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Fundamental and Advanced Topics in Wind Power Part 15

Tham khảo tài liệu 'fundamental and advanced topics in wind power part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Fuzzy Control of WT with DFIG for Integration into Micro-grids 409 AVrd . The AVrq or AVrd signals are added together in every simulation step in order to comprise the Vrq or Vrd value in p.u. according to an equation similar to equation 6 . The fuzzy variables of the Fc5a are expressed by the same linguistic variables as Fc3a.The membership functions of the input and the output are shown in Figs. 9 and 10 respectively. The 7 fuzzy rules of the Fc5a are the same as those of the Fc3a. Fig. 9. Membership functions of the input signal of Fc5a. - 1 - 0.8 - 0.6 - 0.4 - 0.2 0 0.2 0.4 0.6 0.8 Fig. 10. Membership functions of the output signal of Fc5a. Fc4a The input of this controller is the difference between the measured voltage at the generator output and the reference value Vref- Vmeas . The output of this controller is the variations of the d component of the reference value of the rotor current AIdrref. The reference value of the rotor current Idrref is formed as already mentioned The fuzzy variables of the Fc4a are already described. The membership functions of the input and the output are shown in Figs. 11 and 12 respectively. The 7 fuzzy rules of the Fc4a are the same as those of Fc3a. Fig. 11. Membership functions of the input signal of Fc4a. 410 Fundamental and Advanced Topics in Wind Power Fig. 12. Membership functions of the output signal of Fc4a. 4.2.2 Cgrid control As the stator resistance is considered to be small stator-flux orientation is the same with the stator voltage orientation. The applied vector control in this case is based on a synchronously rotating stator-flux oriented d-q reference frame which means that the d-axis is aligned with the vector of the grid voltage and the q component is zero. This control also regulates independently the active and reactive power according to the following equations 3 3 V Ps 21 ugdlgd ugqlgq 2 ugdlgd __ 3 3 7 Qs 2 ugqlgd ugdlgq _2ugdlgq The control configuration is shown in Fig.13. Two fuzzy controllers Fc were