A new 3D-SVPWM algorithm for four-leg inverters

A new algorithm of tetrahedron determination applied to the SVPWM control of four leg inverters is presented in this work. Indeed during the last years two main families of works were existing under this subject, the first one used the alphabetagamma frame , while, the second one used the abc frame. In this algorithm, it is proposed a new method for the determination of the reference vector location in the space of a three phase system, even though; it presents unbalance, harmonics or both of them. The calculation of the duty times is done simply using the values of 0 or 1 representing the status of the switching patterns. The use of this algorithm with the active filtering gives good operation performances, chiefly when the algorithm used for the calculation of the voltages or currents references is based on the alphabetagamma frame. This algorithm can minimize extremely the time and the complexity of calculation since the proposed new process is simpler and faster and can be implemented easily.