Unified space vector PWM implementation method for three-phase inverters

The relationship between space vector pulse width modulation (SVPWM) and carrier-based PWM methods is comprehensively analyzed. The explicit modulation function expression, in which various continuous and discontinuous SVPWM strategies are intuitively embodied, is established, and a unified carrier-based SVPWM method is presented. Furthermore, a unified SVPWM fast algorithm for three-phase inverters is proposed. The proposed algorithm calculates the actual gating times for each inverter leg directly by use of three-phase reference voltages and needn't complex coordinate transformations, trigonometric function calculations, sector number identification, and the recombination of actual gating times, so it can be more easily implemented with a microprocessor compared with SVPWM conventional algorithm. At last, the output voltage harmonic characteristics of the three-phase inverter under the SPWM and various SVPWM control are investigated. The simulation and experimental results show that the unified SVPWM implementation method for three-phase inverters is feasible and valid.