Grid side converter controller of DFIG for wind power generation

With the advancement of technology, electricity generation using wind has drawn an increased attention in the world. As the amount of wind power integrated into the system is increased, it causes power quality and stability problems. Therefore power utilities are developing stringent grid codes which are to be satisfied by the wind power producers. Voltage control capability, reactive range capability, frequency control ability and fault ride through capability are among the major requirements stipulated in the grid codes. Due to the variable speed operation capability of Doubly Fed Induction Generators (DFIGs), they are becoming popular in wind power generation. The voltage control of the DFIG wind farm has been identified as the latest challenge with the present grid code requirements. This paper presents the design methodology of a stator side controller of the DFIG, which produces the terminal voltage control in addition to the DC link voltage regulation. The developed controller is simulated using PSCAD/EMTDC software to verify the performance of the controller. Further, a 60 MW typical wind farm is modeled in both PSCAD/EMTDC and IPSA+ and applicability of the above controller is justified.