共交流母线多端口变换器高频振荡特性分析  

Analysis of the high-frequency oscillation characteristics of a multi-port converter with an AC link

作　　者：魏树生 赵争鸣[1] 文武松[1] 李凯[2] 袁立强[1] 蔡伟谦 WEI Shusheng;ZHAO Zhengming;WEN Wusong;LI Kai;YUAN Liqiang;CAI Weiqian(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084 [2]北京交通大学电气工程学院,北京100044

出　　处：《清华大学学报（自然科学版）》2020年第9期751-762,共12页Journal of Tsinghua University(Science and Technology)

基　　金：国家重点研发计划项目(2017YFB0903203)。

摘　　要：在大容量多端口电力电子变换器中,基于模块化多有源桥(MMAB)的共交流母线拓扑具有端口隔离、模块化和损耗低的优点,近年来开始得到越来越多的关注。相对于直流母线,高频交流母线存在着固有的高频振荡。母线电压的振荡会增加变换器损耗,危害系统的安全运行,同时单个模块振荡会对其他互连的模块造成影响。该文以两模块单元组成的两种基本变换器为对象,研究了基于模块化多有源桥的共高频交流母线变换器中的振荡问题。利用频域分析,对系统振荡和高频变压器、电感和器件杂散电容等参数的关系进行了推导,给出了不控和受控2种模式下交流母线高频振荡的关键因素。最后,通过变换器在不同工作模式下以及2个模式间切换的实验,对上述结论进行了实验验证,为后续降低和消除高频母线振荡奠定了基础。High-frequency links based on modular multi-active bridges(MMAB)are useful for high power multi-port converters since they are modular,efficient and isolate the various ports.High-frequency AC buses have intrinsic oscillations that do not occur in DC buses which increase the converter losses and make the system less safe.Also,oscillations in one module affect the operations of other modules connected to the common AC bus.This study modeled two kinds of converters with each having two modules to study the effects of the high-frequency oscillations in the AC-link in an MMAB.The frequency domain analysis method was then used to investigate the relationship between the oscillations and the resonant tank parameters,including the stray parameters of the high-frequency transformer(HFT)and the stray capacitance of the switching devices.The results showed the key factors leading to the oscillations for both the uncontrolled mode and the controlled mode.Tests were conducted for the two modes and for switching between the two modes.The analytical results are verified by experimental data which would lay a foundation to reduce the oscillations in MMAB in the future.

关 键 词：共交流母线 多有源桥(MMAB) 高频振荡 杂散参数 

分 类 号：TM922.3[电气工程—电力电子与电力传动]