一种三电平全桥直流变换器新型控制策略研究

发布时间：2018-02-28 06:21

本文关键词： 三电平变换器全桥变换器对称双移相谐波总畸变率软开关　出处：《中国电机工程学报》2014年33期 　论文类型：期刊论文

【摘要】：三电平全桥变换器的移相控制策略中,不能使所有开关管实现软开关条件;斩波加移相控制策略中,隔离变压器原边绕组电压谐波总畸变率(total harmonic distortion,THD)高。针对这一问题,提出一种新的对称双移相控制策略。将对称双移相控制策略与斩波加移相控制策略进行对比研究。通过对对称双移相控制策略下开关过程进行分析,得出所有开关管均能实现软开关条件;通过对变压器原边电压进行傅里叶分析,得出该控制策略下变压器原边绕组电压谐波总畸变率低。通过分析谐波总畸变率随斩控角的变化规律,得出该控制策略下变换器的最优稳态工作点。制作一台三电平全桥直流变换器科研样机,对该文的分析进行验证。
[Abstract]:In the phase shift control strategy of three-level full-bridge converter, the soft switching condition can not be realized for all switching transistors, and the total harmonic distortion rate of voltage harmonics in the primary side winding of isolation transformer is higher than that of total harmonic distortion in chopping plus phase-shifting control strategy. A new symmetrical double phase shift control strategy is proposed. The symmetrical double phase shift control strategy is compared with the chopped phase shift control strategy. The switching process under the symmetric double phase shift control strategy is analyzed. It is concluded that all switches can realize soft switching conditions, and the transformer primary voltage is analyzed by Fourier transform. It is concluded that the total harmonic distortion rate of transformer primary winding voltage is low under this control strategy, and the variation law of harmonic total distortion rate with chopping angle is analyzed. The optimal steady-state operating point of the converter is obtained under the control strategy. A three-level full-bridge DC / DC converter prototype is made and the analysis in this paper is verified.
【作者单位】：西安交通大学电气工程学院;海军工程大学舰船综合电力技术国防科技重点实验室;
【基金】：国家863高技术基金项目(2011AA040302) 新世纪优秀人才支持计划资助项目(NCET-11-0871)~~
【分类号】：TM46

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