Design and Implementation Of Control Scheme for Wind Power Inverter

Abstract

One of the most important task of control strategy for wind turbine is to limit the power input to the turbine to that level that the mechanical and electrical components of the turbine are able to handle and also to extract maximum power from wind and transfer it to grid. In this project, power generated by wind is converted into DC by three phase uncontrolled rectifier and by using IBGT based inverter it is converted into AC, which is fed to grid through passive filter. The control strategy for firing inverter is based on hysteresis controller. As hysteresis controllers are intrinsically robust to system parameters, suitable for simple implementation and exhibit very high dynamic response. Here, hysteresis controller is formed by using comparator having two switches in positive feedback to vary hysteresis band. The harmonics at the inverter output are reduced by LCL filter. The designs of LCL filter are such that the current and voltage fed to grid are meeting the IEEE standard with unity power factor. In hardware implementation, the control card is designed for implementation of control scheme. The control card contains interfacing circuits of DSP TMS 320F28335. The printed circuit board designing of control card is done using software Circuit Creator. The testing of control card is to be carried out at lower rated module with motor load. Finally, hardware implementation of control scheme is done and the results are shown which match with the simulation results.