Direct Power Control for three-phase power converters under distorted input voltages

Conventional Direct Power Control (DPC) technique is a simple and efficient control strategy for three-phase power synchronous rectifiers. However its performance is deteriorated when the power rectifier is working under distorted or unbalanced input voltages. In this paper the distorted input voltages operation of the system is under concern, and a model-based DPC for three-phase power converters is designed. The obtained expressions for the input control signal permit to design an adaptive control law which ensures the power reference tracking and the high performance operation of the power system. Besides, this adaptive control law minimizes the errors introduced by the parameters uncertainties as the smoothing inductor value, the grid frequency and the input voltage harmonic content. Controller design process and stability of the system are shown. Besides, the instantaneous power reference definition to achieve sinusoidal input currents are presented. Simulation results for a synchronous three-phase power rectifier prototype are shown to validate the proposed controller.