Voltage Reinjection: Optimizing the Cost and Size of the Interface Transformer in 12-pulse Converters

So far, to improve the harmonic situation of voltage source converters and reduce the output voltage THD, several approaches have been proposed which are effective in different applications. One of them is the voltage reinjection strategy in 12-pulse converters. In this paper, the fundamental of voltage reinjection strategy is introduced and an attractive configuration is analyzed. Based on these studies, the main reason of the cost and magnitude of the voltage reinjection configurations is the large size of the interface transformer. So, in this paper, a novel and effective configuration is proposed to reduce the size and cost of interface transformers in 12- pulse converters. But, before that, several different configurations of interface transformers are analyzed which are used in the constructed cases. The comparison among the existing configurations and proposed interface transformer shows that this structure is smaller, cheaper and less complex than other configurations. The simulation results in MATLAB/SIMULINK approve the performance and accuracy of the proposed configuration.