Tham khảo tài liệu 'wind power impact on power system dynamic part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | An Analytical Analysis of a Wind Power Generation System Including Synchronous Generator with Permanent Magnets Active Rectifier and Voltage Source Inverter 57 frequency range a w min a rnw max is large enough with the generator current is much smaller than in the first mode but there is an increase in generator voltage. Phases of the fundamental harmonics of current and voltage of the generator do not coincide. In this mode the angle can be 0 pSG or pSG 0 . Vector diagram for the case pSG 0 is shown in fig. 5. Basic relations for the determination of voltages currents and power in the system are given in 14 26 . For these values of the angle pSG as in the case of pSG 0 the same value of power can be obtained in the two modes corresponding to different values of the parameter Mq . In the general case when q 0 kL 1 the active power If is related to Mq by the relation 2 V. ì T I2 I Pro - Po I u - U0 1 y YPRuP J y RuP 45 where . y- p _ ŨỈ tgPSG 0 2 Y2 p Whence 2 u U R 2 - f PRo - p0 i uqo1 2 U0 RuP I I y y Yp J uRo Y2PRo Mq1 2 2 V3 uqo1 2 Md 3 y2 Pro . Here the indices 1 and 2 correspond to the 1st and 2d modes in accordance with . Maximum power achievable at a given frequency of rotation a is defined by the relation Pro max p YpRp - 2. 46 Relationships 97 make possible to determine the dependence of the currents and voltages in the system as a function of frequency of rotation for different values of the angle pSG and the parameters q and kL. Major trends of these relationships can be seen on the graphs 22 25 . Let us consider the choice of mode of the system in WPI while we assume that q 0 kL 1 . In this case the equation 45 in polar coordinates will be p f w sec SG sin Psg PRo W Udo secpSG sin p PsG cosW 47 Uqo a secpSG sin PsG sllli m. shows the nature of the proposed change of the angle pSG of current shift i Go on voltage uGo and cos pSG on the frequency of rotation of the shaft of WT. The proposed 58 Wind Power Fig. 31. Fig. 32. An Analytical .
