Abstract:
The main aim of the project is to use an ac/dc/ac power converter to extract power from variable speed Permanent Magnet Synchronous generator (PMSG) and feed it to supply a standalone load. The output voltage and frequency of the PMSG is variable in nature due to non uniform wind velocities . In order to condition and feed it to a load we need power electronic interface. The variable three phase ac output at the PMSG is rectified by a diode rectifier and the dc link is maintained constant by a boost converter. The boost converter is provided with a closed loop feedback control, which is designed using PI controller. In this controller the output voltage is continuously sensed and duty ratio of the switch is varied to maintain the DC output voltage. The converter output is fed to 3 phase inverter which employs a sine PWM technique, the output of which can be fed to a load or grid. The inverter is incorporated with both real and reactive power control to match the grid or load specifications. The power converters and together with independent control systems can effectively improve the output voltage and frequency of the wind PMSG feeding an isolated load. The whole system is simulated using MATLAB/ Simulink and the results are shown. Hardware implementation of the system in open loop is done in the laboratory with a Wind turbine Emulator and inverter setup. The inverter pulses are generated in 120 deg and 180 deg mode with variable frequency using C2000 Piccolo launchpad evaluation kit.

Keywords: Permanent Magnet synchronous Generator(PMSG), PI controller, Closed loop boost converter, Closed loop inverter , Standalone load, C2000 launch pad evaluation kit