Research On Control Technology Of Wind Power Grid Connected Inverter

As an important green clean energy,wind energy has been paid more and more attention.Wind power generation technology is becoming more and more mature in the unremitting efforts of generation after generation.However,improving the electric energy quality and power control of the wind power grid connected inverter is still the hot spot of the current research.The control technology of wind power grid connected inverter is primarily analyzed and discussed in this paper.Fuzzy PI control technology,neural network PI control technology and SVPWM control algorithm are mainly studied.The main contents is discussed as follow:First of all,The basic principle of wind power grid connected inverter is expounded,and the mathematical model of voltage source PWM inverter is built,and decoupling control of output active and reactive power of inverter is studied.Secondly,The voltage and current double closed-loop control strategy of inverter is studied,the outer ring with fuzzy PI controller,and the inner ring with neural network PI controller to replace the traditional PI controller,if the DC bus voltage disturbance,the controller can adjust PI parameters quickly and effectively,and control in real time,to ensure the stability of the inverter output active power.Thirdly,the traditional space voltage vector control is improved and the region subdivision of SVPWM control algorithm is proposed,increases the selection condition,change the original 6 sectors to 12 sectors,which will effectively reduce the switching loss of the inverter,and effectively decrease the harmonic influence in the switching process,and improve the grid connected electric energy quality.Fourthly,the control technology of single synchronous reference frame phase-locked loop is studied,positive phase sequence signal of grid voltage vector is processed and controlled,makes the phase-locked loop output phase angle and grid voltage vector signal synchronization,to ensure the real-time tracking of grid voltage vector phase angle signal,to realize the grid connected process smoothly.Fifthly,The hardware circuit of grid connected inverter based on TMS320F28035 is designed,including the device selection and parameter calculation of main circuit,and the schematic diagram design of signal sampling circuit,IPM drive circuit,detection and protection circuit.According to the research content in this paper,the simulation platform is built on the Matlab/Simulink software.The control method in this paper is simulated,compared with the simulate waveform of traditional control method,the results show that the control method in this paper is more effective,and the theoretical feasibility of this method is proved.