New direct power automatic control for rectifier stage of Marine power electronic transformer
In order to improve the power factor of the rectifier stage of ship power electronic transformers,enhance the performance of ship power systems,and ensure their normal operation,a new direct power automatic control method for ship power electronic transformer rectifier stage is proposed.Construct an equivalent circuit and mathematical model for ship PET rectifier stage,obtain the orthogonal virtual components of grid side voltage and current in a stationary coordinate sys-tem,and calculate the active and reactive components of ship PET rectifier stage based on the virtual components.A new dir-ect power control method based on sliding mode variable structure dual closed loop is proposed by combining the idea of dir-ect power control with the sliding mode variable principle.A power inner loop sliding mode controller and a voltage outer loop sliding mode controller are designed,and these two controllers are used to achieve automatic control of the rectifier stage of ship power electronic transformers.The experimental results show that this method can ensure the stable operation of the ship's power system and ensure the smooth output of the ship's PET voltage.
marine power electronic transformerdirect power controlrectifier stagesliding mode variable struc-ture
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