带高频开三角变压器和闭环输出稳压的直接三相交直流整流器

Erick I. Pool-Mazun, Kevin Kim, P. Enjeti
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引用次数: 0

摘要

本文提出了一种高频变压器隔离配置为开三角的大电流直接三相交直流整流器。三相输入电压由两个交流到交流转换器调制以产生20khz的高频链路。高频链路然后接口到两个三相整流器配置在12脉冲通过高频开三角变压器安排。当变压器铁芯工作在高频工作时,表明所提出的配置工作在传统的线频12脉冲,从而产生高质量的输入电流和低THD。此外,还引入了移相调制来实现零电压切换和调节输出直流电压。该方法的另一个好处是能够通过对高频(20kHz)调制信号的简单占空比控制来调节输出直流电压/电流。由于5次和7次谐波的消除,整个三相输入电流具有高质量和接近统一的功率因数。提出的方法用高频变压器取代笨重的线频变压器,从而实现更高的功率密度。讨论了用于直流闭环设计的变换器小信号模型的推导。一个208v三相实验室样机证明了该概念的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Direct Three-Phase AC-DC Rectifier with High-Frequency Open-Delta Transformer and Closed Loop Output Voltage Regulation
This paper proposes a high current direct three-phase AC-DC rectifier with high-frequency transformer isolation configured as open-delta. The three-phase input voltages are modulated by two AC to AC converters to generate a high-frequency link at 20 kHz. The high-frequency link is then interfaced to two three phase rectifiers configured in 12-pulse by means of a high-frequency open-delta transformer arrangement. With the transformer core operating at high frequency operation, it is shown that the proposed configuration operates as a conventional line-frequency 12-pulse, resulting in high quality input currents with low THD. Furthermore, a phase shifted modulation is introduced to achieve zero voltage switching and to regulate the output DC voltage. An added benefit of the approach is the ability to regulate the output DC voltage/current by means of a simple duty cycle control of the high frequency (20kHz) modulating signal. The overall three-phase input currents are of high quality and near unity power factor due to the cancellation of 5th and 7th harmonics. The proposed approach substitutes the bulky line-frequency transformer with a high-frequency transformer, thereby achieving higher power density. Derivation of a small signal model of the converter is discussed for the design of DC closed loop. A 208 V 3-phase laboratory prototype demonstrates the validity of the concept.
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