The Research On The Converter Of Two Megawatts Direct-driven Wind Power Generation Systems

Wind power converter system is the equipment which translate the wind generator output power into constant voltage constant-frequency power, is an important component part in the wind power system. Wind power converter system has the characteristic functions as follows: fast and dynamical adjusting the parameters, such as voltage, current, real power, reactive power and so on, improve the power factor, reduction of the grid harmonic pollution, is the current focus of the Wind power technology study. This paper analysis the direct-driven wind power generation's structure, working principle and key technologies, designed the converter of two megawatts direct-driven wind power generation systems.At first, this paper introduced the background and significance of the wind power converter technology, introduced the status of CSCF and VSCF wind power generation system, analysised the Principle of stall regulation and pitch regulation system. Then, details of the direct-driven wind power generation system's composition and working principle, in comparing the current converter circuit suitable for direct-driven wind power generation, this paper proposed one kind of variable current electric circuit topology which is based on IGBT's power grade nowadays. It is double PWM multistage paralleled electric circuit structure. And, circuital operating principle has carried out detailed analysis. Proposed use the direct power control method, according to its principle, established the PWM rectifier and PWM inverter model. And confirmed the control method accuracy through the Matlab/Simulink simulation.At last, the system hardware and software for 2 megawatts driving wind power generation converter is designed based on simulation. The paper in detail introduced the variable current system main circuit design, Including the IGBT shaping, electric capacity, inductance parameter computation, Introduced in detail develops the platform based on the TMS320F2812 hardware. Including the CUP unit, the voltage electric current sampling and the signal recuperation unit, the correspondence unit and the IGBT driving circuit's principle and the application electric circuit and so on, introduced the procedure flow chart for generator side and electrical network side, And introduced realizes the method based on the TMS320F2812 processor's SVPWM digit.