Electronic Science and Technology ›› 2021, Vol. 34 ›› Issue (8): 79-86.doi: 10.16180/j.cnki.issn1007-7820.2021.08.013

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Research on Grid Connection of Photovoltaic Power Generation Systems Based on a New Robust Droop Control Method

YAN Zhenbin1,ZHENG Bochao1,2,ZHOU Zhiyong1   

  1. 1. School of Automation,Nanjing University of Information Science and Technology,Nanjing 210044,China
    2. Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology, Nanjing 210044,China
  • Received:2020-04-22 Online:2021-08-15 Published:2021-08-17
  • Supported by:
    National Natural Science Foundation of China(61973169)


Photovoltaic power generation system is easy to be affected by the environment and load changes, which will generate frequency and power fluctuations in the process of grid connection. The traditional PI control method is slow in response and poor in stability. To solve this problem, a new robust droop control design method is proposed in this study. An integral sliding mode controller is designed in the double closed-loop current inner loop control structure of bi-directional interconnected converter. The designed controller can not only suppress the voltage and frequency fluctuation of photovoltaic power generation system in the process of grid connection, but also ensure the stability of power system in different environmental conditions. The simulation results in MATLAB/Simulink show that the new robust droop control method is faster than the traditional PI control, and the fluctuation amplitude is reduced by nearly half, which ensures the continuous and stable operation of the grid after the photovoltaic power generation system is connected to the grid.

Key words: photovoltaic power generation, MPPT, perturbation and observation, AC/DC hybrid microgrid, bi-directional interconnected converter, droop control, sliding mode control, MATLAB simulation

CLC Number: 

  • TP273