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浙江大学学报(工学版)  2022, Vol. 56 Issue (3): 622-630    DOI: 10.3785/j.issn.1008-973X.2022.03.022
电气工程     
隔离型交?直流固态变压器前后级一体化滑模控制
张国澎(),李子汉,王浩*(),郑征
河南理工大学 电气工程与自动化学院,河南 焦作 454000
Isolated AC-DC solid state transformer front and rear stages integrated sliding mode control
Guo-peng ZHANG(),Zi-han LI,Hao WANG*(),zheng ZHENG
School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
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摘要:

为了提高固态变压器(SST)控制系统的动态性能和鲁棒性,提出SST前后级一体化滑模控制方法. 根据SST前后级的非线性特性,建立整体仿射非线性的数学模型,采用输入?输出精确反馈线性化,实现前级电流环、前后级级间电压以及SST直流侧电压的解耦,加强前后两级功率传递的一致性. 将解耦的线性系统与积分滑模控制器结合,进一步提高系统整体动态性能,改善系统对参数摄动的鲁棒性. 仿真和实验结果表明,在外部发生扰动时,SST采用一体化滑模控制方法能够快速、有效地调整电网侧电压、两级间电压和直流侧电压的波动,改善前、后级功率传递的一致性,在发生参数变化时仍具有较强的鲁棒性.

关键词: 固态变压器前后级精确反馈线性化暂态性能一体化滑模控制    
Abstract:

An integrated sliding mode control method of front and rear stages of solid-state transformer (SST) was proposed, in order to improve the dynamic performance and robustness of SST control system. According to the nonlinear characteristics of the front and rear stages of SST, the mathematical model of overall affine nonlinearity was established. The input-output precise feedback linearization was used to decouple the front stage current loop, the voltage between the front and rear stages and the voltage on the DC side of SST. The consistency of the power transfer for the two converter stages was enhanced. The decoupling linear system was combined with the integral sliding mode controller to further improve the overall dynamic performance of the system and improve the robustness of the system to parameter perturbation. The simulation and experimental results show that in case of external disturbance, SST adopts the integrated sliding mode control method, which can quickly and effectively adjust the fluctuation of grid side voltage, two-stage voltage and DC side voltage, improve the consistency of power transmission between the two stages, and has strong robustness in case of parameter change.

Key words: solid-state transformer (SST)    converter stage    exact feedback linearization    transient performance    integrated sliding mode control
收稿日期: 2021-04-27 出版日期: 2022-03-29
CLC:  TM 46  
基金资助: 国家重点研发计划项目(2018YFC0604502);河南省科技攻关项目(202102210294);河南省自然科学基金资助项目(212300410147)
通讯作者: 王浩     E-mail: hpoyz@163.com;wangh@hpu.edu.cn
作者简介: 张国澎(1981—),男,副教授,从事大功率电力电子变换器方向的研究. orcid.org/0000-0003-2575-9438. E-mail: hpoyz@163.com
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引用本文:

张国澎,李子汉,王浩,郑征. 隔离型交?直流固态变压器前后级一体化滑模控制[J]. 浙江大学学报(工学版), 2022, 56(3): 622-630.

Guo-peng ZHANG,Zi-han LI,Hao WANG,zheng ZHENG. Isolated AC-DC solid state transformer front and rear stages integrated sliding mode control. Journal of ZheJiang University (Engineering Science), 2022, 56(3): 622-630.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.03.022        https://www.zjujournals.com/eng/CN/Y2022/V56/I3/622

图 1  隔离型交−直流SST拓扑
图 2  SST前后级一体化滑模控制框图
子系统 参数 数值
RS级 并网电压uab/V 380
并网电感L1/mH 2
级间电容C1/μf 2200
开关频率f1/kHz 5
级间电压参考值udc,ref/V 700
IBDC级 IBDC级电感L2/μH 20
直流侧电容C2/μF 1 500
IBDC开关频率f2/kHz 10
变压器变比n 1∶1
直流侧电压参考值uo/V 700
表 1  SST仿真参数
图 3  电源侧电压、电流波形
图 4  级间电压与负载侧电压波形
图 5  参数改变后级间电压和负载侧电压波形
图 6  SST整体实验平台结构图
图 7  SST整体实验平台
子系统 参数 数值
RS级 并网电感L1/mH 10
级间电容C1/μf 2 200
开关频率f1/kHz 5
IBDC级 IBDC级电感L2/μH 255
直流侧电容C2/μF 1 100
IBDC 开关频率f2/kHz 10
变压器变比n 1∶1
表 2  SST实验参数
图 8  传统控制电源侧a相电压、电流波形
图 9  一体化滑模控制电源侧a相电压、电流波形
图 10  传统控制级间电压和负载侧电压波形
图 11  一体化滑模控制级间电压和负载侧电压波形
图 12  参数改变后传统控制级间电压、负载侧电压波形
图 13  参数改变后一体化滑模控制级间电压、负载侧电压波形
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