A Novel Three-Phase to Single-Phase Matrix Converter-Based Transient Electromagnetic Transmitter

摘要

A novel transmitter for transient electromagnetic method (TEM) instrument is proposed in this paper, which is based on three-phase to single-phase matrix converter (TSMC), instead of a conventional transmitter which is composed of an AC-DC converter and an H-bridge inverter. The equivalent circuit model of TSMC-based transmitter is built, and the principle is discussed. In order to make output current satisfy the requirement of TEM, which is a bipolar square wave with 50% duty cycle, the hysteresis control strategy with voltage vector is proposed. The switching process of TSMC is present. The simulations of different output frequency and current are completed. A small power prototype is built, and the experiment of 25 Hz output current is implemented. The simulation and experimental results validate the performance of the proposed transmitter and control method.