Comparison of vector sigma-delta modulation and space-vector PWM

The paper introduces certain modifications to the basic idea of vector sigma-delta modulation (VSDM), aimed to eliminate the polarity reversals in the line-line voltages, and to reduce the inverter switching losses. The performance of this modified VSDM is then compared with the space-vector PWM (SVPWM). The comparison indicates that the VSDM enjoys performance figures that are close to-and in some regions even better than-the commonly accepted SVPWM algorithm. A very valuable property of VSDM, not shared by the SVPWM, is that it can be smoothly tuned to the designer´s priorities and varying operating conditions by simple parametric adjustments, without any modifications of the timing structure. Other assets include the freedom from minimum pulse width problems relaxed hardware requirements and reduced dead-time distortion in the lower voltage range. Thus, the VSDM can prove very useful as a complementary idea for the control of voltage-source inverters