Abstract
The basic principle of three-phase PWM rectifier is analyzed and the mathematic model is established.Based on traditional voltage and current double feedback loops control structure, according to the balance of power relations between the input and output,feedforward compensation control of the grid voltage component is added in current loop,and feedforward compensation control of the load current is added in voltage loop.The design methods of current regulator and voltage regulator are given. This control strategy is effective to improve dynamic response of DC bus voltage when the load or grid voltage changes.Finally,simulation results show the effectiveness and correctness of the proposed control strategy.
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