An optimum PWM technique to maximize the continuity of inverter output

摘要

New varied-pulse-width technique (VPW) for a high performance power inverter has been presented in this paper. The VPW technique improves the inverter output voltage in the way to produce an output cycle of a less discontinuity and fewer harmonic contents. In VPW technique, the original pulse-width of an inverter operation is divided into multiple pulses of variable widths per half cycle. The division of an original single-pulse of width (δ) into number of pulses (p) per half cycle produces uniform pulses of width (σ). Increasing the pulse-width for some pulses and decreasing the same amount of width from other pulses, result in variable-width pulses. To maintain the same operation for the inverter, the adding and subtracting of pulse-widths for the pulses must be equivalent. Due to the software ability of modifying the number of pulses per half cycle and their widths, the VPW technique provides an inverter operation with less generation of harmonics. Test results are presented to examine the performance of VPW technique and to compare it with the performance of the conventional methods.