Research Of 3D-Space Vector Modulation Controlled Four-Legged Three Phase Inverter Based On DSP

Electronic Inverter is widely used in Variable Speed Constant Frequency (VSCF) Electrical System, UPS, and other kinds of power supplies. With the continuous development of PWM control strategy and Digital Signal Processing technology, the method of the PWM control incline to digital control and then the PWM technique plays more and more important role on the DC-AC inverter control. The system based on DSP can realize flexible and precise real-time control by software. It has the virtues of modularization, integration, high reliability, easily replanting, and so on. We discussed the three-phase four-legged inverter with a novel three-dimensional Space Vector Modulation (3D-SVM) in this paper. In order to obtain three-phase four-line AC output, system applied the four-legged main circuit topology. With the 3D-SVM, the power system realizes voltage regulation and three-phase four-line output . Meanwhile, this kind of control is easy to be realized in the digital inverter.We discussed the principle of 3D-SVM and four legged circuit topology detailedly, attained the related control scheme. With the example of 15kVA Power System's inverter, the principle and derivation of 3D-SVM, as well as the verification of simulation result was carried out. At last, we programmed on the digital congtrol platform and processed the light load experiment.