Harmonics mitigation approach by using pulse‐doubling circuit in the AC–DC rectifier

In this research, a novel pulse‐doubling circuit (PDC) is employed to upgrade the 28‐pulse rectifier to the efficient 56‐pulse rectifier. The main objective of this research is to reduce the power kVA rating. In the autotransformer with a 14‐phase polygon structure, the kVA rating is approximately 39.5% of the load power. Since the pulse‐doubling method is utilized, the rectifier with 56 pulses has benefited from a simpler structure. With a comparison to the other rectifiers, the harmonic mitigation is the clearest feature of the proposed rectifier. According to the experimental and theoretical results, in the proposed rectifier with 56 pulses, the input current THD is less than 3%. Finally, the volume and cost of the proposed rectifier with 56 pulses show a notable reduction. In other words, the proposed rectifier is an economical choice for most sectors of the industry. In this research, a novel pulse‐doubling circuit (PDC) is employed to upgrade the 28‐pulse rectifier to the efficient 56‐pulse rectifier. In the autotransformer with 14‐phase polygon structure, the kVA rating is approximately 39.5% of the load power. According to the experimental and theoretical results, in the proposed rectifier with 56 pulses, the input current THD is less than 3%.

Total harmonic distortion (THD)