Nonlinear Dynamics Reseach On Superbuck Converter Based On The Photovoltaic Power Generation Systems

Energy shortage and environmental pollution make the distributed solar photovoltaic power generation system received widespread attention; the study of power converter in this system has become a focus. Superbuck Converter is validation to be applied to solar power system, accompanied by increasing the efficiency of the whole system. The Superbuck converter was researched in-depth before, but the nonlinear dynamics research is still in the blank because of fourth-order system is difficult to have an accurate modeling and compute. In this pape nonlinear dynamic phenomenon of superbuck is as the research object, through theoretical analysis, numerical simulation and experiment research methods to find the terms of the stability of the converter system. In practical engineering application, we should be the reasonable design of circuit parameters, avoid system in the bifurcation and chaos unstable state. The concrete content includes:1. Introducing the basic dynamic characteristics of superbuck converter, gets the stability of the converter working point and stable working condition. And this paper introduces some common superbuck converter feedback control mode.2. Introducing the basic theory of nonlinear dynamics research, including stability theory, bifurcation theory and chaos theory.3. Deducing discrete-time mapping model and state space average model of superbuck converter.4. Calculating the fixed point of the system and change characteristics of jacobian matrix eigenvalue. Verify the accuracy of average state space modeling and the correctness of discrete-time mapping model.5. Getting bifurcation diagrams, time domain waveform diagram, phase diagram, poincare section, power spectrum of Superbuck converter by using numerical simulation...