Title: Direct Power Control with Fixed Switching Frequency of Three-level Pulse Width Modulation Rectifier
Abstract: The mathematical model of the three-level voltage source PWM rectifier was presented,then based on the traditional direct power control and voltage oriented control,a new direct power control method with fixed switching frequency for the three-level neutral-point clamped voltage source PWM rectifier was proposed.The new method used closed-loop DC voltage control as outside control and closed-loop power control as internal control,and the decoupling control between active and reactive power during the dynamic course had been realized.Besides,space voltage pulse width modulation was used to make the switching frequency fixed which would simplify the design of filter.Simulation results showed that the neutral-point potential balance could be ensured,harmonic distortion of current was low,dynamic and steady performance were both well,unity power factor could be achieved.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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