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Integration of the Measurement Vector Insertion Method (MVIM) with Discontinuous PWM for Enhanced Single Current Sensor Operation

The previously-introduced measurement vector insertion method (MVIM) is a promising technique for providing three-phase current measurements using a single dc-link current sensor. If MVIM is combined with discontinuous PWM (DPWM), the number of added switching events can be significantly reduced. Additional advantages include a reduction of the unmeasurable regions by as much as 50%, and improved modulator linearity in the overmodulation region. A hybrid strategy that uses DWPM in the high-modulation-index region and conventional continuous SVPWM for all lower values of modulation index is proposed in order to maximize the advantages of the DPWM algorithm while minimizing its limitations. A combination of analysis, simulation, and experimental tests is used to demonstrate the attractive performance characteristics of the proposed MVIM enhancement technique