In this paper, a novel analysis of a carrier based PWM method for multilevel inverters is presented. The space vector PWM and carrier based PWM correlations in multilevel inverters are investigated in a nominal two-level switching diagram. The obtained results can be applied to design various carrier PWM techniques. In this paper, a carrier based single-state PWM technique, which reduces the switching number and optimizes the active voltage errors, is presented. This PWM technique can be advantageous if there are a large number of levels. The proposed method is mathematically formulated and demonstrated by simulations and experimental results.
Recently, for multilevel inverters, the various PWM performances can be properly controlled by an offset controller in the carrier based PWM modulator. It has shown a generalised algorithm for realizing a discontinuous PWM technique for defined common mode. For applications with variable load power factor, reduction of switching losses can be improved if common mode is properly adjusted to avoid commutation instants at high current amplitudes. In the paper, the problem, how to design a common mode in DPWM for variable load power factor will be investigated. A novel carrier PWM algorithm capable of offset control will be presented. The advantage is simple and flexible algorithm. This algorithm will be utilized in designing an optimized discontinuous PWM for variable load power factor. The method is mathematically formulated and demonstrated by simulation results.
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