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Wind Power Impact on Power System Dynamic Part 5

Tham khảo tài liệu 'wind power impact on power system dynamic part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Doubly-fed Induction Generator Drives for Wind Power Plants 127 qs -qơs - 3_sls ơ _s ip -Ìr 82 s 2 2 According to 47 82 goes into qs - q -13 33 _siR 83 s 2 2 The first part of the equation 83 stands for the actual amount of reactive power involved in building up the mutual flux linkage T and according to 52 the magnetising reactive power can be written as follows 3_. . 3_. - qm - 2 3 _slR 2 3 j s mLL 84 The average magnetising power can then be written as 3 Qm 4XmĨR 85 The second part stands for the contribution of the rotor current vector towards magnetisation and if one defines it as in Vicatos Tegopoulos 1989 as the amount of reactive power being delivered to the air-gap qs 3 3 _sLR 86 the stator reactive power can be expressed as follows qs qơs qm qg 87 Analogously to the stator side the rotor reactive power is the imaginary part of the apparent power in the rotor terminals that contributes to building up the rotor flux linkage Tr qR 43 Ur R 13 RrIriR sXRrIriR -e RlR 88 On analysing equation 88 one notices that the first term is a real number whereas the second stands for the reactive power required for building up the rotor leakage flux Tor 23 ÍsXRẬrCr 89 The rotor average reactive leakage power is given by 3 sX K 90 inR 2 ƠR R The third term is similarly to the stator side in 83 a contribution of the rotor side to the machine magnetisation. Applying the induced voltage relation 54 and substituting the expression 86 yields 128 Wind Power qR q R 2 3 -zr-zR -s 13 esiR -sqg 91 From equations 87 and 91 the following relation between stator and rotor reactive powers can be found X Vr - iq R Vr - qƠR s qs - qơS - Vm s -q - q _q 92 It can be concluded that the reactive powers on the stator and rotor sides are related by the slip similarly to the active powers except by the reactive power required by the magnetisation. 3.3 The doubly fed induction generator One of the preferable solutions employed as wind turbine generator is the wound rotor induction machine with the