Current source dual-PWM frequency converter

Abstract

The present invention relates to the frequency converter technology field, especially to a current source dual-PWM frequency converter. The frequency converter constructs a switch time prediction model, and the switch time prediction model and an SVPWM modulation algorithm are combined to be applied to the current source frequency converter to realize inhibition of harmonic wave pollution of the current source frequency converter; an energy molding theory and a cooperation control technology are applied to the current source dual-PWM frequency converter to improve the control performance and break through the traditional theories and methods of the current source frequency converter at present. The current source dual-PWM frequency converter is low in power loss, minimized in harmonic wave, high in conversion efficiency, good in dynamic response performance and high in anti-interference capability, and constructs a current source dual-PWM frequency converter cooperation interconnection energy molding control theory framework to improve work efficiency, power factors and control performances of the dual-PWM frequency converter and reach control accuracy requirement so as to finally ensure work operation with high performances in a large-power and large-capacity application occasion, improve production quality and have high creativeness.

Description

technical field [0001] The invention relates to the technical field of frequency converters, in particular to a current source type double PWM frequency converter. Background technique [0002] Research status and development trends at home and abroad Analysis of development status and trends at home and abroad [0003] In recent years, the current source dual PWM frequency converter has the characteristics of four-quadrant operation capability, reliable short-circuit protection and high operation efficiency, so that it has significant advantages in high-power occasions, and related control technologies have become domestic and foreign. Research hotspots [5-14]. In its research and application, European and American countries have relatively mature technology, have certain advantages in performance and reliability, and are almost in a monopoly position. The representative ones are the Bulletin1557 series and PowerFlex7000 series current-type high-voltage high-power inverte...

AI Technical Summary

Problems solved by technology

However, most of the current schemes mainly adopt independent control for the PWM rectifier part and the inverter part in the dual PWM converter. Although the dynamic response speed of the grid side is unilaterally improved, the coordination of the entire system is not considered.

The rectifier and inverter buffer energy through DC reactors. If these two independent systems are directly connected, when a large disturbance occurs, the dynamic performance of the system will deteriorate

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