Load Adaptability of Active Harmonic Reduction for 12-Pulse Diode Bridge Rectifier With Active Interphase Reactor

In order to improve the harmonic reduction ability of 12-pulse rectifier, an active interphase reactor (AIPR) and corresponding auxiliary circuit are often used to produce circulating current resulting in harmonic reduction. This paper analyzes the load adaptability of 12-pulse rectifier with AIPR. The loads are classified into three types, RL-type load, RC-type load, and RLC-type load. Load currents and circulating currents are calculated under different load types. According to the calculation results, the THD of input line current and ripple coefficient of load voltage are also described by figures under RL-type load and RLC-type load. The appropriate amplitude of the circulating current under RL -type load and the LC filter under RLC-type load are presented. Simulation and experimental results validate the theoretical analysis.