High performance direct power control of three-phase PWM boost rectifier under different supply voltage conditions

Conventional direct power control (DPC) technique is a simple and efficient control strategy for three-phase PWM rectifier. However, its performance is deteriorated when the converter is supplied by unbalanced or distorted grid voltages. This paper presents the design and implementation of a new DPC scheme based on disturbance rejection principle to achieve sinusoidal input currents operation of three-phase PWM rectifier under different supply voltage conditions. In the proposed DPC, instantaneous active and reactive powers provided by harmonic component of input currents are chosen as controlled variables. Both controlled power reference are given from the outside of the controller and are set to zero to achieve full rejection of any grid disturbance. Moreover, the control strategy minimizes a cost function to select the optimum converter voltage vector allowing the best tracking of controlled powers. Finally, the effectiveness of the proposed DPC scheme is verified through several simulation and experimental tests. Results have proven an excellent performance and good robustness of the proposed DPC under different supply voltage conditions, compared to lookup table-based conventional DPC.