Electronic Science and Technology ›› 2021, Vol. 34 ›› Issue (11): 75-80.doi: 10.16180/j.cnki.issn1007-7820.2021.11.012

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Control Parameter Optimization of Cascaded H-Bridge Power Electronic Transformer

GAO Shang1,YAO Lei1,LI Yang2,LI Ruixin1   

  1. 1. School of Mechanical Engineering, University of Shanghai for Science and Technology,Shanghai 200093,China
    2. State Key Laboratory of Operation and Control of Renewabre Energy and Storage,China Electric Power Research Institute,Beijing 100192,China
  • Received:2020-07-15 Online:2021-11-15 Published:2021-11-16
  • Supported by:
    National Natural Science Foundation of China(51707121)


As an important part of distributed energy, PET has received widespread attention. Due to the existence of nonlinear components, the harmonic content of PET network side current is relatively high. In this study, CHB-PET based on the PR control is the research object, and the double closed-loop control strategy of voltage outer loop and current inner loop is adopted to optimize the parameters of CHB-PET. The simulation results show that changing the proportional coefficient and resonance coefficient of the PR controller will also change the harmonic content of the grid-side current. When the proportional coefficient remains unchanged and the resonance coefficient changes from 1 000 to 100, the harmonic content of the grid side decreases from 3.24% to 3.20%. Similarly, when the resonance coefficient remains unchanged and the proportional coefficient changes from 50 to 25, the harmonic content of grid side current decreases from 3.20% to 2.54%. The results show that compared with the resonance coefficient, the proportional coefficient is more sensitive to the harmonic content of the grid-side current.

Key words: cascaded-H bridge, power electronic transformer, double closed loop control, proportional coefficient, resonance coefficient, harmonic filtering, FFT analysis, total harmonic distortion

CLC Number: 

  • TN710.1