A Novel 36-Pulse Star Rectifier with Passive Injection Circuits at DC Link

This paper presents a new 36-pulse star connected rectifier. It takes intimate sinusoidal currents from utility with the elimination of lower than 35
^th
order harmonics. The proposed rectifier consists of a parallel four-star 12-pulse diode rectifier and two passive injection circuits at DC links. This passive injection circuit can triple the number of pulses of 12-pulse star rectifier system. The primary side of specially tapped interphase transformer (STIT) with two diodes constitutes the first injection circuit while the secondary winding of the STIT with a single phase full-wave rectifier (SPFR) constitutes the second passive injection circuit. This rectifier is compatible for large current rating application such as electroplating, plasma torches, dc arc furnaces etc. The simplicity of the proposed rectifier scheme makes it more economical compared to other existing designs of same performance. The proposed rectifier is examined and simulated in MATLAB environment. The simulation result confirms the requirement of IEEE-519 standards.