隔离型交-直流固态变压器前后级协调控制对比  

Comparison of Coordinated Control between Front and Rear Stages of Isolated AC-DC Solid-State Transformers

作　　者：郑征[1] 姜鹏飞 张国澎[1] 李子汉 ZHENG Zheng;JIANG Pengfei;ZHANG Guopeng;LI Zihan(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454003

出　　处：《电子科技》2022年第7期79-86,共8页Electronic Science and Technology

基　　金：河南省科技攻关项目(21202102210294);河南理工大学博士基金(B2015-32)。

摘　　要：隔离型交-直流固态变压器广泛采用双向变换器的前后多级级联结构。由于前后级控制带宽存在不同,导致两级传递功率存在不同。功率突变时,该差异会威胁此类SST的运行安全。针对此问题,文中分析了级间功率差异的产生机理,对各类减少级间功率波动的控制策略进行归纳整理,推导了不同策略下负载扰动对两级间电压的数学模型,利用MATLAB得到了各类典型控制策略的闭环波特图与时域下对应的阶跃响应,并横向对比了各类策略的优势与不足。仿真及实验结果证明了分析比较结果的正确性和有效性。Isolated AC-DC solid-state transformers widely use the front and rear multi-stage cascade structure of the bidirectional converter.Due to the difference in the control bandwidth of the front and rear stages,the transmission power of the two stages is different.When the power suddenly changes,the difference will seriously threaten the operational safety of this type of SST.In view of this problem,this study analyzes the mechanism of the power difference between the stages,summarizes various control strategies to reduce the power fluctuations between the stages,and derives the mathematical model of the load disturbance on the voltage between the two stages under different strategies.Using MATLAB,the closed-loop Bode plots of various typical control strategies and the corresponding step responses in the time domain are obtained,and the advantages and disadvantages of various strategies are compared horizontally.Finally,simulation and experiment results verify the correctness and validity of the analysis and comparison results.

关 键 词：固态变压器 双向变换器 控制带宽 级间功率差异 负载扰动 波特图 阶跃响应 横向对比 

分 类 号：TN7[电子电信—电路与系统] TN99