A 12-pulse current source converter based on autotransformer

摘要

According to the principle of DC injection, the topology of a 12-pulse current source converter based on autotransformer is proposed. The Main bridge topology is a autotransformer, and each injection branch consists of a double winding reactor and a IGBT and a diode in series. DC injection could make the main bridge realize zero current switching and operate in four quadrants. The system control method is presented on 9-level topology. The simulation based on MATLAB shows that the topology has good characteristic. Compared with traditional current source converter, the novel topology solves the problem of high THD in traditional 12-pulse converter, and reduces the system volume and capacity efficiently. Moreover it applies to the high-power field.