using a Two-Vectors Based Technique

This paper presents a generalized and compact space vector modulation algorithm valid for both (a, b, c) and (x, y) coordinates, suitable for triangle comparison modulators. The proposed algorithm uses a two base-vectors duty cycle computation by mapping the solution space into only three parallelogram shaped zones (Fig. A). This generalized algorithm is especially suited for vector control applications requiring high dynamic response and for applications where changes in demand may happen at a frequency comparable with the modulator's carrier frequency. Several carrier base modulation methods extensively described in the literature are obtained from the proposed generalized space vector modulation algorithm with the introduction of the null vector ratio δ. The proposed method has been experimentally tested, and a practical implementation of the generalized algorithm with low computational requirements is presented.