Sliding mode direct power control of three-phase PWM boost rectifier using a single DC current sensor

This paper proposes a new control method for three-phase Pulse Width Modulation (PWM) boost rectifier using only one dc-link current sensor instead of two line current sensors. Single dc-link current sensor methods have critical problems with regard to the time spent for active voltage vectors application, which must be long enough to measure reliably the dc-link current during every switching interval. It is possible to solve this problem by the use of the proposed Direct Power Control (DPC) technique synthesized via sliding mode theory. The considered DPC control method computes the three phase grid line currents using the measured current from a single dc-link current sensor. The most important features of this method are simplicity and reliability. Also, it reduces the number of current sensors, weight and volume requirements. Simulation results demonstrate the feasibility and effectiveness of the proposed control method.