Design And Research On Power Converter Of Stand-alone Clean Energy Generation System

The stand-alone clean energy generation systems, for instance, the stand-alonephoto-voltaic generation system, the stand-alone wind power system, the wind-solar hybridpower system, the domestic biomass energy generation system, are with the characteristicsof small power capacity, the flexibility and practicality in use, easy popularization. Thefitness power systems, for running power system, are of brand-new conceptions and forms,which can also be grouped into the areas of the stand-alone clean energy generationsystems.Clean energy is in a compact relationship with the meteorological factors, for example,wind energy is the kinetic energy of air in motion on the near-surface layer, and solarenergy is radiant light and heat from the sun. Affected by the meteorological factors, suchas cloud layer and airflow, these energy properties are all with the characteristics ofintermittence and instability.Combined with the characteristics of clean energy, the stand-alone power convertersystem is designed. Based on the reliability and low cost, it is capable of energy storage andhigh-gain inverting, and can track the maximum power point to a certain extent.According to the requirements of clean energy generation systems and the principlesand characteristics of DC/DC topology and DC/AC topology, I make choice of the systemtopology scheme, which selects BUCK and Push-Pull as DC/DC converter, H-bridgetopology as a DC/AC link. Meanwhile, after the analysis of control strategy and modulationmethods, the power system control strategy implementation is developed.Relying on the external characteristics of the systems, hardware parameters in thevarious links are calculated and designed, then, the computer simulation study is done withthe proposed control strategy and modulation methods. After the production of multipleexperimental prototypes, we do lots of experiments using a variety of energy sources.Under the analysis of experimental waveforms and experimental data, the thesis promotesseveral solutions to improve the charging efficiency in energy storage. The dischargingefficiency in the different load and FFT harmonic analysis are researched as well.