Power Converter Assisted Operation of Wind-Driven SEIG for DC Microgrid

A power electronic configuration and control scheme suitable for realisation of wind energy-fed DC microgrid is proposed. A self-excited induction generator is employed to harness the energy from wind with the addition of a pulse width modulated (PWM) rectifier. A space vector PWM (SVPWM) technique has been devised to operate the PWM rectifier for (i) maximum power point tracking (MPPT) (ii) reduced harmonic content in rectifier input current and (iii) unity power factor operation (UPF). The proposed control scheme continuously monitors the output current, which is the dc grid current for MPPT operation. The rectifier input voltages and currents are used for achieving the sinusoidal current shaping and UPF operation. The proposed system is simulated using Simscape toolbox in MATLAB/Simulink to assess the dynamic performance. The developed control scheme has been realized on a field programmable gate array (FPGA) controller (Xilinx Spartan-6 FPGA) and tested in the laboratory on an induction generator-rectifier prototype. The effective working of the system is verified for various operating conditions through both simulation and experimentation, and the results are presented in this paper.