Research On Grid Control Strategy For Permanent Magnet Synchronous Wind Power Generator System

As a new type of green energy, wind power generation technology becomes a new hotspot under the combined action of the gradual depletion of fossil energy and the concept of sustainable development. With the gradual increase of the proportion of wind power generation in the grid, the control requirements of wind power generation system is also gradually improve, so variable speed constant frequency (VSCF) wind power system become the most popular wind turbine type. Direct driven permanent magnet synchronous wind power generation (PMSWPG) system become the new direction of the recent development of wind power, because of its structure on the advantages and costs continue to decrease. In this background, take PMSWPG system grid side inverter as the main object of study, through math modeling, determine the control strategy, simulation modeling, low voltage ride through (LVRT) simulation research and control of experimental grid side inverter and other steps, study the grid control strategy of PMSWPG system.First, this paper introduce the development of wind power, then describes the different types of wind power generation systems and their characteristics. Discuss the advantages and disadvantages of two types of VSCF wind turbines, at last research focused on grid control strategy of PMSWPG system.Secondly, build a direct driven PMSWPG inverter math model, and then based on math model and control block diagram of grid side inverter, set up the MATLAB/Simulink simulation model. And through simulation study, verify the correctness of double closed loop control strategy.In addition, introduce the importance of LVRT capability for wind power generation system and some methods to achieve LVRT in the PMSWPG system. According to the characteristics of the different implementations of the LVRT methods, selected DC side Crowbar protection circuit control unloading resistance as the way to accomplish LVRT. And also build the simulations of two control methods of the Crowbar protection circuit in MATLAB/Sim(?)link, and then through the simulation studies, know both methods can achieve LVRT. Eventually, find the difference between two control methods by simulation under different grid voltage drop.Finally, build an experimental platform of PMSWPG use TMS320F28335as control core. Then do experiment research on the experimental platform to prove the control strategy of grid side inverter is right under the actual situation.