Research Of Four-legged Three-phase Inverter Based On DSP

What we discussed is four-legged three-phase inverter. The topology can realize three-phase four-line AC output, and make the size and weight of inverter small. This inverter adopts a novel three-dimensional Space Vector Modulation (3D-SVM). The control mode must process large numbers of mathematics operation. So it must be realized by the Digital Signal Processor.This paper discussed the principle of 3D-SVM and four-legged three-phase inverter detailedly. We deduced the expression of Space Vector, analysed the figure of Space Vector contrail under random load, and compile the C program to realize the SVM.We have executed the simulation and analysis base on the 15KVA power inverter and programmed on the digital control platform and processed the experiment. From the figures of simulation and the result of experiment, the four-legged three-phase inverter with 3D-SVM can output the excellent three-phase AC voltage under the random load.