SPACE VECTOR-BASED ANALYTICAL ANALYSIS OF THE INPUT CURRENT DISTORTION OF A 3-PHASE DISCONTINUOUS-MODE BOOST RECTIFIER SYSTEM

In this paper the low frequency harmonic distortion of the mains current of a three-phase single-snitch discontinuous-mode boost-rectifier is calculated. The system analysis is based on application of space vector calculus and on substitution of discontinuous time shapes within a pulse period by quasicontinuous time shapes. The quasicontinuous time shapes are defined by averaging over the pulse period. The dependency of the shape of the input currents on the voltage transformation ratio is given for various control methods in analytical form. The results of the theoretical analysis are verified by digital simulation and by measurements on a laboratory model. A good consistency of the results has been found.