The Reseatch Of LLC Resonant Convertor Applied To Micro-distributed Wind Power System

The thesis based its background on the use of wind power, take the DC module applied in micro-distributed wind power system as the research object.According to the review of the development and application of DC/DC converter, contrapose the characteristics of micro-distributed wind power generation system, gives the design of LLC resonant converter as its DC module.Firstly through the analysis of the conditions that LLC resonant converter primary side switch to achieve soft switching, Presents a optimization method of LLC magnetizing inductance which can make LLC to achieve ZVS at full range and full load. Using simulation tools to complete the resonant inductance and capacitor design to optimize the converter efficiency. Gives the selection and design of key parameters, analyzed circuit losses, and produced a300VA full-bridge step-up LLC prototype to completed experiments.For LLC closed loop design, small signal analysis of LLC is essential, this paper use the extension describe function method to establish the LLC resonant small-signal model at the point of fully resonant, At last through comparative analysis and experiments verified the accuracy of the model.For the application of LLC resonant converter in the micro-distributed wind power system, This article gives the detailed design proposal which use the full-bridge doubling voltage LLC topology. Discussed the system DSP digital control strategy included MPPT control; Gives the system hardware and software protection solutions included the soft-start strategy and electronic braking system. And eventually based on wind power HUB project requirements produce a500VA prototype to validate the feasibility of system design.