Control of nonlinear dynamic processes of three-phase regenerative converters with space-vector modulation

Abstract

A control system for nonlinear dynamic processes of threephase regenerative converters is considered. The system is built on the basis of the target-oriented control and allows to provide the desired dynamic mode without additional parametric synthesis. It eliminates the contradiction between the requirements for the switching frequency or the parameters of the transient process in the system and the requirements for the desired dynamic mode when the system parameters change over a wide range. A control system for nonlinear dynamic processes based on the method of directing to the purpose is proposed, that allows solving the specified problem. When implementing the system under consideration, it is assumed to evaluate the coordinates of fixed points of the desired mode based on measurements on a real control object with subsequent digital processing of the received signals in order to isolate the main harmonics. The simulation of the considered system and the efficiency of the proposed control system for nonlinear dynamic processes are performed. The proposed approach can be applied in other power conversion systems with low- frequency periodic impacts in conditions of lowfrequency distortion of the shape of currents or voltage as a result of bifurcations.