Abstract
The low harmonic content of the grid-side output power of the three-phase, three-level Vienna rectifiers makes them commonly used in hybrid AC-DC microgrids. However, the grid connected current performance of three-phase Vienna rectifier is highly dependent on the value of controller parameters. Unreasonable value often leads to grid side current distortion and poor system anti-interference. Firstly, the mathematical model of three-phase Vienna is established and analyzed, and a control strategy based on sliding mode variable structure control is designed to improve the dynamic and static performance of grid connected current, and the model is built and simulated in MATLAB simulation environment. The simulation results show that the control strategy designed in this paper can effectively ensure the dynamic and static performance of the output voltage and current of the three-phase Vienna rectifier, and has strong anti load disturbance ability.
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