张展,杨东.应用于PET的级联H桥直流侧电压平衡研究[J].电子测量技术,2016,39(4):4-8
应用于PET的级联H桥直流侧电压平衡研究
Study of DC side voltage balance of cascaded H bridge used in PET
  
DOI:
中文关键词:  电力电子变压器  级联H桥整流  直流电压平衡  调制波矢量重构  电压控制
英文关键词:power electronic transfoemer  cascaded H bridge rectifier  DC voltage balance  the modulation wave vector refactoring  voltage control
基金项目:
作者单位
张展 河南理工大学电气工程与自动化学院焦作454003 
杨东 河南理工大学电气工程与自动化学院焦作454003 
AuthorInstitution
Zhang Zhan School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003,China 
Yang Dong School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003,China 
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中文摘要:
      电力电子变压器(power electronic transfoemer,PET)的级联模块存在直流母线电压不平衡的问题,严重影响系统的稳定运行。本文针对电力电子变压器的级联H桥整流器直流侧电压的不平衡问题进行研究。首先,通过建立级联H桥整流器的数学模型,分析了各个级联H桥模块之间产生电压不平衡的原因,并提出了基于调制波矢量重构技术的电压功率平衡控制策略。然后,通过重构调制波矢量,实现直流侧电压平衡,保证了各H桥给定有功功率等量分配,使流经H桥的无功功率按需分配。最后,通过在MATLAB/Simulink环境下进行仿真,验证了本文方法的正确性和有效性。
英文摘要:
      The cascade module of power electronic transfoemer (PET)has the problem of DC side voltage unbalance, which affects the stable operation of the system seriously. For power electronic transfoemer, the problem of DC side voltage unbalance in the cascaded H bridge rectifier is studied in this paper. The mathematical model of cascaded H bridge rectifier is established, the reasons of voltage imbalance between cascaded H bridge modules are analyzed, and the control strategy of voltage power balance is put forward, based on the reconstruction technique about modulation wave vector. By reconstructing the modulation wave vector, the balance of DC side voltage is achieved. The equal distribution of active power toward each H bridge is ensured, which makes the reactive power flowing through the H bridge to be allocated according to the requirement. Finally, the correctness and effectiveness of the method is verified by simulation in MATLAB/Simulink environment.
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