A 5 MW Wind Turbine Generator System for a DC grid application

Abstract: In this work a robust generating system for a 5 MW PMSM wind turbine systemwith diode rectifier and DC/DC converter connected to DC link has been investigated.The design and efficiency have been studied using MATLAB Simulink andSIMPLORER and the result shows that this system topology has high efficiency.The result found was that the same generator that can provide 5 MW using anIGBT-Converter, can only give 2.5 MW using a diode rectifier and a variable DClink.However, with series and parallel compensations the same generator can providean output power even more than 5 MW. It was also found that the efficienciesof systems at rated operation with IGBT-converter, diode rectifier with series compensationand shunt compensation are 97.6%, 98.6%, and 98.9%, respectively.Moreover, the systems efficiency at 5% of load are 93.0%, IGBT-converter, 97.3%,series compensation, and 95.3%, shunt compensation.The required reactive power for series compensation and shunt compensation toprovide 5 MW output power for the diode rectifier system, at rated operation, are1.5 MVar and 2.8 MVar, respectively.To conclude, the diode rectifier with series compensation is more efficient for lowwind speed (4-11m/s) also it needs less reactive power; however, the shunt compensationscenario has better efficiency at rated speed when the wind speed is higherthan 12m/s.