A novel stability analysis method for a cascade system of a three-phase voltage source PWM rectifier and LLC resonant converter

Abstract

A novel stability analysis method for a cascade system of a three-phase voltage source PWM rectifier and LLC resonant converter is provided. Based on the front-stage PWM rectifier output impedance model and a back-stage LLC resonant converter input impedance model of a cascade system and the impedance ratio stability criterion, the stability of the cascade system can be analyzed by combining theBode diagram and the Nyquist plot. The invention only needs to derive the output impedance of the front-stage converter and the input impedance of the back-stage converter, and can be used for judgingthe stability of the cascade system. This method avoids the drawback that the stability of cascade system can only be judged by simulation curve, and improves the accuracy of stability analysis of cascade system. The stability of the system can be intuitively seen from Bode diagram and Nyquist curve, and the influence of each parameter in the system on the system stability margin can be analyzed,so that the stability margin of the system can be improved.

Description

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AI Technical Summary

Benefits of technology

This patented technology helps learn about how influences impact the performance (output/input) of different types of converters such as AC power supply systems. By learning from these models, we are able to identify important characteristics like voltage drops across inductors, current flow through resistive elements, etc., making sure they work well even with varying environmental conditions over their lifespan. Overall, this technology improves efficiency and reliability for electronic devices while reducing costs associated therewith

Problems solved by technology

This patents describes how electrical devices like solar panels and wind turbines work together effectively without causing any issues such as fluctuations that could damage their performance. However, there's also potential risks when they connect wrongly due to factors like poor design practices or manufacturing variations. To address these concerns, various techniques were developed during research years aimed at developing stable standards and analyzings tools for power electronics converters (PEC).

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