An optimized algorithm for SVPWM based on three-phase stationary frame

The conventional space vector pulse width modulation (SVPWM), including coordinate transformation, sector identification, and active time calculations of voltage vectors, needs lots of complex irrational number operations such as trigonometric function calculations, which introduces challenges for real-time digital control chips. Considering the shortcomings of traditional algorithm, this paper presents an optimized algorithm based on three-phase stationary frame. In the proposed algorithm, the reference voltage vector is projected onto the three-phase stationary frame firstly, then a unified formula is obtained by utilizing the principle of symmetric, where only normal mathematical operations of modulation wave is required. With the unified formula, the duty ratios of three bridge-arms will be calculated directly. Comparing with conventional algorithm, the proposed algorithm is more suitable for digital system owing to the characteristic of easier programming, faster operating speed, and higher real-time ability. The simulation and experimental results show the validity and feasibility of the proposed algorithm.