The Bifurcation Study Of The DC/DC And DC/AC Basic Converter System

With the increasing demand of the energy consumption, clean energy generationbecomes more and more popular. The power converter which is based on the powerelectronic technology is the key element to the new energy system. As a typical nonlinearsystem, the modeling, analysis, and design of control method of power converter are alwaysbased on the linear model. However, in realistic application, the performance of systemstability may be reduced due to the nonlinearities such as the bifurcation and the chaoswhich are caused by the parameter variation or external disturbance. The development ofnonlinear dynamics makes it possible to analyze the nonlinear characteristics of powerconverter and to improve the system stability. Therefore， it has a scientific meaning andpractical value to study the bifurcation of power converter.Conventionally, the DC input converter mainly includes the DC/DC converter andDC/AC inverter. The current feedback control and one cycle control can be used foraccurate voltage modulation to deal with the nonlinearity of these converters. This paper isfocused on the bifurcation behaviors of DC input converters, such as voltage feedback buckconverters with one cycle control, current programmed buck-boost converters withdual-loop control and three phase inverters. The physical models of these converters arebuilt with the proper simplification, and the bifurcation theory is used to reveal the unstablemechanisms them. Besides, parameter boundaries are given for the purpose of engineeringdesigns based on on the simulations, experiments and the revealed mechanisms.