Journal of Shanghai Jiaotong University ›› 2019, Vol. 53 ›› Issue (3): 348-354.doi: 10.16183/j.cnki.jsjtu.2019.03.013

Previous Articles     Next Articles

Analysis on Hybrid Automata Model of Three-Phase Grid Inverter

LI Donghui,ZHENG Hongyu,YAO Lele   

  1. School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
  • Online:2019-03-28 Published:2019-03-28

Abstract: A new controller design method based on hybrid automaton model is proposed to solve the problem that grid current harmonics is large and the dynamic response time is long after the disturbance happens in the three-phase inverter, and a stability analysis method based on finite time stability is proposed on this basis. First of all, for a certain three-phase inverter, the state equations based on switching function are established. Then, on the basis of the working mode of the three-phase inverter, the hybrid automaton model is established from the angle of changing the switching range of the power frequency cycle and reducing the current harmonics. And the bus voltage is divided into 12 intervals to get the corresponding control rules. Finally, the stability analysis of the improved controller based on the hybrid automaton model is carried out according to the finite time stabilization method. The simulation results verify that the proposed automaton model and its controller can effectively reduce the harmonic distortion rate of the grid current to less than 0.56%. Furthermore, dynamic regulation time can be reduced when disturbance occurs.

Key words: current harmonics, hybrid automata model, controller, finite time stabi-lity, three-phase inverter

CLC Number: