Design of D-Type Asymmetric 24-Pulse Auto-Transformer Rectifier
Li Nan1, Ge Hongjuan1, 2, Zhang Lu2, Lin Yi2
1. School of Automation Nanjing University of Aeronautics & Astronautics Nanjing 211106 China;; 2. School of Civil Aviation Nanjing University of Aeronautics & Astronautics Nanjing 211106 China;
Abstract：The existing 24-pulse autotransformer rectifier needs a large number of balanced reactors to ensure that the four sets of rectifier bridges work at the same time, which is complex. To solve this problem, a D-type asymmetric 24-pulse autotransformer rectifier structure is presented. There are no balance reactors at the output side and only 4 windings per phase in the transformer. The structure is simple and the system complexity is low. With proper designation of the primary and secondary side turns, the structure can output four groups of three-phase voltage with different amplitudes. These four sets of three-phase voltages make up 24 phase voltage vectors with the same amplitude and phase-difference of 15°, then across four rectifier bridges and convert into 24-pluse DC voltage. The relationship between primary and secondary turns, the winding current, and the equivalent capacity of autotransformer were analyzed. Eight ways of transformer winding connection and their performance parameters were presented, by changing the same name side, the position of the secondary winding of the autotransformer and the middle tap position of the primary winding. The superiority of this structure was validated. Finally, the feasibility of the design was verified by simulations and experiments
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2019, Vol. 34 
