The control system design of doubly fed wind power inverter based on DSP

In this paper, a control system is discussed, which applies TMS320F28335, Altera new generation CPLD and highspeed precision A/D converter for simultaneously sampling voltage and current signals, calculating electric quantity in realtime. The vector control technology is used to control the DC voltage of the grid side rectifier and unity power factor. The control of voltage, current, frequency and phase of the rotor are completed. Furthermore, the constant frequency working of double-fed VSCF wind power generator is accomplished. SEMIKRON integrated power module is used as Power unit. PWM signals and fault protection signal are transferred by optical fiber to enhance the stability of the system. The system is tested on 30 kW test-bed, 1.5 MW full power test-bed. It is also working steadily in actual workplace. The results show that the control system can work well even when the wind speed varies greatly.