A Novel Algorithm of SVPWM and the Study on the Essential Relationship Between SVPWM and SPWM
Daming Liu · Proceedings of the CSEE · 2006
The algorithm of conventional space vector PWM needs complex co-ordinate transformations, trigonometric function and inverse trigonometric function calculations, and this leads more calculation operations and low calculation precision. A Novel algorithm of space vector PWM for three-phase voltage fed inverter is proposed, it hasn’t any co-ordinate transformations, trigonometric function and inverse trigonometric function calculation, and has only normal arithmetic operations. The whole algorithm becomes very simple and the calculation results become more accurate. The relationships between SVPWM, SPWM and the algebraic solution of PWM converter’s control equation are discussed in detail, and the essence of SVPWM is pointed out to be an optimum solution of PWM converter’s control equation, the result of SPWM is equal to the special solution of PWM converter’s control equation assuming that there exists a fictional-ground-wire. And the essential relationship between SVPWM and SPWM is that they all are the special solutions of PWM converter’s control equation under different supplementary conditions. The experiment results of three-phase three-wire DC/AC PWM converter under the proposed algorithm are given and the control performance is analyzed. The experiment results show the validity and feasibility.