Modulation strategy for single-phase high-frequency isolated direct AC-AC converter to eliminate voltage spike

被引：0
|
作者：
Wu F. [1 ]
Bu H. [1 ]
Zhang R. [1 ]
机构：
[1] School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2020年 / 40卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Direct AC-AC conversion; Electric converters; Isolated; Modulation strategy; Voltage spike;
D O I：
10.16081/j.epae.202009007
中图分类号：
学科分类号：
摘要：
Conventional modulation strategies for high-frequency isolated direct AC-AC converters generate voltage spikes, which may cause significant safety hazards. The essential reason that traditional phase-shift modulation strategy generates voltage spike is analyzed, i.e. the smooth transition from transformer current to output side inductor current can't be guaranteed. On this basis, a novel modulation strategy is proposed, in which the primary side uses pulse width modulation control and the secondary side uses power frequency synchronous control. In each switching cycle, the transformer current is equal to the output side inductor current before the transition from the freewheeling state to the power transmission state, so as to avoid the sudden change of current and completely eliminate the voltage spike. The detailed experimental results demonstrate the correctness and feasibility of the proposed modulation strategy. © 2020, Electric Power Automation Equipment Press. All right reserved.
引用
收藏
页码：169 / 174
页数：5
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