三相双有源桥式直流变换器建模与控制方法

doi:10.19595/j.cnki.1000-6753.tces.L80758

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摘要作为一种隔离型双向直流变换器,三相双有源桥式（DAB）直流变换器具有电气隔离、高功率密度、宽电压传输范围和易于实现软开关等优点。该文对三相DAB变换器建模和控制方法进行了研究,针对现有的三相直流变换器建模方法精确度不高问题,提出基于二阶广义状态空间平均法的三相DAB模型,并且提出基于内点法的电流有效值优化调制策略,在此基础上提出优化限幅的闭环控制方法,从而改善系统的动态响应。最后,采用Matlab/Simulink和PLECS联合仿真证明所提模型的精确性,搭建了一个1.1kW的三相DAB直流变换器实验平台。实验结果表明,当输出电压指令v_2ref从60V突变至80V时,传统的闭环方法需要31ms恢复稳定,该文所提闭环控制方法18ms就可以重新达到稳定状态稳定运行,大大加快了系统的动态响应。

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	宋胜利
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关键词 ：三相双有源桥式直流变换器, 电流有效值优化调制策略, 广义状态空间平均法, 优化限幅环

Abstract：As a kind of isolated bidirectional DC converter, three-phase dual active bridge (DAB) DC converter has many advantages, such as electrical isolation, high power density, wide voltage transmission range and easy to realize soft switching. In this paper, the modeling and control methods of three-phase DAB converter are studied. To solve the problem of low accuracy of existing modeling methods for three-phase DC converter, a three-phase DAB model based on second-order generalized state space averaging method is proposed. In this paper, a current RMS optimal modulation strategy based on interior point method is proposed. On this basis, a closed-loop control method with optimal amplitude limitation is proposed to improve the dynamic response of the system. Finally, a 1.1kW three-phase DAB DC converter experimental platform is built by using the combined simulation of Matlab/Simulink and PLECS to verify the accuracy of the proposed model. When the output voltage instruction v_2ref changes from 60V to 80V, the traditional closed-loop method needs 31ms to restore stability. The closed-loop control method proposed in this paper can achieve stable operation in 18ms, which greatly accelerates the dynamic response of the system.

Key words： Three phase dual active bridge DC converter optimal modulation strategy for current RMS generalized state space averaging method optimized clipping ring

收稿日期: 2018-07-10 出版日期: 2020-01-02

PACS:

TM46

作者简介: 宋胜利男,1975年生,博士,主要从事特高压直流工程建设方面的管理工作。E-mail: songshengli1970@163.com;许景慧女,1995年生,硕士,研究方向为双有源桥式变流器的控制。E-mail: xjh000@stu.xjtu.edu.cn（通信作者）

引用本文:

宋胜利, 李卓强, 姚志, 陈东, 许景慧. 三相双有源桥式直流变换器建模与控制方法[J]. 电工技术学报, 2019, 34(zk2): 573-585. Song Shengli, Li Zhuoqiang, Yao Zhi, Chen Dong, Xu Jinghui. Modeling and Closed Loop Control of Three Phase Double Active Bridge DC Transformer. Transactions of China Electrotechnical Society, 2019, 34(zk2): 573-585.

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