Abstract
This article analyzes the structure of an 84-pulse voltage source converter, assembled by one 12-pulse voltage source converter in conjunction with an asymmetric single-phase seven-level converter with the addition of an injection transformer. Through the application of this novel structure, the total harmonic distortion in the voltage source converter's output is reduced, allowing its use in special applications or as the basement for FACTS devices. The proposition allows savings on the total amount of switches employed and a few capacitors to ward off unbalance problems. Emphasis is given on the automatic control of the reactive power exchange, providing a detailed and explicit explanation of the used blocks. A synchronizing strategy to match phase and frequency in an automatic way is also included. Simulations and experimental results are given to show the proposal appropriateness.
Published Version
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