access icon free Series-connected 36-pulse rectifier using a hybrid harmonic injection method

© The Institution of Engineering and Technology
Received 09/05/2020, Accepted 30/11/2020, Revised 03/11/2020, Published 17/12/2020

This study proposes a hybrid voltage harmonic injection circuit at the DC link of the traditional series-connected 12-pulse rectifier to improve the harmonic suppression performance of the rectifier, which contains an injection transformer and the auxiliary circuit. The optimum turn ratio of the injection transformer and the optimal conduction angle of the switch are designed from the viewpoint of minimising the total harmonic distortion (THD) of the input voltage in the isolated transformer. Under the optimal design, the proposed series-connected rectifier operates as a 36-pulse rectifier. Experimental results indicate that the THD of input voltage reduces to ∼3.19% and that of the input current is only ∼2%.

Inspec keywords: harmonics suppression; harmonic distortion; rectifying circuits; AC-DC power convertors; power transformers; rectifiers; invertors; transformer windings

Other keywords: total harmonic distortion; optimum turn ratio; input voltage; isolated transformer; DC link; auxiliary circuit; injection transformer; traditional series-connected 12-pulse rectifier; harmonic suppression performance; hybrid harmonic injection method; series-connected rectifier; series-connected 36-pulse rectifier; optimal conduction angle; hybrid voltage harmonic injection circuit; optimal design

Subjects: AC-DC power convertors (rectifiers); Control of electric power systems; Transformers and reactors; Power convertors and power supplies to apparatus

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