Z-Source Inverter-Based Solar Photovoltaic Research

In solar energy, wind energy, fuel cells and other new clean energy power generation system, especially solar energy is the focus of future energy development,photovoltaic power generation is the trend of the development of solar photovoltaic, the inverter is one of the core part of photovoltaic power generation system, so the inverter is a very important link,traditional inverter generally have a current source and voltage source inverter, but these two inverter is in itself defects, current source inverter is the boost type, voltage source inverter is buck type. In order to obtain greater voltage of the inverter input side or smaller voltage,generally need to add additional conversion circuit, so the running efficiency of the whole system is greatly reduced. In addition, in these two kinds of inverter, In general, it appears EMI noise interference resulting in the bridge arm open (or direct) phenomenon, so the stability of the system will reduce, In order to avoid this phenomenon, generally the dead time will be added to, but it will cause the output current(or voltage) waveform distortion.This article is starting to analyze the limitations of traditional inverter topology, study on a new type of topological structure of the Z source inverter, it is not only to overcome the defects of the traditional inverter, also the introduction of the Z-source network inverter, the inverter apparatus has been the conventional inverter does not have the new features, such as bridge wall straight into the normal operating mode, straight-through zero state.first,the Z source network working principle is analyzed in detail, focus on mathematical modeling and control strategy of the Z-source inverter—SPWM and SVPWM, at the same time, switch current (or voltage) stress ofthe Z source inverter will also be researched, at the same time,in the discussion of the Z source inverter control system design methods and the main circuit, an experimental prototype will be built with dual-loop control method, the experimental results and simulation will also match.