current fed high-frequency ac distributed power system for medium–high-voltage gate driving...

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Current-Fed High-Frequency AC Distributed Power System for

Medium–High-Voltage Gate Driving Applications

Abstract

A current-fed high-frequency alternating-current (HFAC) distributed

power system is presented in this paper for medium- or high-voltage gate

driving applications. The distributed gate driving modules (GDMs) at the

high-voltage side are isolated from the low-voltage-side current-source

power supply through magnetic coupling of current transformers (CTs),

which are assembled by a high-voltage cable carrying HFAC and passing

through the center of toroid magnetic cores. The centralized high-

frequency current-source power supply is designed and composed of a

two-stage resonant inverter and a double Γ-CL resonant network. The

resonant network is parameterized by considering the tradeoff between

the quality factor and component stress. Different magnetic core samples

are tested and compared to construct the CTs for improving transmission

efficiency. A 400-W prototype was built and experimentally evaluated with

two load conditions, including resistive loads and practical GDMs. It

showed significant improvements with regard to sinusoidal current output,

system stability, and efficiency. Finally, the proposed current-fed HFAC

power supply system was successfully applied to a practical solid-state

fault current limiter, demonstrating the advantages of multiple outputs (n

> 10), high-voltage isolation, low harmonic distortion, high efficiency,

easy installation, and flexible extensibility.