Control Scheme for Reducing Second Harmonic Current in AC-DC-AC Converter System

被引：17
|
作者：
Liu, Fei [1 ]
Ruan, Xinbo [1 ]
Huang, Xinze [1 ]
Qiu, Yang [1 ]
Jiang, Yuyang [1 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Ctr More Elect Aircraft Power Syst, Coll Automat Engn, Nanjing 211106, Peoples R China
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2022年 / 37卷 / 03期
基金：
美国国家科学基金会;
关键词：
Impedance; Rectifiers; Inverters; Voltage control; Capacitors; Harmonic analysis; Stress; AC-DC-AC converter system; input impedance; output impedance; second harmonic current (SHC); virtual impedance; CURRENT RIPPLE REDUCTION; LLC RESONANT CONVERTER; 2-STAGE INVERTER;
D O I：
10.1109/TPEL.2021.3109149
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In the ac-dc-ac converter system, the second harmonic current (SHC) is generated by the ac-dc rectifier and the dc-ac inverter. If the SHC propagates to the intermediate dc-dc converter, the current stress of the power switches will be increased, and the conversion efficiency will be degraded. Therefore, it is necessary to suppress the SHC in the dc-dc converter. In this article, the generation and propagation mechanism of the SHC in the ac-dc-ac converter system is analyzed. Then, from a perspective of control bandwidth and dc bus port impedance, the basic ideas for reducing the SHC in the dc-dc converter with different control targets are proposed. Based on that, the virtual-impedance-based control scheme is proposed to increase both the input impedance and output impedance of the dc-dc converter. In addition, the realization and design guideline of the virtual impedance is presented. Finally, a single-phase 3-kVA ac-dc-ac converter system is fabricated and tested in the lab. The experimental results are provided to verify the effectiveness of the proposed SHC reduction control scheme.
引用
收藏
页码：2593 / 2605
页数：13
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