Analysis and Matlab Simulation of 30-Pulse Rectification System Based on Stretch Triangle Transformer

Three-phase high-power rectifier has widely applied to electromotor and high-power AC-DC transformation, but there are many problems such as many harmonic waves and low power factor about high-power rectifier. Along with much request of green electrical source, it is more and more important to reduce its disturbance to electrical network. High-frequency PWM rectifier can adjust output voltage and make input current near to sine wave efficiently, but there are disadvantages such as high cost, high switch cost and low efficiency especial in high-power field. At high-power rectifier field, multi-pulse rectifier is used more widely. In the first place, this paper introduces the realization of phase-shifting of the multi-pulse converter transformer and the method for calculating stretch triangle voltage, phase-shifting angle and the number of windings. In the second place, this paper analyses and simulates the 30-pluse rectification system based on this transformer. At last, the experiment results verify its feasibility.