Development and Experimental Testing of a Single-Phase B-Spline-Based SPWM Inverter

This paper presents real-time implementation and testing of a new family of cardinal beta-spline carrier signals. These carrier signals are tested for a single phase (1Phi) sinusoidal pulse-width modulated (SPWM) voltage-source (VS) inverter. The conventional SPWM technique uses triangular carrier signals, which can be interpreted as a periodic form of the second order cardinal beta-spline function. The proposed family of carrier signals are periodic cardinal beta-spline functions of order higher than 2. An algorithm to implement different orders of periodic cardinal beta-spline functions is developed and implemented for experimental testing on a 1Phi VS 4-pulse IGBT SPWM inverter. The developed algorithm and the generation of SPWM switching pulses are executed by a dSPACE ds1102 digital signal processor (DSP) board. Test results demonstrate a significant performance improvement using proposed carrier signals, where output harmonic contents are reduced and the magnitude of the fundamental component is improved