Control of bidirectional power conversion

The author discusses the analysis and the improvement of tolerance band control of pulsewidth modulated voltage source three phase inverters providing nearly sinusoidal AC line currents. The principal contribution is the detailed numerical analysis and the articulation of the major drawbacks of the so called regular switching pattern (RSP) used most often by simulation results as well as the introduction of a new adaptive switching pattern (ASP) to suppress one undesirable property. It is done by developing the locus of the initial direction vector of the current error in the synchronous reference frame. The results of computer simulation verify the theoretical considerations.