Research Of The Grid-Connected Inverter For Wind Power System Based On DSP

In wind power generation system, the instability of wind energy determines the quality of the electricity generated by wind turbines volatile. And as all the performance indicators do not match the standard mains, it will not be able to make the feedback of electricity directly to the State Grid. In order to solve this problem, we need to add an energy inverter system based on power electronics technology between the wind turbines and the State Grid to ensure that the power quality after being transformed can get the performance parameters to match the State Grid.The paper begins with an overview of wind power’s present developmental situations as well as the future trends in domestic and foreign countries in this field. Then, it points out that the wind power inverter system is made up with three-phase energy transmission system including rectification, boost pressure and invertion. And it also makes an analysis of the typical voltage and current topological structure to determine the main circuit structure which is the three-phase full-bridge voltage inverter system’s topology structure, of the operating principle as well as the output performance in every aspect of the structure. Next, the paper lays special stress on the analysis of every level’s topology structure, working principle and control strategy of main circuit grid inverter when being transformed, focusing on detailed analysis of the Boost circuit and the introduction of PFC control strategy and the SVPWM control strategy based on the DC/AC transformation. On this basis, the relevant device parameters of transforming structure with every level are been deduced and formulated according to the designed energy inverter system’s expected performance indexes. Finally, combined with DSP, under the reference of the functional block diagram, the hardware circuit of the inverter system is designed and implemented. By using simulation software to simulate the inverse link of the SVPWM control, it receives expected voltage current waveform and performance indicators.This paper uses modular and structured method to design the inverter system, and introduces the software and phase lock loop technology to guarantee the accuracy of the phase and frequency modulation. By using MATLAB/Simulink to simulate the inverter part of control system, it gets the expected effect of the designed inverter system.