The Research Of Matrix Converter Based On Fuzzy Controls

Matrix converter is a direct frequency conversion devices, input voltage of any disturbance to affect the quality of its output waveform. At the same time, the output impedance of the filter pressure drop, load the disturbance also matrix converter output voltage waveform have an impact. In addition, since the device performance, the calculation error or disturbance, and other random effects, in the matrix converter in the output voltage and also have a harmonic component. Therefore, the matrix converter output voltage of the closed-loop control strategy study is of great significance.This article describes the theoretical basis for matrix converter, from the matrix transformation matrix converter start of the matrix converter circuit topology, that is, application of AC -DC - AC equivalent transformation method of the matrix converter into a rectifier-level and the inverter stage of two parts, is derived matrix converter and the equivalent AC - DC - AC converter switching function and the transformation matrix obtained matrix converter and the equivalent AC - DC - AC converter power switching function corresponding relationship between the.Papers on the matrix converter topology, double-space vector modulation strategy and its current converter strategy. In order to improve the matrix converter voltage power grids mutation, load fundamental changes in the robustness of the disturbance, a matrix converter control adaptive fuzzy closed-loop control strategy, the method will be a three-phase output voltage line static abc Coordinates to the two-phase rotating dq coordinate transformation (abc-dq) by dq coordinate system under the direct traffic, use of fuzzy control of a given output voltage d, q components tracking control. fuzzy controller use of the two fuzzy controller, the idea is to use its control in the control system emerged in all stages of the different characteristics of their implementation of different control strategies. Overcome the object of various parameters change or disturbance of the nonlinear uncertain impact on system performance, with robust and better static and dynamic performance; Papers with S functions and Simulink blocks were set up the matrix converter based on the classical PI closed-loop control system model and the matrix transformation based on fuzzy closed-loop control system model, simulation results verify the correctness of the proposed control strategy.