Dynamical Study Of Peak-current-mode Controlled Synchronous Switching Z-source Converter

With the development of modern power electronics technology, people have the new requirements on the efficiency and reliability of the power converters. The traditional inverters, rectifiers, etc. brought a lot of shortcomings because of their own structure. For example, their low reliability make themselves easily susceptible to electromagnetic interference that causes the electronic swith incorrectly triggered, and then the device will be damaged. In addition, in order to meet voltage conversion requirements, it often requires a multi-stage design which not only increases the system cost, but also introduces more harmonic components. However, With the introduction of Z-source network,together with the switching devices,it forms a series of Z-source converter, such as Z-source inverter, Z-source rectifiers and others, and they can overcome the traditional inverters and rectifiers’ own shortcomings, such as low reliability, the limitation of the capability of the voltage’ lifting and lowering, etc., with good prospects. But, at the same time, Z-source converter, as a switching converter, belongs to strongly nonlinear- time-varying system, and the introduction of Z-source network has let it become a higher-orde system. In order to design good Z-source converter, we must conduct a detailed study of its non-linear characteristics, to guide our engineering design. In this paper, a simple Z-source converter- Peak-Current-Mode Controlled Synchronous Switching Z-Source Converter is for the research object, and for its nonlinear dynamics of behavior,we do the following works that make a certain contribution for the modeling and the dynamics behavioral research of such converters.1. Analysing the working principle and dynamic characteristics of the peak-current-mode controlled synchronous switching Z-source converter;2. Establishing a precise discrete iterative model for the peak-current-mode controlled synchronous switching Z-source converter;3. Calculating the fixed point of the system and change characteristics of jacobian matrix eigenvalue and analyzing the stability of the system.4. Getting the bifurcation diagrams and the Lyapunov exponent diagram by using numerical simulation, and analyzing the border collision bifurcation behavior of the system with obtaining the collision boundary line; By building in circuit simulation model of the converter in Matlab/Simulink, we get the time-domain simulation waveform and Poincare section diagram of the system, and show the dynamic behavior of the system evolution from a different side;5. Researching the statistical characteristics and entropy characteristics of the stable iterative sequence generated by discrete iterative map. From the perspective of information theory, analyzing the dynamic behavior of the system again;6. Sdutying the system by experiment, the experimental results show that: the theoretical modeling and simulation studying of the synchronous switch Z-source converter in this thesis are correct, fully consistent with the experimental results.